Emerson 98 Data Sheet

Bulletin 71.4:98

98 Series Backpressure Regulators
and Relief Valves

W6155

TYPE 98H

W6157

TYPE 98LD

November 2009

W6158

TYPE 98HD

Figure 1. Typical 98 Relief Valves

Introduction

The 98 Series (Figure 1) is used for backpressure
or relief applications in liquid, gas, air, and steam
service. The Types 98L, 98H, and 98HH are direct­operated and spring-loaded. The Types 98LD and
98HD use additional pressure loading to maintain relief
differential pressures, backpressures or for remote
setpoint adjustment.

The Type 98HM is a direct-operated, spring to close
regulator for backpressure or relief applications in
liquid, gas, or steam service. The regulator requires
no external power to operate and features a sensing
line connection for sensing pressure externally from
the regulator. A seal washer for the set screw can be
included when applications require pressure loading
of the spring case (not available on NPS 1-1/2 and 2
bodies (DN 40 and 50)).

Using a Type 98HM as a relief valve does not
exclude the installation of an ASME certied
full ow valve as specied by local codes and
regulations or system design.

W6156

TYPE 98L

Features

• Versatility—Typical applications include

backpressure on pumps, maintaining differential
pressure across lubricated seals, steam header
pressure, fuel and oil lines, air supply systems,
pump bypass applications for API general and
special purpose lube and seal oil systems, relief

applications for ash tanks and accumulators, and

other process and industrial uses.

• Excellent Fluid Compatibility—Diaphragms come
in stainless steel, Monel®, Hastelloy® C, or elastomers,
and body is available in cast iron and steel as well as
stainless steel, Hastelloy® C, and Monel®. Corrosion­ resistant trims are available.

• Close, Stable Regulation—Diaphragm is isolated

from the main ow stream. Slotted valve plug and

pusher post assembly provides positive guiding for
improved shutoff.

• Compact Design—Small size allows easy
installation in limited spaces.

Hastelloy® C is a mark owned by Haynes International, Inc.
Monel® is a mark owned by Special Metals Corporation.

D100153X012

www.sherregulators.com

Bulletin 71.4:98

Specications

Available Constructions
Type 98L: Direct-operated low-pressure

backpressure/relief valve with internal pressure
registration and standard adjusting screw for
2 to 38 psig (0,14 to 2,6 bar) set pressure range

Type 98LD: Pressure-loaded low-pressure
backpressure/relief valve with internal pressure
registration and handwheel adjustment for 2 to 38 psi
(0,14 to 2,6 bar) differential set pressure range

Type 98H: Direct-operated high-pressure
backpressure/relief valve with internal pressure
registration and standard adjusting screw for
5 to 200 psig (0,35 to 13,8 bar) set pressure range

Type 98HD: Pressure-loaded low-pressure
backpressure/relief valve with internal pressure
registration and handwheel adjustment for
5 to 200 psi (0,35 to 13,8 bar) differential set
pressure range

Type 98HH: Direct-operated high-pressure
backpressure/relief valve with internal pressure
registration and standard adjusting screw for 150 to
375 psig (10,3 to 25,9 bar) set pressure range

Type 98HHD: Pressure-loaded high-pressure
backpressure/relief valve with internal pressure
registration and handwheel adjustment for
150 to 375 psi (10,3 to 25,9 bar) differential set
pressure range

Type 98HM: Direct-operated high-pressure
backpressure/relief valve with external pressure
registration and standard adjusting screw for 5 to
275 psig (0,35 to 19,0 bar) set pressure range

Body Sizes and End Connection Styles

BODY MATERIAL

TYPES

98L and 98LD 1/4, 1/2, 3/4, 1 NPT

98H and 98HD

98HM

98HH, 98HHD

Cast Iron

1/4, 1/2, 3/4, 1,

1-1/2, 2 NPT

- - - - 1/2, 3/4, 1, 1-1/2, 2 NPT
1/4, 1/2, 3/4, 1 NPT

WCC Steel,

CF8M Stainless steel,

Hastelloy

NPS 1/2 through 1 SWE,

NPS 1/2 through 2 SWE,

CL150 RF, CL300 RF,

®

C, Monel

1/4 through 1 NPT,

CL150RF, CL300RF,

PN 16/25/40 RF

1/4 through 2 NPT,

PN 16/25/40 RF

®

Construction Materials

BODY SPRING CASE

Cast iron, WCC Steel, CF8M

Stainless steel, Monel

Hastelloy® C

®

, or

Cast iron, WCC Steel, or

CF8M Stainless steel

Trim Materials

See Table 1

Maximum Cold Working Pressures of Body Size
and Material

REGULATOR

Type 98L All Sizes

Type 98LD All Sizes

Type 98H All Sizes

Type 98HD All Sizes

Type 98HH,

98HHD

Type 98HM All Sizes

(1)(3)

BODY

SIZE

All Sizes

BODY AND

SPRING CASE

MATERIALS

Cast Iron

Steel

Stainless Steel

Cast Iron

Steel

Stainless Steel

Cast Iron

Steel

Stainless Steel

Cast Iron

Steel

Stainless Steel

Cast Iron

Steel

Stainless Steel

Steel

Stainless Steel

MAXIMUM INLET

PRESSURE

PSIG (bar)

150 (10,3)
150 (10,3)

