Emerson 1098H-EGRs, 1098-EGR Data Sheet

Bulletin 71.2:1098-EGR

Types 1098-EGR and 1098H-EGR Pressure
Reducing Regulators

•   Differential as low as 

1 psi / 70 mbar

•   Quick Change 
Trim Package

•   Materials of Construction 
Compatible with Below

Grade Installations

• In-Service Travel

Inspection

February 2015

•   No Atmospheric 

Bleed

W6956

•   Optional Noise 

Abatement Trim
(Up to 30dBA reduction)

•   Easy Top Entry In-Line 

Maintenance

•   NPS 1 through 12 x 6 / 
DN 25 through 
300 x 150 Body Sizes

Available

•   Aqueous 

Trim Packages 
(Application Specic)

•   Stainless Steel Construction 
for Corrosive Environments 
and Oxygen Service

www.fisherregulators.com

D100143X012

Bulletin 71.2:1098-EGR

Specications

The Specications section lists pressure limitations and other specications for various Types 1098-EGR and 
1098H-EGR constructions. Specications for a given regulator as it originally comes from the factory are stamped 
on nameplates located on both the actuator and main valve body, while the pilot control spring range is displayed 
on the pilot spring case and the pilot restriction code is stamped on the pilot body (S = standard gain, L = low 
gain and H = high gain).

Body Sizes and End Connection Styles

See Table 1

Main Valve Maximum Inlet Pressure

(1)

400 psig / 27.6 bar or body rating limit

whichever is lower

Maximum Pilot Supply Pressure

(1)(2)

600 psig / 41.4 bar

Outlet Pressure Ranges

See Table 2

Maximum and Minimum Differential Pressures

See Table 4

Actuator Sizes and Maximum Pressures

See Table 3

Supply Pressure Settings Required for the 
Type 95H Regulator

See Table 5

Pressure Registration

External

Temperature Capabilities

(1)

Nitrile (NBR): -20 to 180°F / -29 to 82°C
Fluorocarbon (FKM): 0 to 300°F / -18 to 149°C,
except water is limited to 0 to 200°F / -18 to 93°C

Ethylenepropylene (EPR): 

-20 to 275°F / -29 to 135°C

Options

•  NACE Construction

  •  Monitor Conguration

  •  Boiler Fuel Construction

 • Aqueous (Liquid) Service Construction

  •  Noise Abatement Trim

Port Diameters and Travels

BODY SIZE

NPS DN In. mm In. mm

1 25 1-5/16 33.3 3/4 19 - - - - - - - - - - - -

2 50 2-3/8 60.3 1-1/8 29

3 80 3-3/8 85.7 1-1/2 38 40 7/8 22

4 100 4-3/8 111

6 150

200 x

8 x 6

150 and

and

300 x

12 x 6

150

PORT 

DIAMETER

7-3/16 183

Standard Restricted

2 51

TRAVEL

Percentage of 
Flow Capacity

30 3/8 9.5

70 5/8 16

40 1 25

- - - - - - - -

In. mm

Construction Materials

Main Valve

Body and Body Flange: Cast iron,

WCC Steel, CF8M Stainless steel   
Cage: CF8M Stainless steel (Linear),
    416 or 316 Stainless steel (Whisper Trim™) or    
    hardened ENC coated Cast iron (Quick Opening)

Seat Ring and Valve Plug: Hardened 416 Stainless
steel or 316 Stainless steel
Travel Indicator Assembly: Steel or Stainless steel

except plastic for indicator scale
Piston Ring: Polytetrauoroethylene (PTFE)
O-rings and Soft Parts: Nitrile (NBR) (standard),

    Fluorocarbon (FKM) or Ethylenepropylene (EPR) 

Spring: Steel or Inconel® X-750
Bolting: Steel, Stainless steel

1. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.

2. For stability or overpressure protection, a reducing regulator may be installed upstream of the pilot according to the Installation section.

- continued -

Inconel® is a mark owned by Special Metals Corporation.

2

Specications (continued)

Bulletin 71.2:1098-EGR

Construction Materials (continued)

Actuator

Bonnet: Zinc-plated Steel or 304 Stainless steel
Diaphragm Case: Steel or Stainless steel
Bolting: Steel, Stainless steel
Diaphragm Plate: Cast iron,

316 or WCC Stainless steel

Stem Guide: Stainless steel
Diaphragm and O-rings: Nitrile (NBR) (standard),

    Fluorocarbon (FKM), Ethylenepropylene (EPDM)

Stem: 17-4 PH Stainless steel (standard) or
316 Stainless steel

Pilot Mounting Parts

Tubing and Connector Fittings: Steel (standard)
or Stainless steel
Pipe Bushing: Malleable iron, Stainless steel
Pipe Nipples: Galvanized steel, Stainless steel

  Type 6351 Pilot

Body, Body Plug and Spring Case: Aluminum

Valve Plug Stem: Brass (standard) or Stainless steel
Diaphragm, O-rings and Gaskets: Nitrile (NBR) 
(standard) or Fluorocarbon (FKM)

Type 6352, 6353, 6354L, 6354M or 6354H Pilot

Body, Body Plug, Spring Case and Closing Cap:

Aluminum (standard) or Stainless steel
Diaphragm: Nitrile (NBR), Fluorocarbon (FKM)

    or Ethylenepropylene (EPR)

Types 6354M and 6354H Diaphragm
Limiter: Aluminum

O-rings and Soft Parts: Nitrile (NBR) (standard) or
    Fluorocarbon (FKM)

Filter: Brass (Type P594-1 standard) or Aluminum 
    (Type P593-1), except cellulose for lter element

61 Series Pilots
Body and Spring Case: Cast iron

Upper and Lower Diaphragm:

Nitrile (NBR), 

    Neoprene (CR) or Fluorocarbon (FKM)  

Composition Seats: Nitrile (NBR) or 

    Fluorocarbon (FKM)

O-rings: Nitrile (NBR) or Fluorocarbon (FKM)

Type Y600AM Pilot
Body, Spring Case and Lower Casing: Cast Iron

Diaphragm: Nitrile (NBR)
Composition Seats: Nitrile (NBR)   
Trim: Aluminum

Pilot and Actuator Vents
Type Y602 vent assembly

Approximate Weights (With Standard Single­Pilot Construction)

Type 1098 Actuator

Size 30
NPS 1 / DN 25 Body: 55 lbs / 25 kg

NPS 2 / DN 50 Body: 75 lbs / 34 kg
NPS 3 / DN 80 Body: 115 lbs / 52 kg
NPS 4 / DN 100 Body: 165 lbs / 75 kg
NPS 6 / DN 150 Body: 350 lbs / 159 kg
NPS 8 x 6 / DN 200 x 150 Body: 625 lbs / 284 kg
NPS 12 x 6 / DN 300 x 150 Body: 1102 lbs / 500 kg

      Size 40 (Standard)

NPS 1 / DN 25 Body: 65 lbs / 29 kg
NPS 2 / DN 50 Body: 85 lbs / 39 kg
NPS 3 / DN 80 Body: 125 lbs / 57 kg
NPS 4 / DN 100 Body: 175 lbs / 79 kg
NPS 6 / DN 150 Body: 360 lbs / 163 kg
NPS 8 x 6 / DN 200 x 150 Body: 635 lbs / 288 kg
NPS 12 x 6 / DN 300 x 150 Body: 1112

lbs

 / 504 kg

Size 70
NPS 1 / DN 25 Body: 140 lbs / 64 kg

NPS 2 / DN 50 Body: 160 lbs / 73 kg
NPS 3 / DN 80 Body: 200 lbs / 91 kg
NPS 4 / DN 100 Body: 250 lbs / 113 kg
NPS 6 / DN 150 Body: 435 lbs / 197 kg
NPS 8 x 6 / DN 200 x 150 Body: 710 lbs / 322 kg
NPS 12 x 6 / DN 300 x 150 Body: 1187

lbs

 / 538 kg

Type 1098H Size 30 Actuator
NPS 1 / DN 25 Body: 80 lbs / 36 kg

NPS 2 / DN 50 Body: 100 lbs / 45 kg
NPS 3 / DN 80 Body: 140 lbs / 64 kg
NPS 4 / DN 100 Body: 190 lbs / 86 kg
NPS 6 / DN 150 Body: 375 lbs / 170 kg
NPS 8 x 6 / DN 200 x 150 Body: 650 lbs / 295 kg
NPS 12 x 6 / DN 300 x 150 Body: 1127

lbs

 / 511 kg

Table 1. Body Sizes and End Connection Styles

BODY SIZE

NPS DN

1 or 2 25 or 50 NPT, CL125 FF or CL250 RF NPT, CL150 RF, CL300 RF, CL600 RF, BWE, SWE or PN 16/25/40

3, 4 or 6 80, 100 or 150 CL125 FF or CL250 RF CL150 RF, CL300 RF, CL600 RF, BWE or PN 16/25/40

8 x 6 or 12 x 6 200 x 150 or 300 x 150 - - - - CL150 RF, CL300 RF, CL600 RF or BWE

CAST IRON STEEL OR STAINLESS STEEL

3

Bulletin 71.2:1098-EGR

A6563

INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE

Figure 2. Operational Schematics

Introduction

TYPE 6351

TYPES 6352,
6353, 6354

TYPE 1098-EGR WITH 6350 SERIES PILOT

Principle of Operation

TYPE 1098-EGR

The Types 1098-EGR and 1098H-EGR regulators provide 
economical and accurate pressure control in a wide variety 
of applications: natural gas distribution systems; fuel gas 
supply to industrial boilers, furnaces, ovens and mixers; 
and large commercial/industrial establishments such as 
shopping centers and schools. They are also used in plant 
air service and in liquid service where a slow stroking 
time (approximately 30 to 90 seconds) is desired on both

opening and closing the main valve.