300 (20,7)
300 (20,7)
300 (20,7)

300 (20,7)
400 (27,6)
400 (27,6)

400 (27,6)
400 (27,6)
400 (27,6)

300 (20,7)
300 (20,7)

(2)(4)

60 (4,1)
125 (8,6)
125 (8,6)

60 (4,1)

Relief Pressure Ranges

See Table 2

Temperature Capabilities for Elastomer Parts

MATERIAL TEMPERATURE RANGE

Nitrile (NBR) -40° to 180°F (-40° to 82°C)

Neoprene (CR) -40° to 180°F (-40° to 82°C)

Fluorocarbon (FKM)

Ethylenepropylene (EPDM)

Peruoroelastomer (FFKM)

Polytetrauoroethylene (PTFE)

Diaphragm protector

(6)

(6)

(6)

(6)

0° to 300°F (-18° to 149°C)

Limited to 200°F (93°C) for hot water

-40° to 275°F (-40° to 135°C)

0° to 425°F (-18° to 218°C)

-40° to 400°F (-40° to 204°C)

(1)(5)

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

2. Loading pressure plus spring setting should not exceed maximum inlet pressure.

3. Temperature and/or the body end connection may decrease these maximum pressures.

4. Maximum inlet pressure equals set pressure plus build-up.

5. Pressure and/or the body end connection may decrease these maximum temperatures.

6. Not for use on steam service.

7. Not available for Type 98HM.

2

Specications (continued)

Bulletin 71.4:98

Temperature Capabilities for Metal Parts

MATERIAL TEMPERATURE RANGE

(7)

Cast Iron

WCC Steel -20° to 450°F (-29° to 232°C)

CF8M Stainless steel, Monel

Hastelloy

®

C

®

, or

-40° to 406°F (-40° to 208°C)

-40° to 450°F (-40° to 232°C)

(1)(5)

Maximum Spring Case Loading Pressure for
Types 98LD and 98HD (Spring Setting Plus
Loading Pressure)

(1)(2)

Type 98LD Spring Case
Cast Iron: 50 psig (3,4 bar)
Steel or Stainless steel: 125 psig (8,6 bar)
Type 98HD Spring Case
Cast Iron: 235 psig (16,2 bar)
Steel or Stainless steel: 300 psig (20,7 bar)

Type 98HHD Spring Case

Cast Iron: 250 psig (17,2 bar)
Steel or Stainless steel: 250 psig (17,2 bar)

Shutoff Classication Per ANSI/FCI 70-3-2004
Metal Seats: Class IV

PTFE: Class IV
Elastomer Seats: Class VI

Flow Coefcient
C1: 35

Type 98HM Sensing Line Connection
1/2, 1-1/2, or 2 NPT body: 1/8 NPT
3/4 or 1 NPT body: 1/4 NPT

IEC Sizing Coefcients

BODY SIZES,

NPS (DN)

1/4

1/2 (15) 0.83 0.69

3/4 and 1

(20 and 25)

1-1/2 and 2
(40 and 50)

Capacities
Types 98L and 98LD: See Tables 3 through 7

Types 98H and 98HD: See Tables 8 through 12
Type 98HH and 98HHD: See Tables 13 through 17
Type 98HM: See Tables 18 through 21

Options

• Handwheel or tee handle for Types 98L, 98H,

and 98HH

• Tapped spring case vent for Types 98L, 98H,

98HH, and 98HM

• Seal washer to permit spring case pressure

loading for Types 98L, 98H, 95HH, and 98HM

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

2. Loading pressure plus spring setting should not exceed maximum inlet pressure.

5. Pressure and/or the body end connection may decrease these maximum temperatures.

7. Not available for Type 98HM.

X

T

0.78 0.50

F

D

F

L

0.91 0.83

0.88 0.77

0.92 0.85

K

m

• Differential Pressure Capability—Spring-loaded

PTFE packing and tapped connections permit
pressure loading of Types 98LD and 98HD
spring cases.

• Handwheels—Handwheels (standard on the
Types 98LD and 98HD and optional on some
sizes of the Types 98L and 98H) allow easy
pressure setting changes.

• Sour Gas Service Capability—Optional
materials are available for applications handling
sour gases. These constructions comply with
the recommendations of NACE International
Standards MR0175 and MR0103.

Principle of Operation

Relief or backpressure valves respond to changes in
upstream pressure. Pressure changes register under
the diaphragm (see Figure 2) through a registration

hole in the valve body (through upstream sensing
line connection for Type 98HM). When the pressure
increases beyond the spring setting, the diaphragm
pressure overcomes the spring compression. This

causes the valve plug to move away from the orice.
The ow line through the valve is open and excess

pressure is vented. When upstream pressure drops
back to normal, the valve resumes its closed position.

The chart in Figure 3 illustrates the operation of an
NPS 1/2 (DN 15) body used in air service. As the

inlet pressure increases, initial ow occurs at the

bubble point of 10.5 psig (0,72 bar). Flow increases
with further rises in the inlet pressure, reaching
500 SCFH (13,4 Nm3/h) at the relief pressure setting
of 12 psig (0,83 bar). Greater capacities are obtained
with higher build-ups over the relief pressure setting,
as shown in the capacity tables.

When the inlet pressure decreases, ow decreases until

the valve reseals to reseat point of 9 psig (0,62 bar).

3

Bulletin 71.4:98

METAL DIAPHRAGMS

SPRING

REGISTRATION
HOLE

ORIFICE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

A6925

GASKET

DIAPHRAGM

FOR TYPE 98H WITH TWO METAL DIAPHRAGMS

VALVE PLUG

COMP

O-RING SEAT

(ALSO TYPICAL OF 98HH AND 98L EXCEPT FOR

TYPE 98L, 1/4 NPT, 2 TO 7 PSI (0,14 TO 0,48 bar) RANGE)

SPRING

GASKET

TYPE 98L (1/4 NPT, 2 TO 7 PSI (0,14 TO 0,48 bar) RANGE)

WITH ONE METAL DIAPHRAGM

METAL DIAPHRAGMS

TYPE 98H (ALSO TYPICAL OF 98L AND 98HH)

HANDWHEEL

CONTROL SPRING

VALVE PLUG GUIDE

INLET PRESSURE

OUTLET PRESSURE

LOADING PRESSURE

M1005

Figure 2. 98 Series Operational Schematic

4

SPRING

FOR TYPE 98HD/LD/HHD WITH TWO METAL DIAPHRAGMS,

ASSEMBLE DIAPHRAGM GASKETS UNDER AND ABOVE

THE METAL DIAPHRAGMS AS SHOWN ABOVE

TYPE 98HD (ALSO TYPICAL OF 98LD AND 98HHD)

METAL DIAPHRAGMS

GASKET

M1155

TO UPSTREAM
SENSING LINE

Type 98HM

SPRING

Bulletin 71.4:98

METAL DIAPHRAGMS

TO UPSTREAM
SENSING LINE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

M1155

TYPE 98HM

Figure 2. 98 Series Operational Schematic (continued)

Once the valve has resealed, leakage will not occur
again until the bubble point pressure of 10.5 psig
(0,72 bar) is reached.

Table 22 shows typical pressure differences between
the relief pressure setting and the bubble point, and
between the relief pressure setting and the reseat
point. These differences are to be used in conjunction
with the capacity tables to determine the total inlet
pressure increase required to develop the tabulated

ows and to determine the actual inlet pressure

reductions required for reseat point.

Capacity Information

GASKET

FOR TYPE 98HM WITH TWO METAL DIAPHRAGMS,

ASSEMBLE DIAPHRAGM GASKETS UNDER AND ABOVE

THE METAL DIAPHRAGMS AS SHOWN ABOVE

Then, if capacity is desired in normal cubic meters per
hour at 0°C and 1,01325 bar, multiply SFCH by 0.0168.

Typical relieving capacities in pounds per hour and
kilogram per hour of saturated steam are shown in
Tables 5, 10, and 15.

Tables 3, 4, 8, 9, 13, 14, 20, and 21 gives relieving
capacities in U.S. gallons per minute and in liters per
minute of water.

Sizing

Determine Flow Rates for units used as differential relief
valves as follows:

Relieving capacities at selected pressures and outlet

pressure ows are given in SCFH (60°F and 14.7 psia)

of air in Tables 6, 7, 11, 12, 16, 17, 18, and 19. To
determine the equivalent capacities for other gases,
multiply the table capacities by the following appropriate

conversion factors: 1.29 for 0.6 specic gravity natural

gas, 0.808 for propane, 0.707 for butane, or 1.018 for

nitrogen. For gases of other specic gravities, divide by
the square root of the appropriate specic gravity.

Air and Steam Service

When the Capacity Information section do not cover
the actual service conditions, it will be necessary to

calculate the ow rate available from the relief valve.

Step 1.

From the Capacity Information section determine a

ow rate using the closest available data for setpoint

5

Bulletin 71.4:98

and build-up. With this information, calculate a ow
coefcient using the following:

Equation 1:

Q

=

C

g

520

GT

P1aSIN

3417

)

C

∆P

DEG

P

)

1a

1

Cg = Calculated Flow coefcient

Q = Flow rate from tables (SCFH)

P

= Inlet pressure from table (set pressure and

1a

build-up) converted to absolute pressure

G = Specic gravity

T = Absolute temperature of gas at inlet
degrees Rankine = °F + 460

P1 = Absolute inlet pressure, psia = psig + 14.7

C1 = 35

∆P = P1 - P2, psid

Calculate the Cg coefcient for the setting and build-up

nearest to the desired service conditions within the
selected spring range. Then use this Cg to calculate

the approximate ow available for the actual setpoint

and build-up desired. Available Cg will vary based
upon setpoint, differential pressure, build-up, and
spring range.

Step 2.

Calculate the actual ow rate available using the
coefcient from Step 1 and the actual inlet pressure

(setpoint plus build-up) and actual outlet pressure
(if not atmospheric).

16 (1,1)

14 (0,97)

12 (0,83)

10.5 (0,72)
10 (0,69)

9 (0,62)

8 (0,55)

INLET PRESSURE, PSIG (bar)

6 (0,41)

A1309-1

Figure 3. Typical Bubble Point and Reseat Point Performance

BUBBLE

POINT

TIGHT
SHUTOFF
POINT

0

AIR FLOW, STANDARD CUBIC FEET PER HOUR (Nm3/h)

500 (13,4) 1000 (26,8) 1500 (40,2)

and

12 PSIG (0,83 bar) RELIEF
SETTING 500 SCFH (13,4 Nm3/h)
FLOW AT RELIEF SETTING
NPS 1/2 (DN 15) TYPE 98L

INCREASING INLET PRESSUREand

DECREASING INLET PRESSURE

From Table 11, select NPS 3/4 or 1 (DN 20 or 25)
body, red spring for 100 psi (6,9 bar) setpoint, and

10 psi (0,69 bar) build-up. The Type 98H will ow

13 000 SCFH (348 Nm3/h) air.