The superior performance of this regulator is due to the 
amplifying effect of the pilot and the two-path control 
system. Changes in outlet pressure act quickly on 
the actuator diaphragm to provide fast response to 
system changes. Then, the pilot amplies any small 
system changes to position the main valve for precise 
pressure control.

Bubble-tight shutoff is achieved utilizing knife-edged seats 
in the valve plug. When the regulator is in the closed 
position, the knife-edged seats make a gas-tight seal 
against the upper and lower (port) valve seal. A variety of 
cages are offered for standard, speed of response and 
noise applications. The cage-guided metal plug provides 
superior control and stability.

The pilot-operated Types 1098-EGR and 1098H-EGR 
regulators both use inlet pressure as the operating 
medium, which is reduced through pilot operation to load 
the actuator diaphragm. Outlet or downstream pressure 
opposes loading pressure in the actuator and also 
opposes the pilot control spring. The Type 1098-EGR 
regulator operation schematic is shown in Figure 2.

In operation, assume that outlet pressure is below 
the pilot control setting. Control spring force on the 
pilot diaphragm thus opens the pilot valve plug, 
providing additional loading pressure to the actuator 
diaphragm. This loading pressure

forces the actuator 
stem upward, opening the main valve plug via a bump 
connection. The upward motion of the plug allows gas 
to ow through the cage into the

downstream system.

When downstream demand has been satised, outlet 
pressure tends to increase, acting on the pilot and 
actuator diaphragms. This pressure exceeds the pilot

control spring setting, moving the pilot diaphragm away

and letting the valve plug spring (Type 6351, 61 Series 
or Type Y600AM pilots) or bellows (Types 6352 through 
6354M pilots) close the pilot valve plug (unbalanced in 
the Type 6351 or 61 Series pilots but balanced in the 
Types 6352 through 6354M pilots). Excess loading

4

Bulletin 71.2:1098-EGR

TYPE 1098-EGR

TYPE 1806

A6641

INLET PRESSURE
OUTLET PRESSURE

LOADING PRESSURE
ATMOSPHERIC PRESSURE

TYPE 61LD

TYPE 1098-EGR WITH TYPE 61LD PILOT AND TYPE 1806 RELIEF VALVE

TYPE 1098-EGR

TYPE 95H

OPTIONAL:

TYPE 112 RESTRICTOR

TYPE Y600AM

M1008

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
PILOT SUPPLY PRESSURE

TYPE 1098-EGR WITH TYPE Y600AM PILOT AND TYPE 95H PRESSURE SUPPLY REGULATOR

Figure 2. Operational Schematics (continued)

FIXED RESTRICTOR

5

Bulletin 71.2:1098-EGR

pressure on the actuator diaphragm escapes downstream 
through the bleed hole (Type 6351 pilot), bleed orice 
(61 Series pilot), restriction (Types 6352 through 
6354M pilots) or xed restrictor (Type Y600AM pilot).

Reduced actuator loading pressure permits the main 
valve to close. The combination of main valve spring 
force and valve plug unbalance provides positive valve 
plug shutoff against the port and upper seals.

To protect the Type 1098 or 1098H actuator diaphragm 
from excessive differential pressure, the 6300 Series 
pilots have a relief valve that allows loading pressure

to bleed downstream at approximately 25 psig / 1.7 bar

differential across the actuator diaphragm. 
relief valve (Type 1806) is required when differential 
is higher than 25 psid / 1.7 bar d or when using the 
61 Series or Y600AM pilots.

An external 

Installation

On the Type EGR main valve, normal pressure drop 
assists shutoff. Therefore, leakage may result during 
any reverse pressure drop condition. The regulator 
may be installed in any position. The normal mounting 
position is with the pilot mounted to the right of the 
main valve when looking downstream; however, the 
pilot may be moved to the left side. Control and supply 
lines necessary for installation are not supplied with 
the regulator.

In some cases, good piping practice will require that 
outlet piping be swaged up above the body size to 
prevent excessive pressure drop along the outlet line. 
The piping should be as close to the regulator outlet 
size as possible.

Construction Features

The Y600AM and 61 Series pilots provide the 
option for low setpoints and improved accuracy. The 
61 Series pilot is available in a variety of congurations 
to meet your specic application needs – Type 61L 
low pressure pilot, Type 61LE low pressure, wide 
proportional band pilot, Type 61LD low pressure,

narrow proportional band pilot and the Type 61H

high pressure pilot. These pilots can be congured to 
maximize the performance under various application

scenarios. For instance, the 61 Series pilots are

available for fast closing, fast opening or monitor 
applications. Refer to Bulletin 71.8:61 for specics.

Boiler Fuel Pressure Control

To enhance proper operation and adequate 
response to negative pressure shock condition in low 
differential pressure boiler fuel control applications, 
use the Type 1098-EGR boiler fuel conguration: 
Type 1098-EGR with Yellow Main Spring, Quick 
Opening Cage, Type 6352 pilot, Size 70 Actuator and 
Type Y600AM or 627M Auxiliary Pilot mounted in

parallel with the Type 6352 pilot.

To provide faster response, two pilots mounted 
in parallel sense the downstream pressure. The

Type 6352 pilot is the primary controlling pilot and the

Type Y600AM or 627M auxiliary pilot stands by until 
it senses a negative pressure shock condition. The 
auxiliary pilot opens, allowing additional ow into the 
actuator, increasing the stroking speed and providing 
faster response. See Figure 5 for schematic.

The quick opening cage allows maximum capacity at 
shorter travels to decrease stroking time in opening 
and closing directions. The Yellow Main Spring 
requires that service conditions not exceed 20 psig /

1.4 bar maximum inlet pressure and 10 psi / 0.69 bar 
maximum differential pressure.

Pilots for Application Versatility

The balanced valve plug in the Types 6352, 6353 
and 6354 pilots provides fast closing action when 
quick response is required and also minimizes outlet 
pressure changes due to varying supply pressures. 
A tapped spring case with gasketed closing cap is 
standard for remote venting or for pressure loading 
applications involving differential pressure control 
or remote pneumatic adjustment of the downstream 
pressure setting.

6

Supply the boiler pilot light gas with the Type 1098-EGR. 
The pilot light gas supply line should branch off the main 
fuel line downstream of the Type 1098-EGR and include 
a separate regulator to control the 
pressure, if required (see Figures 5 and 6)
the Type 1098-EGR to have its main valve plug just off 
the seat waiting for the sudden negative shock created

when the boiler solenoid valve is opened to light the

boiler to the high re load. This conguration signicantly 
increases the stroking speed of the Type 1098-EGR.

nal pilot light gas 

. This allows

Table 2. Outlet Pressure Ranges

PILOT TYPE

6351

6352

6353

(1)

6354L

(2)

6354M

(2)

6354H

61L
61LD
61LE

61H 10 to 65 0.7 to 4.5 Green Stripe 0Y066427022

61HP

Y600AM

1. Without diaphragm limiter.

2. With diaphragm limiter.

14 in. w.c. to 2 psig

7 in. w.c. to 2 psig

15 in. w.c. to 1.2 psig

Bulletin 71.2:1098-EGR

OUTLET (CONTROL) PRESSURE RANGE

psig bar

3 to 20
5 to 35

35 to 100

2 to 10
3 to 40

35 to 125

85 to 200 5.9 to 13.8 Blue 1L346127142
175 to 220 12.1 to 15.2 Blue 1L346127142
200 to 300 13.8 to 20.7 Green 15A9258X012

1 to 5
2 to 10
5 to 15

10 to 20

15 to 45

35 to 100

100 to 300

4 to 8 in. w.c.

7 to 16 in. w.c.

1.2 to 2.5

2.5 to 4.5

4.5 to 7

0.2 to 1.4

0.3 to 2.4

2.4 to 6.9

35 mbar to 0.1 bar

0.1 to 0.7

0.2 to 2.8

2.4 to 8.6

17 mbar to 0.1 bar

0.07 to 0.3

0.1 to 0.7

0.3 to 1.0

0.7 to 1.4

1.0 to 3.1

2.4 to 6.9

6.9 to 20.7

10 to 20 mbar

17 to 4 mbar

37 mbar to 0.08 bar

0.08 to 0.17

0.17 to 0.31

0.31 to 0.48

SPRING COLOR SPRING PART NUMBER

Green

Unpainted

Red

Yellow

Black

Yellow

Red

Red 

Yellow

Blue
Brown
Green

Yellow

Blue

Red

Red

Unpainted

Yellow

Green

Light Blue

Black

1B986027212
1B788327022
1K748527202

14A9672X012
14A9673X012

1E392527022

1K748527202

1B886327022

1J857827022

1B886427022

1J857927142

1B886527022

1E392527022

1D387227022
1D465127142

1B653827052
1B653927022
1B537027052
1B537127022
1B537227022
1B537327052

Table 3. Actuator Sizes and Maximum Pressures

ACTUATOR TYPE ACTUATOR SIZE

1098

1098H 30 350 24.1 400 27.6

30

40 (standard)

70

OUTLET CONTROL PRESSURE EMERGENCY CASING PRESSURE

psig bar psig bar

100

75
50

6.9

5.2

3.4

115

82
65

7.9

5.6

4.5

Table 4. Maximum and Minimum Differential Pressures for Main Valve Selection

BODY SIZE

NPS DN psig bar psig bar psig bar psig bar

1 25

2 50

3 80

4 100

6, 8 x 6

and 12 x 6

1. Maximum inlet pressure is equal to set pressure plus maximum differential.

2. Requires special 6300 Series pilot construction without integral relief valve and with external Type 1806 40 psid / 2.8 bar d relief valve.