Calculate Cg for these table conditions using Equation 1:

P1 = 100 psig (6,9 bar) + 10 psig (0,69 bar)
build-up = 110 psig or 124.7 psia
(7,6 bar g or 8,6 bar a)

∆P = P1 - P2 = 110 psid (7,6 bar d)

Q = 13 000 SCFH (348 Nm3/h)

C1 = 35

Answer from Equation 1, Cg = 104*

Equation 2:

Q

SCFH

520

=

CgP1aSIN

GT

3417

)

C

∆P

DEG

P

)

1a

1

Example 1.

Service Conditions:

Setpoint, 115 psi (7,9 bar)
Build-up allowed, 10 psi (0,69 bar)
Outlet discharges to atmosphere
Require 13 200 SCFH (354 Nm3/h)

air ow rate

6

*Since build-up relates to travel, this coefcient is

valid for all pressure settings on the spring used in the
calculation whenever the build-up is 10 psi (0,69 bar).

Now, solve for actual ow, Q, from the original service

conditions using Equation 2:

P1 = 115 psig (7,9 bar) + 10 psig (0,69 bar)
build-up = 125 psig or 139.7 psia
(8,6 bar or 9,6 bar a)

P2 = 0, therefore P = P1 - P2 =
125 psig (8,6 bar) - 0 = 125 psid (8,6 bar d)

Cg = 104 (from above)

C1 = 35

Bulletin 71.4:98

Answer from Equation 2, Q = 14 500 SCFH
(389 Nm3/h) rated capacity. Since this capacity is
greater than the 13 200 SCFH (354 Nm3/h) required,
the relief valve may be used or the calculation could be
repeated to try for a smaller body size.

Example 2.

Service Conditions:

Setpoint, 165 psi (11,4 bar)
Build-up allowed, 10 psi (0,69 bar)
Outlet discharges into pressured system of
50 psi (3,4 bar)
Require 3000 SCFH (80,4 Nm3/h) air ow rate

From Table 11, select NPS 3/4 or 1 (DN 20 or 25)
body, blue spring. For 150 psi (10,3 bar) setpoint and

10 psi (0,69 bar) build-up, the Type 98H will ow

9000 SCFH (241 Nm3/h) air.

Calculate Cg for these table conditions using Equation 1:

P1 (inlet) = 150 psig (10,3 bar) + 10 psig
(0,69 bar) build-up = 160 psig or

174.7 psia (11,0 bar g or 12,0 bar a)

∆P = P1 - P2 = 160 psig (11,0 bar) - 0 =

160 psid (11,0 bar d)

Q = 9000 SCFH (241 Nm3/h)

C

1

= 35

Answer from Equation 2, Q = 9500 SCFH (255 Nm3/h)
rated capacity. Since this capacity is greater than the
3000 SCFH (80,4 Nm3/h) required, the relief valve may
be used or the calculation could be repeated to try for a
smaller body size.

Liquid Sizing for Liquids Other than Water

Step 1.

Determine Cv at build-up conditions of application.

Cv =

Q = Flow in GPM from capacity tables

∆P = Pressure drop in psi (setpoint and build-up)

Cv = Valve sizing coefcient

Q

∆P

Step 2.

To determine ow rate for liquids other than
water or ow rate for differential relief service:

Q = Cv ∆P/G

G = Specic gravity of uid

Answer from Equation 1, Cg = 51.5*

*Since build-up relates to travel, this coefcient is

valid for all pressure settings on the spring used in the
calculation whenever the build-up is 10 psi (0,69 bar).

Now, solve for actual ow, Q, from the original service

conditions using Equation 2:

P1 = 165 psig (11,4 bar) + 10 psig (0,69 bar)
build-up = 175 psig or 189.7 psia
(12,1 bar g or 13,1 bar a)

∆P = P1 - P2 = 170 psig (11,7 bar) - 50 psig

(3,4 bar) = 120 psid (8,3 bar d)

Cg = 51.5 (from above)

C1 = 35

Maximum Allowable Pressure Drop for
Liquid Service

Pressure drops in excess of allowable will result in

choked ow and possible cavitation damage.

To determine maximum allowable pressure drop
for water:

∆P(allow) = Km (P1)

∆P = Valve differential - PSI

K

m

P1 = Valve inlet pressure psig

To determine maximum allowable pressure drop for

uids other than water, see Fisher® Catalog 10.

= Valve recovery coefcient from table

7

Bulletin 71.4:98

Table 1. Trim Materials

ELASTOMER SEAT STANDARD OPTIONAL

Orice

O-ring retainer

Valve plug

Valve plug guide

Pusher post

Diaphragm retaining washer

Diaphragm

O-ring seat

METAL SEAT STANDARD OPTIONAL

Orice

Valve plug

Valve plug guide

Pusher post

Diaphragm

Diaphragm retaining washer

1. Available for Type 98HM only.

2. Two metal diaphragms will be used except only for Type 98L, 1/4 NPT, 2 to 7 psi (0,14 to 0,48 bar) range which uses only one metal diaphragm (see Figure 2 for assembly reference).

3. Two diaphragms will be used if elastomer diaphragm is Fluorocarbon (FKM)

Table 2. Spring Ranges for Relief or Differential Relief Pressures

416 Stainless steel
416 Stainless steel
416 Stainless steel
416 Stainless steel
416 Stainless steel
316 Stainless steel

Neoprene (CR)

Nitrile (NBR)

416 Stainless steel, hardened
416 Stainless steel, hardened

416 Stainless steel
416 Stainless steel

302 Stainless steel

(2)

Not used

316 Stainless steel
316 Stainless steel
316 Stainless steel
316 Stainless steel
316 Stainless steel
302 Stainless steel

Fluorocarbon (FKM)

PTFE protector available; 302 Stainless steel

(3)

or Ethyleneproplylene (EPDM);

(2)

Fluorocarbon (FKM), Ethyleneproplylene EPDM, Peruoroelastomer (FFKM)

316 Stainless steel, Hastelloy® C, Monel
316 Stainless steel, Hastelloy® C, Monel
316 Stainless steel, Hastelloy® C, Monel
316 Stainless steel, Hastelloy® C, Monel

Neoprene (CR), Fluorocarbon (FKM)

(3)

, PTFE protector available , Hastelloy® C, Monel

®

®

®

®

302 Stainless steel

(1)

®

BODY SIZES,

NPS (DN)

RELIEF SET PRESSURE RANGE

Type 98L or 98LD Type 98H, 98HD, or 98HM Type 98HH or 98HHD

(1)

, PSIG OR PSI (bar)

SPRING PART NUMBER SPRING COLOR

2 to 7 (0,14 to 0,48 bar) 15 to 35 (1,0 to 2,4 bar) - - - - 1E392527022 Yellow

6 to 14 (0,41 to 0,97 bar) 25 to 75 (1,7 to 5,2 bar) - - - - 1E392627012 Green

(2)

1/4

12 to 25 (0,83 to 1,7 bar) 70 to 140 (4,8 to 9,7 bar) - - - - 1E392727142 Red

20 to 38 (1,4 to 2,6 bar) 130 to 200 (9,0 to 13,8 bar) - - - - 1L346127142 Blue

- - - - - - - - 150 to 375 (10,3 to 25,9) 1N942227142 Light Gray

2 to 7 (0,14 to 0,48 bar) 15 to 35 (1,0 to 2,4 bar) - - - - 1E395627022 Yellow

6 to 14 (0,41 to 0,97 bar) 25 to 75 (1,7 to 5,2 bar) - - - - 1D7455T0012 Green

12 to 25 (0,83 to 1,7 bar) 70 to 140 (4,8 to 9,7 bar) - - - - 1E395727192 Red

1/2 (15)

20 to 38 (1,4 to 2,6 bar) 130 to 200 (9,0 to 13,8 bar) - - - - 1L380027142 Blue

- - - - 15 to 100

- - - - 100 to 275

(3)

(1,0 to 6,9 bar) - - - - 14B9943X012 Unpainted

(3)

(6,9 to 19,0 bar) - - - - 14B9942X022 Unpainted

- - - - - - - - 150 to 375 (10,3 to 25,9) 1N943427142 Light Gray

2 to 7 (0,14 to 0,48 bar) 15 to 35 (1,0 to 2,4 bar) - - - - 1E398927022 Yellow

6 to 14 (0,41 to 0,97 bar) 25 to 75 (1,7 to 5,2 bar) - - - - 1E399027142 Green

12 to 25 (0,83 to 1,7 bar) 70 to 140 (4,8 to 9,7 bar) - - - - 1E399127162 Red

3/4, 1

(20, 25)

20 to 38 (1,4 to 2,6 bar) 130 to 200 (9,0 to 13,8 bar) - - - - 1L380127082 Blue

- - - - 15 to 100

- - - - 100 to 275

(3)

(1,0 to 6,9 bar) - - - - 14B9944X022 Unpainted

(3)

(6,9 to 19,0 bar) - - - - 14B9945X022 Unpainted

- - - - - - - - 150 to 375 (10,3 to 25,9) 1N944127182 Black Stripe

- - - - 5 to 35 (0,34 to 2,4 bar) - - - - 1E792327092 Dark Gray

1-1/2, 2
(40, 50)

- - - - 20 to 65 (1,4 to 4,5 bar) - - - - 1E795327082 Light Blue

- - - - 50 to 100 (3,4 to 6,9 bar) - - - - 1E795427082 Light Gray

- - - - 80 to 170 (5,5 to 11,7 bar) - - - - 1P788827082 Black

1. All springs may be backed off to 0 psig (0 bar). However, highest capacities and best performances are obtained by using these springs in their recommended ranges. Psi rather
than psig are used for differential relief constructions.