3. Should not exceed the body rating limit. Use this pressure value or the body rating limit, whichever is lower.

150, 200 x 150

and 300 x 150

SPRING PART 

NUMBER

14A9687X012   Green 60 4.1 3.5 0.24 2.5 0.17 1 0.07
14A9680X012   Blue 125 8.6 5 0.34 3 0.21 1.5 0.10
14A9679X012   Red 400
14A6768X012   Yellow 20 1.4 - - - - - - - - 2 0.14 1 0.07
14A6626X012   Green 60 4.1 4 0.28 3 0.21 1.5 0.10
14A6627X012   Blue 125 8.6 6 0.41 5 0.34 2 0.14
14A6628X012   Red 400
14A6771X012   Yellow 20 1.4 - - - - - - - - 2.5 0.17 1 0.07
14A6629X012   Green 60 4.1 5 0.34 4 0.28 2 0.14
14A6630X012   Blue 125 8.6 8 0.55 6 0.41 2.5 0.17
14A6631X012   Red 400
14A6770X012   Yellow 20 1.4 - - - - - - - - 3.5 0.25 1.3 0.09
14A6632X012   Green 60 4.1 10 0.69 5 0.34 2.5 0.17
14A6633X012   Blue 125 8.6 13 0.90 8 0.55 3 0.21
14A6634X012   Red 400
15A2253X012   Yellow 20 1.4 - - - - - - - - 6 0.42 2.2 0.15
14A9686X012   Green 60 4.1 13 0.90 9.5 0.66 4 0.28
14A9685X012   Blue 125 8.6 19 1.3 14 0.97 6 0.41
15A2615X012   Red 400

SPRING 

COLOR

MAXIMUM ALLOWABLE 

DIFFERENTIAL PRESSURE

(3)

27.6

(3)

(3)

(3)

(3)

27.6

27.6

27.6

27.6

(1)

Size 30 Actuator Size 40 Actuator Size 70 Actuator

(3)

(3)

(3)

(3)

(3)

7 0.48 5 0.34 2.5 0.17

11 0.76 10 0.69 3 0.21

14 0.97 11 0.76 4 0.28

22 1.5 13 0.90 5 0.34

(2)

28

MINIMUM DIFFERENTIAL PRESSURE 

REQUIRED FOR FULL STROKE

1.9 19 1.3 8 0.55

7

Bulletin 71.2:1098-EGR

Table 5. Supply Pressure Settings Required for the Type 95H Regulator

BODY SIZE

NPS DN

1 25

2 50

3 80

4 100

6 or 8 x 6

1. The pressures shown in the table are the minimum supply pressures required by the pilot. If the inlet pressure is less than shown, an external pilot supply is necessary.

150 or

200 x 150

TYPE EGR

SPRING COLOR

Green

Blue
Red

Green

Blue
Red

Green

Blue
Red

Green

Blue
Red

Green

Blue
Red

Red Unpainted Yellow Green Light Blue Black

psig bar psig bar psig bar psig bar psig bar psig bar

6

0.41

7

0.48

8

0.55

6

0.41

8

0.55

13

0.90

7

0.48

9

0.62

14

0.97

8

0.55

11

0.76

16

1.1

13

0.90

17

1.2

22

1.5

6

0.41

7

0.48

8

0.55

6

0.41

8

0.55

13

0.90

7

0.48

9

0.62

14

0.97

8

0.55

11

0.76

16

1.1

13

0.90

17

1.2

22

1.5

SUPPLY PRESSURE

Type Y600AM Spring Color

7

0.48

8

0.55

9

0.62

7

0.48

9

0.62

14

0.97

8

0.55

10

0.69

15

1.0

9

0.62

12

0.83

17

1.2

14

0.97

18

1.2

23

1.6

8
10
11

9
11
16

10
12
17

11
14
19

15
20
25

0.55

0.69

0.76

0.62

0.76

1.1

0.69

0.83

1.2

0.76

0.97

1.3

1.0

1.4

1.7

11

0.76

13

0.90

14

0.97

12

0.83

14

0.97

19

1.3

13

0.90

15

1.0

20

1.4

14

0.97

17

1.2

22

1.5

18

1.2

23

1.6

28

1.9

13

0.90

14

0.97

15

1.0

13

0.90

15

1.0

20

1.4

14

0.97

16

1.1

21

1.5

15

1.0

18

1.2

23

1.6

20

1.4

24

1.7

29

2.0

Protection from Foreign Material

The standard brass Type P594-1 lter or aluminum 
Type P593-1 lter in the pilot inlet connection has 
a replaceable cellulose lter element. A Type 252 
lter is recommended for heavy amounts of foreign 
material in the lines. These lters are described in 
separate bulletins.

Noise Abatement Trim

At elevated pressure drops and ow rates regulators 
with standard trims can produce noise levels that 
exceed regulatory limits, causing a nuisance for 
neighbors and even causing mechanical damage 
to equipment and piping. Whisper Trim™ Cages are
available with the Type 1098-EGR to reduce noise be 
up to 30 dBA.

Applications

Low Pressure Gas Distribution Systems

The Type 1098-EGR offers superior performance 
when utilized to supply low pressure (typically 4 to 
12 in. w.c. / 10 to 30 mbar) at district stations operated

by gas distribution companies. The two path control 
system (outlet pressure by control pilot) allows for tight 
control over the large range of ows typical to district 
stations. The knife-edged seats in the main valve plug 
allow for tight shutoff and the cage-guided metal plug 
aids in stability. Droop can be reduced to a minimum 
by utilizing an application specic pilot control 
system, main valve spring and actuator combination 
(for example, a low droop system would utilize the 
95 Series Pilot supplying a Type Y600AM control 
pilot, size 70 actuator, a xed restrictor or the Type 112

variable restrictor set at 3 and the smallest appropriate

main valve spring).

Monitoring Systems

Monitoring regulators serve as overpressure protection 
devices to limit system pressure in the event of open 
failure of a working regulator feeding the system. 
Two methods of using Type 1098-EGR regulators in 
monitoring systems are as follows:

8

Bulletin 71.2:1098-EGR

Type 1098-EGR

1098-EGR Working Monitor

6350 SERIES PILOT

6350 SERIES PILOT

March 2007

Type 1098-EGR

TYPE Y600M OR 627-109
MONITORING PILOT

6350 SERIES PILOT

TYPE Y600M OR 627-109
MONITORING PILOT

A6788

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

INTERMEDIATE PRESSURE

Figure 3. Working Monitor System

Table 6. Working Monitor Performance

MONITORING PILOT INFORMATION

Construction

Type 161AYW pilot and 150 psig / 

10.3 bar maximum allowable 
pilot inlet pressure

Type 627-109 pilot and 150 psig /

10.3 bar maximum allowable pilot 
inlet pressure for cast iron body

or 750 psig / 51.7 bar maximum 
allowable pilot inlet pressure for

malleable iron or steel body

3 to 12 in. w.c.

11 to 25 in. w.c.

25 in. w.c. to 2.5 psi

2.5 to 4.5 psi

Spring Range

psig bar

62 mbar to 0.17 bar

4.5 to 7 psi

5 to 20
15 to 40
35 to 80

70 to 150

130 to 200

7 to 30 mbar

27 to 62 mbar

0.17 to 0.31

0.31 to 0.4

0.34 to 1.4

1.0 to 2.8

2.4 to 5.5

4.8 to 10.3

9.0 to 13.8

6350 SERIES PILOT

Spring Part Number

1B653927022
1B537027052

1B537127022
1B537227022
1B537327052

10B3076X012
10B3077X012
10B3078X012

10B3079X012

MINIMUM PRESSURE AT WHICH 

WORKING MONITOR REGULATOR 

CAN BE SET

3 in. w.c. / 7 mbar over

normal distribution pressure

14 in. w.c. / 34 mbar over

normal distribution pressure

3.0 psig / 0.21 bar over

normal distribution pressure

5.0 psig / 0.34 bar over

normal distribution pressure

Working Monitor (Figure 3)

On a working monitor installation, the working monitor 
regulator is always upstream and acts as a rst-stage 
regulator through the working pilot during normal 
operation. This arrangement allows the working 
monitor’s performance to be observed at all times.

If the second-stage regulator fails to open, the working 
monitor regulator assumes the entire pressure 
reduction function of the system via the monitoring 
pilot. Note that the working monitor regulator actuator 
must be able to withstand full inlet pressure or be 
protected from it if the working monitor fails wide-open.