2. Not available for Type 98HM.

3. Only available for Type 98HM. Stainless steel construction.

8

Bulletin 71.4:98

Table 3. Water Relief Capacities in Gallons per Minute (l/min), Types 98L and 98LD with Elastomer Diaphragm

NOMINAL

BODY
SIZES,

NPS (DN)

1/4

1/2 (15)

3/4, 1

(20, 25)

SPRING

Part Number

1E392527022 Yellow

1E392627012 Green

1E392727142 Red

1L346127142 Blue

1E395627022 Yellow

1D7455T0012 Green

1E395727192 Red

1L380027142 Blue

1E398927022 Yellow

1E399027142 Green

1E399127162 Red

1L380127082 Blue

Color
Code

RELIEF

PRESSURE

SETTING,

PSIG (bar)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

FLOW AT

RELIEF

SETTING,

GPM

(l/min)

0.7

(2,7)

0.7

(2,7)

2.2

(8,3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

2.2

(8,3)

2.2

(8,3)

2.2

(8.3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

2.2

(8,3)

2.2

(8,3)

2.2

(8.3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)

2

(0,14)4(0,28)6(0,41)8(0,55)10(0,69)15(1,0)20(1,4)25(1,7)30(2,1)

2.1

(8,0)

2.9

(11,0)

3.5

(13,2)

3.1

(11,7)

3.3

(12,5)

3.5

(13,2)

3.4

(12,9)

3.8

(14,4)

4.2

(15,9)

5.2

(19,7)

(22,7)

6.7

(25,4)

4.5

(17,0)

(18,9)

5.5

(20,8)

4.2

(15,9)

4.5

(17,0)

4.7

(17,8)

15

(56,8)

15.5

(58,7)

16.5

(62,5)

14

(53,0)

16.5

(62,5)

17.5

(66,2)

10

(37,9)

11

(41,6)

19.5

(73,8)

6

5

2.6

(9,8)

3.3

(12,5)

4.5

(17,0)5(18,9)

4.3

(16,3)

4.8

(18,2)

5.3

(20,1)

4.7

(17,8)

5.2

(19,7)

5.6

(21,2)

7.5

(28,4)

8.2

(31,0)

8.5

(32,2)10(37,9)

6.7

(25,4)

7.7

(29,1)

8.2

(31,0)

7

(26,5)

7.5

(28,4)

8

(30,3)

18.5

(70,0)

19

(71,9)

21.5

(81,4)

21

(79,5)

24

(90,8)

25.5

(96,5)

20

(75,7)

24

(90,8)

30

(114)

3

(11,4)

3.7

(14,0)

5

(18,9)

5.7

(21,6)

6.1

(23,1)

5.5

(20,8)

6

(22,7)

6.5

(24,6)

8.5

(32,2)

9.2

(34,8)

9.2

(34,8)

10.5

(39,7)

11.5

(43,5)

9.7

(36,7)

10.2

(38,6)

10.7

(40,5)

20

(75,7)

21

(79,5)

24.5

(92,7)

25.5

(96,5)

28.5

(108)

30.5

(115)

25

(94,6)

30

(114)

34.5

(131)

3.4

(12,9)

4.1

(15,5)

5.3

(20,1)

5.5

(20,8)

6.1

(23,1)

6.5

(24,6)

6.1

(23,1)

6.7

(25,4)

7

(26,5)

9.5

(36,0)

10.2

(38,6)

11.5

(43,5)

11.2

(42,4)

12.5

(47,3)

13.2

(50,0)

12

(45,4)

12.5

(47,3)

13

(49,2)

22.5

(85,2)

23

(87,1)

26.5

(100)

28

(106)

30.5

(115)

33

(125)

29

(110)

33.5

(127)

36.5

(138)

3.8

(14,4)

4.5

(17,0)

5.5

(20,8)

6

(22,7)

6.3

(23,8)

6.7

(25,4)

6.6

(25,0)

7.2

(27,3)

7.4

(28,0)

10.2

(38,6)

11.2

(42,4)

12.5

(47,3)

12.6

(47,7)

13.7

(51,9)

14.5

(54,9)

13.5

(51,1)

14

(53,0)

14.7

(55,6)

24

(90,8)

24.5

(92,7)

27.5

(104)

30

(114)

32

(121)

34

(129)

32

(121)

35.5

(134)

38

(144)

4.5

(17,0)

5.2

(19,7)

5.9

(22,3)

6.4

(24,2)

6.7

(25,4)

7.1

(26,9)

7.2

(27,3)

7.6

(28,8)

8

(30,3)

12.1

(45,8)

12.9

(48,8)

14.2

(53,7)

15

(56,8)

16.2

(61,3)

16.5

(62,5)

16.2

(61,3)

16.7

(63,2)

17.5

(66,2)

28.6

(108)

28.9

(109)

29.5

(112)

32

(121)

34

(129)

36

(136)

36

(136)

38

(144)

40

(151)

5.2

(19,7)

5.8

(22,0)

6.5

(24,6)

6.9

(26,1)

7

(26,5)

7.5

(28,4)

7.6

(28,8)

8

(30,3)

8.4

(31,8)

13.8

(52,2)

14.5

(54,9)

15.6

(59,0)

16.2

(61,3)

17.7

(67,0)

18.2

(68,9)

18.2

(68,9)

18.7

(70,8)

19.5

(73,8)

32.5

(123)

33.5

(127)

32.3

(122)

34.6

(131)

36

(136)

38

(144)

38

(144)

40

(151)

42

(159)

5.7

(21,6)

6.4

(24,2)

7.0

(26,5)

7.4

(28,0)