The monitoring pilot must be upstream of the working 
monitor regulator. This enables a close setpoint 
between the working regulator and the monitoring pilot. 
Special Types 161AYW and 627-109 monitoring pilots 
with quick-bleed operation have been designed to give 
faster response to abnormal downstream conditions. 
Table 6 gives the spread between normal distribution 
pressure and the minimum pressure at which the 
working monitor regulator can be set to take over if the 
working regulator fails open.

9

Bulletin 71.2:1098-EGR

Type 1098-EGR

Type 1098-EGR Upstream or Downstream “Wide-Open” Monitor

6350 SERIES PILOT

PILOT SUPPLY REGULATOR

6350 SERIES PILOT

July 2011

Type 1098-EGR

PILOT SUPPLY REGULATOR

6350 SERIES PILOT

A6789

INLET PRESSURE

OUTLET PRESSURE

LOADING PRESSURE

MONITOR LOADING PRESSURE

ATMOSPHERIC PRESSURE

INTERMEDIATE PRESSURE

Figure 4. Wide-Open Monitor System

Wide-Open Monitor (Figure 4)

setting and/or if the monitor pilot supply regulator 

6350 SERIES PILOT

pressure setting is adjusted too closely to the monitor 

Either the upstream or downstream regulator can be 
the monitoring regulator. During normal operation, the 
monitoring regulator is standing wide-open with the 
reduction to distribution pressure being taken across 
the working regulator. Only in case of open failure of 
the working regulator does the wide-open monitoring 
regulator take control at its slightly higher setting.

Regardless of which regulator is used as the monitor, 
it should be equipped with a pilot supply regulator 
set to limit the pilot supply pressure to 10 to 15 psig /

0.69 to 1.0 bar above control pressure. Since the 

regulator pressure setting. The monitor pressure 
setting should be adjusted so it is at minimum 2 times 
the pilot proportional band pressure above the working 
regulator pressure setting. The monitor pilot supply 
pressure setting should be adjusted so it is at minimum 
5 psig / 0.34 bar plus the monitor minimum differential 
pressure above the working regulator pressure setting. 
These adjustments must be made such that other 
governing pressure limits, such as casing ratings, pilot 
maximum differential pressures or regulatory limits,

are not exceeded.

pilot on the monitoring regulator is wide-open during 
normal operation, the pilot supply regulator prevents 
differential relief valve chatter on the monitoring 
regulator pilot.

Water Service

When using the Type 1098-EGR in aqueous service, 
it is important to make the proper material and pilot

selections. Table 9 shows proper material selections

Adjustment Recommendations for
Monitor Applications

Low amplitude/high frequency monitor trim oscillations 
can occur if the monitor regulator pressure setting is 
adjusted too closely to the working regulator pressure

for erosive or corrosive service. In both cases, a low 
gain pilot should be used on any aqueous service. 
The low gain pilot improves the speed of response 
of the regulator in aqueous applications. Follow 
all general procedures when operating the 
Type 1098-EGR in aqueous service.

10

Bulletin 71.2:1098-EGR

TYPE 1098-EGR 

SIZE 70 WITH 

QUICK OPENING 

CAGE AND YELLOW 

MAIN SPRING

20 psi / 1.4 bar MAxIMUM

TO BURNER PILOT

TO MAIN BURNER

E0711

Figure 5. Boiler Fuel Conguration

TYPE Y600AM

AUXILIARY PILOT

TYPE 6352

WORKING PILOT

11

Bulletin 71.2:1098-EGR

SAFETY 

SHUTOFF VALVE

GAS

SUPPLY

TYPE 1098-EGR

PILOT 

GAS

SUPPLY

E0710

PILOT GAS

REGULATOR

Figure 6. Boiler Fuel Conguration Installation Guide

TO BOILER

FAST-ACTING

LOAD VALVE

TO PILOT LIGHT

BLEED VALVE

(NORMALLY CLOSED)

E0712

TYPE 1098-EGR

MAIN VALVE

S

Figure 7. Fast-Closing Application Installation Guide

12

BLOCK VALVE

(NORMALLY OPEN)

SOLENOID VALVE

(NORMALLY CLOSED)

BLOCK VALVE

(NORMALLY OPEN)

Bulletin 71.2:1098-EGR

Table 7. Auxiliary Pilot Selection (Fast Stroke Dual Pilot)

SIZE CONSTRUCTION

Type Y600AM

3/4 NPT

Type 627M 5 to 10 0.34 to 0.69 10B3076X012 Yellow

ORIFICE, 

In. / mm

1/4 / 6.4

SPRING RANGE

psi bar

4 to 8 in. w.c. 10 to 20 mbar 1B653827052 Red

7 to 16 in. w.c. 17 to 40 mbar 1B653927022 Unpainted

15 in. w.c. to 1.2 psi 37 mbar to 0.08 bar 1B537027052 Yellow

1.2 to 2.5 0.08 to 0.17 1B537127022 Green

2.5 to 4.5 0.17 to 0.31 1B537227022 Light Blue

4.5 to 7 0.31 to 0.48 1B537327052 Black

SPRING 

NUMBER

SPRING 
COLOR

Table 8. Boiler Fuel Pressure Control Construction Selections

TYPE EGR BODY SIZE

NPS DN

1 25 37A7211X012 - - - - - - - - - - - - - - -

2 50 37A7212X012 14A6768X012

3 80 37A7213X012 14A6771X012

4 100 37A7214X012 14A6770X012 1.3 0.09

6, 8 x 6 and 12 x 6 150, 200 x 150 and 300 x 150 37A7215X022 15A2253X012 2.2 0.15

1. Limited to maximum P1 of 20 psig / 1.4 bar.

2. Yellow spring is limited to use with Size 70 actuator only.

3. Minimum differential pressure for full stroke is based on yellow main spring and a Size 70 actuator.

QUICK-OPENING

CAGE PART NUMBER

YELLOW MAIN SPRING

(1)

 PART NUMBER

MINIMUM DIFFERENTIAL PRESSURE 

(2)

MINIMUM PRESSURE

AT WHICH AUXILIARY

PILOT CAN BE SET

1 in. w.c. / 2 mbar

6 in. w.c / 14 mbar

8 in. w.c / 21 mbar

FOR FULL STROKE

psi bar

1 0.07

Under working 

pilot setpoint

Under working 

pilot setpoint

Under working 

pilot setpoint

(3)

Table 9. Construction Materials for Aqueous Service

AQUEOUS SERVICE TYPE

Erosive 416 Stainless steel

Corrosive 316 Stainless steel

1. A low gain pilot should be used on aqueous applications.

Cage and Seat Ring Body Flange Main Spring

Fast Closing Regulator (Figure 7)

When a Type 1098-EGR regulator is used upstream 
of a double block and bleed system, it is sometimes 
necessary to modify the Type 1098-EGR control

system to increase the closing speed.

A solenoid can be installed as shown in Figure 7. In 

normal operation, the solenoid valve is closed. The

solenoid wiring is connected to the block valve electric 
logic so that the solenoid on the regulator opens when 
the block valve is closed.

Inconel® is a mark owned by Special Metals Corporation.

CONSTRUCTION MATERIAL

®

CF8M Stainless steel Inconel

X-750

This concept will quickly equalize pressure on both 
sides of the Type 1098 diaphragm and allow quick 
closure. In some systems, the Type 1098-EGR will 
close faster than the block valve as evidenced by 
a momentary decline in the Type 1098-EGR outlet 
pressure. The pressure is then promptly restored 
back to a setpoint by ow through the pilot only 
(i.e., the main valve is unable to open because of the 
solenoid valve).

13

Bulletin 71.2:1098-EGR

Capacity Information

Note

Flow capacities are laboratory 
verified; therefore, regulators may 
be sized for 100% of the published 
flow capacities. It is not necessary to 
reduce published capacities.

Gases

Table 12 shows the natural gas regulating capacities 
of the Type 1098-EGR at selected inlet and outlet 
pressure settings. Flows are in thousands of SCFH at
60°F and 14.7 psia and in thousands of Nm3/h at 0°C
and 1.01325 bar of 0.6 specic gravity natural gas.

To determine equivalent capacities for air, propane, 
butane or nitrogen, multiply the capacity by the 
following appropriate conversion factor: 0.775 for 
air, 0.628 for propane, 0.548 for butane or 0.789 for 
nitrogen. For gases of other specic gravities, multiply 
the given capacity by 0.775 and divide by the square 
root of the appropriate specic gravity.

For pressure drops lower than critical (absolute outlet 
pressure greater than one-half of absolute inlet pressure).

C

g

where,

      Q  =  gas ow rate, SCFH

      G  =  gas specic gravity of the gas

       T  =  absolute temperature of gas at inlet, °Rankine

Cg =  gas sizing coefcient

P1 =  absolute inlet pressure, psia 

        (P1 gauge + 14.7)

C1  =  ow coefcient

∆P =  pressure drop across the regulator, psi

Then, if capacity is desired in normal cubic meters 
per hour (Nm3/h) at 0°C and 1.01325 bar, multiply

SCFH by 0.0268.

520

=

CgP1SIN

GT

3417

)

∆P

C

1

DEG

)

P

1

Liquids

To nd appropriate regulating capacities at pressure 
settings not given in Table 12 or to nd wide-open 
ow capacities for relief sizing at any inlet pressure, 
perform one of the following procedures. Then, if 
necessary, convert using the factors provided above.

For critical pressure drops (absolute outlet pressure 
equal to or less than one-half of absolute inlet 
pressure), use the following formula:

Q = (P1)(Cg)(1.29)

where,

     Q  =  gas ow rate, SCFH

P1  =  absolute inlet pressure, psia (P1 gauge + 14.7)

Cg  =  regulating or wide-open gas sizing coefcient 

              from Table 14, 15 or 16

Then, if capacity is desired in normal cubic meters per 
hour at 0°C and 1.01325 bar, multiply SCFH by 0.0268.

The liquid capacities in Table 13 are in gallons per 
minute and liters per minute of water. To determine 
ow capacity not given, use the following equation:

∆P

C

Q

=

v

G

where,

      Q    =  liquid ow rate, GPM

Cv   =  liquid sizing coefcient

∆P  =  pressure drop across the regulator, psi

       G   =  specic gravity (specic gravity of water is 1)

If capacity is desired in liters per minute, multiply 
gallons per minute by 3.785. Use the Km values to 
predict choked ow on aqueous service.

14

Bulletin 71.2:1098-EGR

Table 10. Proportional Band (Standard Pilot Restriction and Size 40 Type 1098 Actuator

BODY SIZE

NPS DN psi mbar psi mbar psi mbar

1 25

2 50

3 80

1.  For other combinations, multiply table values by 1.6 for a size 30 actuator, 0.4 for a size 70 actuator, 2.0 for a low-gain Type 6352 or 6353 pilot restriction and 0.5 for a high-gain 
Type 6352 or 6353 pilot restriction. For instance, a standard NPS 2 / DN 50 Type 1098-EGR-6352 regulator with black pilot control spring and blue main valve spring has a proportional 
band of 0.3 psi / 0.021 bar as given in the table, but this same regulator with low-gain restriction and size 70 actuator has a proportional band of 0.3 psi / 0.021 bar x 2.0 x 0.4 =

0.24 psi / 0.017 bar.

2.  The conguration utilized in determining the proportional band of the Type Y600AM included the 95 Series pilot supplying the Type Y600AM for improved stability and a xed restrictor, 
part number 1K9484X0022 or an optional Type 112 variable restrictor with a setting of 3.

Type Control Spring Color

6351

6352

6353

61L

61LD 0.04 3 0.08 6 0.20 14

61LE, 61H and 61HP 0.40 28 0.80 55 1 69

Y600AM

6351

6352

6353

61L

61LD 0.05 3 0.10 7 0.30 21

61LE, 61H and 61HP 0.50 34 1 69 1.40 97

Y600AM

6351

6352

6353

61L

61LD 0.10 7 0.20 14 0.50 34.5

61LE, 61H and 61HP 0.90 62 1.20 83 1.50 103

Y600AM

PILOT PROPORTIONAL BAND

Yellow or Green 

Main Valve Spring

Green 0.10 7 0.20 14 0.40 28

Unpainted 0.20 14 0.40 28 0.80 55

Red 0.40 28 0.80 55 1 69

Yellow 0.04 3 0.10 7 0.20 14

Black 0.08 6 0.20 14 0.40 28

Yellow 0.20 14 0.40 28 0.80 55

Red 0.40 28 0.80 55 1 69

0.09 6 0.16 11 0.30 21

All

Red 0.01 0.6 0.02 1 0.04 3

Unpainted 0.01 0.6 0.02 1 0.04 3

(2)

(2)

(2)

Yellow 0.05 3 0.10 7 0.15 10

Green 0.10 7 0.15 10 0.20 14

Light Blue 0.15 10 0.20 14 0.25 17

Black 0.20 14 0.25 17 0.30 21

Green 0.20 14 0.30 21 0.50 34

Unpainted 0.30 21 0.50 34 1 69

Red 0.50 34 1 69 1.40 97

Yellow 0.05 3 0.15 10 0.30 21

Black 0.10 7 0.30 21 0.60 41

Yellow 0.30 21 0.50 34 1 69

Red 0.50 34 1 69 1.40 97

0.10 7 0.20 14 0.60 41

All

Red 0.01 0.6 0.02 1 0.04 3

Unpainted 0.01 0.6 0.02 1 0.04 3

Yellow 0.05 4 0.10 7 0.15 10

Green 0.10 7 0.15 10 0.20 14

Light Blue 0.15 10 0.20 14 0.25 17

Black 0.20 14 0.25 17 0.30 21

Green 0.30 21 0.40 28 0.60 41

Unpainted 0.40 28 0.60 41 1.20 83

Red 0.90 62 1.20 83 1.50 103

Yellow 0.10 7 0.20 14 0.40 27.6

Black 0.20 14 0.40 28 0.80 55.2

Yellow 0.40 28 0.60 41 1.20 82.8

Red 0.90 62 1.20 83 1.50 103

0.20 14 0.40 28 1 69.0

All

Red 0.01 0.6 0.02 1 0.04 3

Unpainted 0.01 0.6 0.02 1 0.04 3

Yellow 0.05 4 0.10 7 0.15 10

Light Green 0.10 7 0.15 10 0.20 14

Light Blue 0.15 10 0.20 14 0.25 17

Black 0.20 14 0.25 17 0.30 21

(1)

)

Main Valve Spring

Blue

Red

Main Valve Spring

- continued -

15

Bulletin 71.2:1098-EGR

Table 10. Proportional Band (Standard Pilot Restriction and Size 40 Type 1098 Actuator

PILOT PROPORTIONAL BAND

BODY SIZE

Type

NPS DN psi mbar psi mbar psi mbar

6351

6352

6353

4 100

6, 8 x 6 and

12 x 6

1.  For other combinations, multiply table values by 1.6 for a size 30 actuator, 0.4 for a size 70 actuator, 2.0 for a low-gain Type 6352 or 6353 pilot restriction and 0.5 for a high-gain 
Type 6352 or 6353 pilot restriction. For instance, a standard NPS 2 / DN 50 Type 1098-EGR-6352 regulator with black pilot control spring and blue main valve spring has a proportional 
band of 0.3 psi / 0.021 bar as given in the table, but this same regulator with low-gain restriction and size 70 actuator has a proportional band of 0.3 psi / 0.021 bar x 2.0 x 0.4 =

0.24 psi / 0.017 bar.

2.  The conguration utilized in determining the proportional band of the Type Y600AM included the 95 Series pilot supplying the Type Y600AM for improved stability and a xed 
restrictor, part number 1K9484X0022 or an optional Type 112 variable restrictor with a setting of 3.

150, 200 x 150

and 300 x 150

61L

61LD 0.15 10 0.30 21 0.70 48

61LE, 61H and 61HP 1.20 83 2.00 138 3.00 207

(2)

Y600AM

6351

6352

6353

61L

61LD 0.30 21 0.60 41 2.00 69

61LE, 61H and 61HP 1.50 103 2.50 172 3.50 241

(2)

Y600AM

Control Spring

 Color

Green 0.40 28 0.50 34 0.80 55

Unpainted 0.70 48 0.80 55 1.40 97

Red 1.20 83 2.00 138 3.00 207

Yellow 0.15 10 0.30 21 0.60 41

Black 0.30 21 0.60 41 1.20 83

Yellow 0.70 48 0.80 55 1.40 97

Red 1.20 83 2.00 138 3.00 207

All

Red 0.01 0.6 0.02 1 0.04 3

Unpainted 0.01 0.6 0.02 1 0.04 3

Yellow 0.05 3 0.10 7 0.15 10

Green 0.10 7 0.15 10 0.20 14

Light Blue 0.15 10 0.20 14 0.25 17

Black 0.20 14 0.25 17 0.30 21

Green 0.50 34 0.60 41 1.00 69

Unpainted 0.90 62 1.50 103 2.00 138

Red 1.50 103 2.50 172 3.50 241

Yellow 0.20 14 0.40 28 0.80 55

Black 0.40 28 0.80 55 1.60 110

Yellow 0.90 62 1.50 103 2.00 138

Red 1.50 103 2.50 172 3.50 241

All

Red 0.01 0.6 0.02 1 0.04 3

Unpainted 0.01 0.6 0.02 1 0.04 3

Yellow 0.05 3 0.10 7 0.15 10

Green 0.05 3 0.15 10 0.20 14

Light Blue 0.15 10 0.20 14 0.25 17

Black 0.20 14 0.25 17 0.30 21

Yellow or Green 

Main Valve Spring

0.30 21 0.60 41 1.40 97

0.60 41 1.20 83 2.00 138

(1)

) (continued)

Main Valve Spring

Blue

Red

Main Valve Spring

Table 11. Approximate Proportional Band Range (Standard Pilot Restriction, Size 30 Type 1098H Actuator

PILOT APPROXIMATE PROPORTIONAL BAND RANGE

BODY SIZE

Type

NPS DN psi bar psi bar psi bar

1 25

2 50 1.5 0.10 2.0 0.14 3.0 0.21

3 80 2.5 0.17 3.0 0.21 4.0 0.28

4 100 3.5 0.24 4.0 0.28 5.0 0.34

6, 8 x 6

or 12 x 6

1.  For other restrictions, multiply table values by 2.0 for a low-gain restriction or by 0.5 for a high gain restriction. For instance, a standard NPS 2 / DN 50 Type 1098H-EGR-6354L 
regulator with blue control spring and blue main valve spring has a proportional band of 2.0 psi / 0.14 bar as given in the table. But this same regulator with low-gain restriction has a 
proportional band of 2.0 psi / 0.14 bar x 2.0 = 4.0 psi / 0.28 bar.