7.4

(28,0)

7.9

(29,9)

8

(30,3)

8.4

(31,8)

8.7

(32,9)

15.3

(57,9)

15.8

(59,8)

16.8

(63,6)

17.3

(65,5)

18.8

(71,2)

19.5

(73,8)

19.5

(73,8)

20

(75,7)

21.5

(81,4)

36.0

(136)

36.7

(139)

34.9

(132)

36.9

(140)

38.2

(145)

40

(151)

40

(151)

42

(159)

44

(167)

6.2

(23,5)

6.9

(26,1)

7.5

(28,4)

7.8

(29,5)

7.8

(29,5)

8.3

(31,4)

8.4

(31,8)

8.5

(32,2)

9.2

(34,8)

16.6

(62,8)

17.1

(64,7)

18.0

(68,1)

18.4

(69,6)

19.9

(75,3)

20.4

(77,2)

20.5

(77,6)

21

(79,5)

21.2

(80,2)

39.2

(148)

39.6

(150)

37.3

(141)

39.2

(148)

40.2

(152)

42.0

(159)

42.0

(159)

44

(167)

51

(193)

9

Bulletin 71.4:98

Table 4. Water Relief Capacities in Gallons per Minute (l/min), Types 98L and 98LD with Metal Diaphragm

NOMINAL

BODY
SIZES,

NPS (DN)

1/4

1/2 (15)

3/4, 1

(20, 25)

SPRING

Part Number

1E392527022 Yellow

1E392627012 Green

1E392727142 Red

1L346127142 Blue

1E395627022 Yellow

1D7455T0012 Green

1E395727192 Red

1L380027142 Blue

1E398927022 Yellow

1E399027142 Green

1E399127162 Red

1L380127082 Blue

Color
Code

RELIEF

PRESSURE

SETTING,

PSIG (bar)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

FLOW AT

RELIEF

SETTING,

GPM

(l/min)

0.7

(2,7)

0.7

(2,7)

2.2

(8,3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

2.2

(8,3)

2.2

(8,3)

2.2

(8.3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

2.2

(8,3)

2.2

(8,3)

2.2

(8.3)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

1.8

(6,8)

PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)

2

(0,14)4(0,28)6(0,41)8(0,55)10(0,69)15(1,0)20(1,4)25(1,7)30(2,1)

1.2

(4,5)

1.3

(4,9)

3.4

(12,9)4 (15,1)

(11,4)

3.1

(11,7)

3.3

(12,5)

2.6

(9,8)

3.1

(11,7)

3.2

(12,1)

3.7

(14,0)

4.7

(17,8)

3.8

(14,4)

4.2

(15,9)

4.7

(17,8)

(18,9)

3.5

(13,2)

(15,1)

4.5

(17,0)

13

(49,2)

14.7

(55,6)

11.5

(43,5)

(18,9)

5.2

(19,7)

5.5

(20,8)

2.5

(9,5)

(11,4)

5.2

(19,7)

1.8

(6,8)

2.1

(8,0)

3

3.9

(14,8)

(15,1)

4.3

(16,3)

3.7

(14,0)

4.1

(15,5)

4.4

(16,7)

(22,7)

6.2

(23,5)

5.5

(20,8)

6.2

(23,5)

(26,5)

5

7.5

(28,4)

5.7

(21,6)

4

6.5

(24,6)

7.2

(27,3)

16.5

(62,5)

18.2

(68,9)

17.5

(66,2)

5

3

14

(53,0)

15

(56,8)

18

(68,1)

7.5

(28,4)

(34,1)

11.5

(43,5)

4

6

7

9

2.5

(9,5)

3.0

(11,4)

4.5

(17,0)

4.5

(17,0)

4.6

(17,4)

5.1

(19,3)

4.5

(17,0)

4.9

(18,5)

5.3

(20,1)

7.2

(27,3)

(30,3)

7.5

(28,4)9 (34,1)

7.5

(28,4)

8.5

(32,2)

9.2

(34,8)

7.5

(28,4)

8.5

(32,2)

9.5

(36,0)

18.5

(70,0)

20

(75,7)

20.2

(76,5)

18.5

(70,0)

20

(75,7)

23.5

(88,9)

12.5

(47,3)

14

(53,0)

16.5

(62,5)

8

3.0

(11,4)

3.5

(13,2)

4.8

(18,2)

5

(18,9)

5.2

(19,7)

5.7

(21,6)

5

(18,9)

5.5

(20,8)

6

(22,7)

8.2

(31,0)

9.2

(34,8)

8.7

(32,9)

9.7

(36,7)

10.7

(40,5)

9.2

(34,8)

10.1

(38,2)

11

(41,6)

19.5

(73,8)

21

(79,5)

20.5

(77,6)24 (90,8)

21

(79,5)

23.5

(88,9)

26.5

(100)

17

(64,3)

18

(68,1)

21.5

(81,4)

3.3

(12,5)

3.8

(14,4)

5.1

(19,3)

5.4

(20,4)

5.5

(20,8)

6.1

(23,1)

5.5

(20,8)

6

(22,7)

6.5

(24,6)

9.2

(34,8)

10.2

(38,6)

10.5

(39,7)

9.7

(36,7)

10.7

(40,5)

12

(45,4)

10.2

(38,6)

11.2

(42,4)