150, 200 x 150

or 300 x 150

6354L, 6354M or 

6354H

Control Spring 

Color

Blue or Green

Green Main

Valve Spring

1 0.07 1.5 0.10 2.5 0.17

4 0.28 5.0 0.34 Not Available

Blue Main

Valve Spring

(1)

)

Red Main

Valve Spring

16

Bulletin 71.2:1098-EGR

Table 12. Natural Gas Capacities

3

CAPACITIES IN THOUSANDS OF SCFH / Nm

INLET

PRESSURE

psig bar psig bar SCFH Nm

3 0.21 7 in. w.c. 17 mbar 8 0.2 32 0.9 66 1.8 101 2.7 - - - - - - - - - - - - - - - -

5 0.34

10 0.69

15 1.0

20 1.4

30 2.1

40 2.8

50 3.4

75 5.2

100 6.9

125 8.6

150 10.3

175 12.1 68 4.7 or less 147 3.9 558 15.0 1133 30.4 1791 48.0 3157 84.6 4522 121 5183 139

200 13.8

250 17.2 205 5.5 779 20.9 1581 42.4 2500 67.0 4405 118 6310 169 7232 194

300 20.7 244 6.5 926 24.8 1880 50.4 2972 79.6

350 24.1 282 7.6 1073 28.8 2178 58.4 3444 92.3 6069 163 8694 234 9964 267

400 27.6 321 8.6 1220 32.7 2477 66.4 3916 105 6901 185 9886 265 11,331 304

OUTLET 

PRESSURE

SETTING

7 in. w.c.

1
2

7 in. w.c.

3
5
7

1
4
8

12

1
10
15
17

4
15
20
25

9
20
30
35

13
20
30
40
45

24
50
60
70

35
60
75

46
75

57
75

75 5.2 or less

17 mbar

17 mbar

0.3 or less

0.6 or less

0.9 or less

1.6 or less

2.4 or less

3.2 or less

3.9 or less

0.07

0.1

0.2

0.3

0.5

0.07

0.3

0.5

0.8

0.07

0.7

1.0

1.2

1.0

1.4

1.7

1.4

2.1

2.4

1.4

2.1

2.8

3.1

3.4

4.1

4.8

4.1

5.2

5.2

5.2

NPS 1 /  

DN 25 

Body Size

11
10

9

17
15
13
11

21
20
17
12

27
21
16
13

35
29
25
18

42
36
28
21

50
45
40
31
22

69
54
44
27

89
74
62

108

91

127
115

166 4.5 631 16.9 1282 34.4 2027 54.3 3573 95.8 5118 137 5866 157

FOR REGULATORS WITH STANDARD LINEAR CAGE, STANDARD TRAVEL 

NPS 2 /

 DN 50 

Body Size

3

/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h

0.3

42

0.3

39

0.2

35

0.5

63

0.4

56

0.4

49

0.3

40

0.6

79

0.5

74

0.5

63

0.3

44

0.7

102

0.6

79

0.4

60

0.4

48

0.9

131

0.8

108

0.7

93

0.5

69

1.1

161

1.0

136

0.8

105

0.6

77

1.3

190

1.2

172

1.1

152

0.8

115

0.6

85

1.9

264

1.5

203

1.2

166

0.7

101

2.4

337

2.0

280

1.7

236

2.9

411

2.4

344

3.4

484

3.1

436

AND LINE SIZE EQUALS MAIN VALVE BODY SIZE

NPS 3 / 

DN 80 

Body Size

1.1

87
82
73

129
116
102

82

163
153
130

91

207
164
125

99

267
223
192
144

327
280
217
161

386
354
313
240
176

536
419
343
209

685
578
489

834
710

984
897

2.3

2.2

2.0

3.5

3.1

2.7

2.2

4.4

4.1

3.5

2.4

5.6

4.4

3.4

2.7

7.2

6.0

5.2

3.9

8.8

7.5

5.8

4.3

10.3

9.5

8.4

6.4

4.7

14.4

11.2

9.2

5.6

18.4

15.5

13.1

22.4

19.0

26.4

24.0

1.0

0.9

1.7

1.5

1.3

1.1

2.1

2.0

1.7

1.2

2.7

2.1

1.6

1.3

3.5

2.9

2.5

1.6

4.3

3.6

2.8

2.1

5.1

4.6

4.1

3.1

2.3

7.1

5.4

4.5

2.7

9.0

7.5

6.3

11.0

9.2

13.0

11.7

/h OF 0.6 SPECIFIC GRAVITY NATURAL GAS 

NPS 4 / 

DN 100 

Body Size

135
126
112

201
180
158
127

254
237
201
140

328
254
192
153

422
345
297
221

517
434
335
247

611
551
485
369
270

847
648
529
322

1083

896
754

1319
1101

1555
1396

3.6

3.4

3.0

5.4

4.8

4.2

3.4

6.8

6.4

5.4

3.8

8.8

6.8

5.2

4.1

11.3

9.3

8.0

5.9

13.9

11.6

9.0

6.6

16.4

14.8

13.0

9.9

7.24

22.7

17.4

14.2

8.63

29.0

24.0

20.2

35.3

29.5

41.7

37.4

NPS 6 / 
DN 150

Body Size

257
241

- - - -

- - - -

376
341
302

- - - -

- - - -

471
445
385

- - - -

- - - -

577
482
371

- - - -

- - - -

744
651
568
429

910
816
644
480

1077
1023

919
712
526

1493
1232
1019

627

1909
1689
1444

2325
2072

2741
2593

5237 140 7502 201 8598 230

6.9

6.5

10.1

9.1

8.1

12.6

11.9

10.3

15.5

12.9

9.9

19.9

17.5

15.2

11.5

24.4

21.9

17.3

12.9

28.9

27.4

24.6

19.1

14.1

40.0

33.0

27.3

16.8

51.2

45.3

38.7

62.3

55.5

73.5

69.5

NPS 8 x 6 /

 DN 200 x 150

Body Size

372
350

- - - -

542
493
438

- - - -

678
642
557

- - - -

827
696
538

- - - -

1066

940
822
622

1304
1178

933
697

1542
1473
1327
1032

764

2138
1781
1476

911

2734
2438
2090

3330
2990

3926
3735

10.0

9.4

- - - -

14.5

13.2

11.7

- - - -

18.2

17.2

14.9

- - - -

22.1

18.7

14.4

- - - -

28.6

25.2

22.0

16.7

34.9

31.6

25.0

18.7

41.3

39.5

35.6

27.7

20.5

57.3

47.7

39.6

24.4

73.2

65.3

56.0

89.2

80.1

105
100

NPS 12 x 6 /

DN 300 x 150

 Body Size

- - - - - - - -

427
401

- - - -

622
565
502

- - - -

777
735
638

- - - -

948
798
616

- - - -

1221
1077

942
713

1495
1350
1069

798

1768
1688
1521
1182

875

2451
2041
1692
1044

3134
2794
2396

3817
3427

4500
4281

11.4

10.7

- - - -

16.7

15.1

13.5

- - - -

20.8

19.7

17.1

- - - -

25.4

21.4

16.5

- - - -

32.7

28.9

25.2

19.1

40.1

36.2

28.6

21.4

47.4

45.2

40.8

31.7

23.5

65.7

54.7

45.3

28.0

84.0

74.9

64.2

102

91.8

121
115

17

Bulletin 71.2:1098-EGR

Table 13. Liquid Capacities

INLET

PRESSURE

psig bar psig bar GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min

3 0.21 0.25 0.02 28 106 105 397 219 829 335 1268 658 2491 959 3630 1098 4156

5 0.34

10 0.69

15 1.0

20 1.4

30 2.1

40 2.8

50 3.4

75 5.2

100 6.9

125 8.6

150 10.3

175 12.1 68 4.7 or less 174 659 655 2479 1365 5167 2090 7911 4107 15,545 5979 22,630 6848 25,920

200 13.8

250 17.2 222 840 837 3168 1746 6609 2672 10,114 5252 19,879 7646 28,940 8757 33,145

300 20.7 252 954 950 3596 1980 7494 3030 11,469 5955 22,540 8670 32,816 9930 37,585

350 24.1 279 1056 1050 3974 2189 8285 3350 12,680 6584 24,920 9585 36,279 10,978 41,552

400 27.6 303

OUTLET 

PRESSURE

SETTING

0.25
1
2

0.25
3
5
7

1
4
8

12

1

10
15
17

4

15
20
25

9

20
30
35

13
20
30
40
45

24
50
60
70

35
60
75

46
75

57
75

75 5.2 or less

0.02

0.07

0.1

0.02

0.2

0.3

0.5

0.07

0.3

0.5

0.8

0.07

0.7

1.0

1.2

0.3 or less

1.0

1.4

1.7

0.6 or less

1.4

2.1

2.4

0.9 or less

1.4

2.1

2.8

3.1

1.6 or less

3.4

4.1

4.8

2.4 or less

4.1

5.2

3.2 or less

5.2

3.9 or less

5.2

NPS 1 / 

DN 25 

Body Size

37

140

34

129

29

110

52

197

44

167

38

144

29

110

63

238

56

212

44

167

29

110

73

276

53

201

38

144

29

110

86

326

65

246

53

201

38

144

94

356

75

284

53

201

38

144

102

386

92

348

75

284

53

201

38

144

120

454

84

318

65

246

38

144

135

511

106

401

84

318

149

564

119

450

162

613

145

549

188 712 708 2680 1476 5587 2258 8547 4439 16,802 6462 24,459 7401 28,013

1147 1141 4319 2380 9008 3642 13,785 7157 27,089 10,420 39,440 11,934 45,170

FOR REGULATORS WITH STAINLESS STEEL LINEAR HOLE CAGE

NPS 2 /  

DN 50 

Body Size

138

522

127

481

110

416

198

749

167

632

142

537

110

416

237

897

210

795

167

632

110

416

276

1045

200

757

142

537

110

416

323

1223

245

927

200

757

142

537

1332

352
283

1071

200

757

142

537

385

1457

347

1313

283

1071

200

757

142

537

452

1711

317

1200

245

927

142

537

510

1930

400

1514

317

1200

563

2131

448

1696

610

2309

548

2074

CAPACITIES IN GPM / l/min OF WATER

NPS 3 /  

DN 80 

Body Size

288
264
229

412
349
295
229

494
438
349
229

575
417
295
229

673
511
417
295

735
590
417
295

803
723
590
417
295

943
660
511
295

1064

835
660

1173

933

1273
1143

1090

999
867

1559
1321
1117

867

1870
1658
1321

867

2176
1578
1117

867

2547
1934
1578
1117

2782
2233
1578
1117

3039
2737
2233
1578
1117

3569
2498
1934
1117

4027
3160
2498

4440
3531

4818
4326

NPS 4 /  
DN 100

Body Size

440
404
350

631
534
452
350

756
670
534
350

880
639
452
350

1030

782
639
452

1125

903
639
452

1229
1106

903
639
452

1443
1010

782
452

1629
1278
1010

1795
1428

1948
1749

1665
1529
1325

2388
2021
1711
1325

2861
2536
2021
1325

3331
2419
1711
1325

3899
2960
2419
1711

4258
3418
2419
1711

4652
4186
3418
2419
1711

5462
3823
2960
1711

6166
4837
3823

6794
5405

7373
6620

Body Size

865
794
688

1240
1050

888
688

1485
1317
1050

688

1730
1255

888
688

2024
1538
1255

888

2210
1775
1255

888

2415
2174
1775
1255

888

2835
1985
1538

888

3201
2511
1985

3529
2807

3829
3438

NPS 6 /  
DN 150

3274
3005
2604

4693
3974
3361
2604

5621
4985
3974
2604

6548
4750
3361
2604

7661
5821
4750
3361

8365
6718
4750
3361

9141
8229
6718
4750
3361

10,730

7513
5821
3361

12,116

9504
7513

13,357
10,624

14,493
13,013

NPS 8 x 6 / 

DN 200 x 150

Body Size

1260

4769

1156

4375

1001

3789

1805

8632

1529

5787

1292

4890

1001

3789

2163

8187

1917

7256

1529

5787

1001

3789

2519

9534

1828

6919

1292

4890

1001

3789

2947

11,154

2239

8475

1828

6919

1292

4890

3218

12,180

2585

9784

1828

6919

1292

4890

3516

13,308

3166

11,983

2585

9784

1828

6919

1292

4890

4128

15,624

2890

10,939

2239

8475

1292

4890

4660

17,638

3656

13,837

2890

10,939

5137

19,444

4087

15,469

5574

21,098

5006

18,948

NPS 12 x 6 / 

DN 300 x 150

Body Size

1443
1324
1147

2067
1751
1480
1147

2477
2196
1751
1147

2886
2093
1480
1147

3376
2564
2093
1480

3686
2961
2093
1480

4027
3626
2961
2093
1480

4728
3310
2564
1480

5337
4187
3310

5884
4681

6384
5733

5462
5011
4342

7824
6628
5602
4341

9375
8312
6628
4341

10,924

7922
5602
4341

12,778

9705
7922
5602

13,952
11,207

7922
5602

15,242
13,724
11,207

7922
5602

17,895
12,528

9705
5602

20,201
15,848
12,528

22,271
17,718

24,163
21,699

18

Bulletin 71.2:1098-EGR

Table 14. Flow Coefcients for Type 1098-EGR with Linear Cage

BODY SIZE

NPS DN Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open

1:1 LINE SIZE TO BODY SIZE 2:1 LINE SIZE TO BODY SIZE

C

g

C

v

C

1

C

g

C

v

C

1

1 25 600 632 16.8 17.7 35.7 568 598 17.2 18.1 33.0

2 50 2280 2400 63.3 66.7 36.0 2050 2160 59.6 62.8

3 80 4630 4880 132 139 35.1 4410 4650 128 135 0.779 0.30

34.4

4 100 7320 7710 202 213 36.2 6940 7310 198 209 35.0 0.829

6 150 12,900 13,600 397 418 32.5 12,100 12,800 381 404 31.7 0.668

8 x 6 200 x 150 18,480 19,450 578 608

12 x 6 300 x 150 21,180 22,290 662 697 19,900 20,950 622 655

17,370 18,280 543 571

32.0

32.0 0.648

Table 15. Flow Coefcients for Type 1098-EGR with Quick Opening Trim

BODY SIZE

NPS DN Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open

1 25 769 810 23.9 25.2 32.2 728 766 24.5 25.7 29.8

2 50 2460 2590 68.3 71.9 36.0 2214 2331 64.4 67.8 34.4 0.820

3 80 4790 5050 141 149 33.9 4571 4812 137 145 33.3 0.727

4 100 8120 8550 229 242 35.4 7701 8106 225 237 34.2 0.793 0.30

6 150 14,915 15,700 445 469 33.5 14,571 15,350 435 458 33.5 0.710

12 x 6 300 x 150 25,750 780 25,760 781

15,770

1:1 LINE SIZE TO BODY SIZE 2:1 LINE SIZE TO BODY SIZE

C

g

22,470

478

C

v

681

C

1

33.0 15,410

C

g

20,100

467

C

v

609

C

1

33.0 0.689

K

0.70

K

0.70

m

m

COEFFICIENT

xTFDF

0.806 0.43

0.820 0.35

COEFFICIENT

xTFDF

0.656

IEC SIZING 

L

0.84

0.28

IEC SIZING 

L

0.36

0.84

0.288 x 6 200 x 150

Table 16. Flow Coefcients for Type 1098-EGR with Whisper Trim™ Cage

BODY SIZE

NPS DN Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open Regulating Wide-Open

1:1 LINE SIZE TO BODY SIZE 2:1 LINE SIZE TO BODY SIZE

C

g

C

v

C

1

C

g

C

v

C

1

1 25 576 607 16.7 17.6 34.5 529 557 15.6 16.4 34.0

2 50 1970 2080 54.7 57.8 36.0 1830 1930 52.3 55.1 35.0 0.820 0.07

3 80 3760 3960 107 113 35.0 3630 3830 106 110 34.2 0.775 0.05

4 100 6280 6610 180 190 34.8 6020 6340 171 180 35.2 0.766 0.04

6 150 9450 9950 295 310 32.0 9240 9730 291 306 31.7 0.648

10,020 10,550 286 301

12 x 6 300 x 150 11,050 11,630 316 332 10,380 10,930 297 312

35.0

35.0 0.775

K

0.80

m

COEFFICIENT

xTFDF

0.753 0.10

IEC SIZING 

L

0.89

0.038 x 6 200 x 150 10,660 11,220 305 321

19

Bulletin 71.2:1098-EGR

A

A/2

R

G

C

1.94 /

49.3

D

H

E

B1113_1_B

(REMOVAL 
CLEARANCE FOR 
TRIM PACKAGE)

AR (ACTUATOR REMOVAL CLEARANCE)

M

Z 

IN. / 

mm

Figure 8. Type 1098-EGR Dimensions

20

Bulletin 71.2:1098-EGR

Table 17. Dimensions

ACTUATOR DIMENSION

M

Type and

Actuator Size

1098 - 30 11.38 289 5.69 145

1098 - 40 13.12 333 5.75 146

1098 - 70 21.12 536 7.44 189 14.19 360 15.81 402 15.62 397

1098H - 30 11.38 289 6.06 154 7.88 200 9.50 241 9.31 236

NPT 

Cast Iron, 

Body Size

NPS DN In. mm In. mm In. mm In. mm In. mm In. mm In. mm In. mm In. mm In. mm

1 25 8.25 210 7.25 184 7.75 197 7.62 194 3.88 98.6 8.62 219

2 50 11.25 286 10 254 10.5 267 10.19 259 4.56 116 9.12 232 13.31 338 15.06 383 3.12 79.2

3 80 13.25 337 11.75 298 12.5 317 11.81 300 5.31 135 11.31 287

4 100 15.5 394 13.88 353 14.5 368 13.56 344 6.56 167 12.69 322 19.12 486 21.12 536 5.12 130

6 150 20 508 17.75 451 18.62 473 17.48 444 8.06 205 13.62 346

8 x 6

12 x 6

CL600 RF, 

BWE or NPT 

Steel and

Stainless

Steel

200 x

24 610 21.4 544 22.4 569

150

300 x

32.3 820 29 737 30.5 775 12.56 319 17.72 450

150

C (Diameter) E H

In. mm In. mm In. mm In. mm In. mm

7.88 200 9.50 241 9.31 236

MAIN VALVE DIMENSION

A

CL125 FF 

Cast Iron or 

CL150 RF 

Steel and

Stainless

Steel

CL250 RF 

Cast Iron or 

CL300 RF 

Steel and

Stainless

Steel

PN 16/25/40

Steel and
Stainless

Steel

- - - - - - - -

D G R

9.76 248 15.02 382

With Pilot Spring 

Case Vent

Cast Iron

4.06 103

5.06 129

8 203 20.25 514 23.25 591 6.62 168

12 305 13.75 349 3 76.2

16.5 419 18.25 464 3.88 98.6

Without Pilot Spring 

Case Vent

Z

Steel and
Stainless

Steel

AR

Ordering Information

Use the Specications section on pages 2 and 3 and 
carefully review the description to the right of each 
specication. Use this information to complete the 
Ordering Guide on the following page. Specify the

desired selection wherever there is a choice to be

made. Then send the Ordering Guide to your local 
Sales Ofce.

Ordering Guide

Main Valve Body Size (Select One)

NPS 1 / DN 25***
  NPS 2 / DN 50***
  NPS 3 / DN 80***
  NPS 4 / DN 100***
  NPS 6 / DN 150***
  NPS 8 x 6 / DN 200 x 150

(not available in cast iron)***
  NPS 12 x 6 / DN 300 x 150 
         (not available in cast iron)***

Main Valve Body Material and

End Connection Style (Select One)

Cast Iron Body

NPT (1 or 2 NPT only)***
  CL125 FF***
  CL250 RF***

- continued -

21

Bulletin 71.2:1098-EGR

Ordering Guide (continued) 

WCC Steel Body

NPT (1 or 2 NPT only)***
  CL150 RF***

SWE (NPS 1 or 2 / DN 25 or 50 only)**

CL300 RF***
  CL600 RF* 
  Sch 40 BWE
  Sch 80 BWE 
  PN 16/25/40 (Not Available for NPS 8 x 6 or

12 x 6 / DN 200 x 150 or 300 x 150)* 
        Specify ____________

CF8M Stainless Steel

NPT (1 or 2 NPT only)***
  CL150 RF***
  CL300 RF***
  CL600 RF* 
  SWE (NPS 1 or 2 / 
  Sch 40 BWE
  Sch 80 BWE
  PN 16/25/40 (Not Available for NPS 8 x 6 or

12 x 6 / DN 200 x 150 or 300 x 150)* 
Specify ____________

DN 25 or 50

 only)**

Actuator and Bonnet Material (Select One)

  Steel casing with steel bonnet***

  Stainless steel casing with stainless steel bonnet**

Body Flange Material (Select One)

ENC Coated cast iron***
  ENC Coated steel***
  ENC Coated CF8M Stainless steel**

Plug and Seat Ring (Select One)

416 Stainless steel***
  316 Stainless steel**

Diaphragm, O-rings and Other Elastomers 

(Select One)

Nitrile (NBR)***
  Fluorocarbon (FKM)***
  Ethylenepropylene (EPDM)**

Outlet Pressure Range (Select One)

Type 6351 Pilot

3 to 20 psig / 0.21 to 1.4 bar**
  5 to 35 psig / 0.34 to 2.4 bar**
  35 to 100 psig / 2.4 to 6.9 bar**

Cage and Cage Material (Select One)

CF8M Stainless steel linear cage***
416 Stainless steel Whisper Trim™ cage***
  316 Stainless steel Whisper Trim cage**
  ENC coated cast iron quick opening cage***

Main Valve Spring (Select One)

Maximum Differential and Spring Color

20 psi / 1.4 bar, Yellow**
  60 psi / 4.1 bar, Green***
  125 psi / 8.6 bar, Blue***
  400 psi / 27.6 bar, Red***

Spring Material (Select One)

Steel
  Inconel® X-750

Actuator Size (Select One)

Type 1098 Size 70, maximum set pressure 
50 psig / 3.4 bar
  Type 1098 Size 40, maximum set pressure 
75 psig / 5.2 bar (standard)
  Type 1098 Size 30, maximum set pressure 
100 psig / 6.9 bar
  Type 1098H Size 30H, maximum set pressure
350 psig / 24.1 bar

Inconel® is a mark owned by Special Metals Corporation.

Type 6352 Pilot

14 in. w.c. to 2 psig / 35 mbar to 0.14 bar***
  2 to 10 psig / 0.14 to 0.69 bar**

Type 6353 Pilot

3 to 40 psig / 0.21 to 2.8 bar**
  35 to 125 psig / 2.4 to 8.6 bar**

Type 6354L Pilot

  85 to 200 psig / 5.9 to 13.8 bar**

Type 6354M Pilot

  175 to 220 psig / 12.1 to 15.2 bar**

Type 6354H Pilot

  200 to 300 psig / 13.8 to 20.7 bar**

Type 61L, 61LD or 61LE Pilot  

Specify Type _______________

7 in. w.c. to 2 psig / 17 mbar to 0.14 bar**
  1 to 5 psig / 0.07 to 0.34 bar**
  2 to 10 psig / 0.14 to 0.69 bar**
  5 to 15 psig / 0.34 to 1.0 bar**
  10 to 20 psig / 0.69 to 1.4 bar**

Type 61H Pilot

  10 to 65 psig / 0.69 to 4.5 bar**

- continued -

22

Ordering Guide (continued) 

Bulletin 71.2:1098-EGR

Type 61HP Pilot

15 to 45 psig / 1.0 to 3.1 bar**
  35 to 100 psig / 2.4 to 6.9 bar**
  100 to 300 psig / 6.9 to 20.7 bar**

Type Y600AM

4 to 8 in. w.c. / 10 to 20 mbar
7 to 16 in. w.c. / 17 to 40 mbar
15 in. w.c. to 1.2 psig / 37 mbar to 0.08 bar

1.2 to 2.5 psig / 0.08 to 0.17 bar

2.5 to 4.5 psig / 0.17 to 0.31 bar

4.5 to 7 psig / 0.31 to 0.48 bar

Liquid Service

  Low gain restriction

6350 Series Pilot Construction (Select One)

Aluminum*** 
  Stainless steel**

Tubing and Fittings (Select One)

Stainless steel tubing and steel plated ttings**
  Stainless steel tubing and ttings**

Main Valve Replacement Parts Kit (Optional)

   Yes, send one replacement parts kit to 

match this order.

Actuator Replacement Parts Kit (Optional)

   Yes, send one replacement parts kit 

to match this order.

Pilot Replacement Parts Kit (Optional)

   Yes, send one replacement parts kit 

to match this order.

Wireless Position Monitor Mounting Kit (Optional)

   Yes, send one mounting kit for mounting the 

Topworx™ 4310 or the Fisher® 4320 wireless
position monitor.

Option

  NACE Construction

Regulators Quick Order Guide

* * * Readily Available for Shipment

* * Allow Additional Time for Shipment

Special Order, Constructed from Non-Stocked Parts.  

*

Consult your local Sales Ofce for Availability.

Availability of the product being ordered is determined by the component with the 
longest shipping time for the requested construction.

Specication Worksheet

  Application:

Specic Use
  Line Size
  Gas Type and Specic Gravity
  Gas Temperature

  Does the Application Require Overpressure Protection?

Yes   No  If yes, which is preferred:

  Relief Valve    Monitor Regulator    Shutoff Device

Is overpressure protection equipment selection assistance 
  desired?

  Pressure:

Maximum Inlet Pressure (P
  Minimum Inlet Pressure (P
  Downstream Pressure Setting(s) (P2)
  Maximum Flow (Q

  Performance Required:

Accuracy Requirements?
  Need for Extremely Fast Response?

  Other Requirements: 

max

)

1max

1min

)

)

23

Bulletin 71.2:1098-EGR

Industrial Regulators

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]

Asia-Pacic

Shanghai 201206, China
Tel: [phone]

Europe
Bologna 40013, Italy
Tel: [phone]

Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]

For further information visit www.emersonprocess.com/regulators

The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls International LLC,
a business of Emerson Process Management.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or

guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications of such

products at any time without notice.

Emerson Process Management Regulator Technologies, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and
maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.

Natural Gas Technologies

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]

Asia-Pacic

Singapore 128461, Singapore
Tel: [phone]

Europe
Bologna 40013, Italy
Tel: [phone]
Chartres 28008, France
Tel: [phone]

Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]

TESCOM

Emerson Process Management
Tescom Corporation

USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tels: [phone]
[phone]

Europe
Selmsdorf 23923, Germany
Tel: [phone]

Asia-Pacic

Shanghai 201206, China
Tel: [phone]

©Emerson Process Management Regulator Technologies, Inc., 2001, 2015; All Rights Reserved