12.2

(46,2)

20.5

(77,6)

22

(83,3)

23.5

(88,9)

26

(98,4)

29

(110)

20

(75,7)

22

(83,3)

25

(94,6)

3.9

(14,8)

4.4

(16,7)

5.5

(20,8)

5.8

(22,0)

6.3

(23,8)

6.7

(25,4)

6.5

(24,6)

7

(26,5)

7.5

(28,4)

11.0

(41,6)

11.8

(44,7)

13

(49,2)

11.5

(43,5)

12.7

(48,1)

14

(53,0)

12.7

(48,1)

14

(53,0)

15.5

(58,7)

24.4

(93,4)

25.4

(96,1)

26.5

(100)

27.5

(104)

30

(114)

32

(121)

26

(98,4)

27.5

(104)

31.5

(119)

4.5

(17,0)

4.9

(18,5)

6.0

(22,7)

6.3

(23,8)

6.7

(25,4)

7.1

(26,9)

7.1

(26,9)

7.5

(28,4)

7.9

(29,9)

12.5

(47,3)

13.2

(50,0)

14.2

(53,7)

12.4

(46,9)

14

(53,0)

15

(56,8)

14.7

(55,6)

16

(60,6)

17.2

(65,1)

27.8

(105)

28.4

(107)

29.0

(110)

29.7

(112)

31.5

(119)

33.5

(127)

30.5

(115)

32

(121)

36

(136)

4.9

(18,5)

5.4

(20,4)

6.5

(24,6)

6.7

(25,4)

7.1

(26,9)

7.5

(28,4)

7.5

(28,4)

7.9

(29,9)

8.3

(31,4)

13.8

(52,2)

14.4

(54,5)

15.4

(58,3)

13.3

(50,3)

14.8

(56,0)

16.2

(61,3)

16.2

(61,3)

17.2

(65,1)

18.2

(68,9)

30.8

(117)

31.1

(118)

31.4

(119)

31.7

(120)

33.4

(126)

35.5

(134)

34.5

(131)

37.5

(142)

39.5

(150)

5.4

(20,4)

5.8

(22,0)

7.0

(26,5)

7.1

(26,9)

7.5

(28,4)

7.9

(29,9)

7.9

(29,9)

8.3

(31,4)

8.7

(32,9)

15.0

(56,8)

15.6

(59,0)

16.4

(62,1)

14.1

(53,4)

15.6

(59,0)

17.0

(64,3)

17.0

(64,3)

18.2

(68,9)

19.2

(72,7)

33.5

(127)

33.6

(127)

33.5

(127)

33.7

(128)

35.2

(133)

37.2

(141)

37.2

(141)

39.5

(150)

42

(159)

10

Bulletin 71.4:98

Table 5. Steam Relief Capacities in Pounds per Hour (kg/h), Types 98L and 98LD with Metal Diaphragm Only

NOMINAL

BODY
SIZES,

NPS (DN)

1/4

1/2 (15)

3/4, 1

(20, 25)

SPRING

Part Number

1E392527022 Yellow

1E392627012 Green

1E392727142 Red

1L346127142 Blue

1E395627022 Yellow

1D7455T0012 Green

1E395727192 Red

1L380027142 Blue

1E398927022 Yellow

1E399027142 Green

1E399127162 Red

1L380127082 Blue

Color
Code

RELIEF

PRESSURE

SETTING,

PSIG (bar)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

2

(0,14)

5

(0,34)

10

(0,69)

15

(1,0)

20

(1,4)

25

(1,7)

25

(1,7)

30

(2,1)

35

(2,4)

FLOW AT

RELIEF

SETTING,

POUNDS/

HOUR

(kg/h)

7.5

(3,4)

7.5

(3,4)

25

(11,3)39 (17,7)50 (22,7)54(24,5)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)77 (34,9)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

25

(11,3)

2

(0,14)4(0,28)6(0,41)8(0,55)10(0,69)15(1,0)20(1,4)25(1,7)30(2,1)

18

(8,2)

18

(8,2)

36

(16,3)

39

(17,7)

41

(18,6)

36

(16,3)

39

(17,7)

41

(18,6)

59

(26,8)

73

(33,1)

59

(26,8)

64

(29,0)

68

(30,8)

50

(22,7)

52

(23,6)

55

(24,9)

122

(55,3)

127

(57,6)

136

(61,7)

100

(45,4)

127

(57,6)

136

(61,7)

91

(41,3)

118

(53,5)

127

(57,6)

PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)

30

(13,6)

33

(15,0)

50

(22,7)

52

(23,6)

54

(24,5)

54

(24,5)

59

(26,8)

61

(27,7)

86

(39,0)

95

(43,1)

105

(47,6)

95

(43,1)

100

(45,4)

109

(49,4)

77

(34,9)

82

(37,2)

86

(39,0)

177

(80,3)

182

(82,6)

200

(90,7)

173

(78,5)

210

(95,3)

236

(107)

164

(74,4)

190

(86,2)

220

(99,8)

41

(18,6)

46

(20,9)

54

(24,5)

59

(26,8)

64

(29,0)

64

(29,0)

66

(29,9)

68

(30,8)

100

(45,4)

114

(51,7)

122

(55,3)

122

(55,3)

127

(57,6)

136

(61,7)

100

(45,4)

109

(49,4)

114

(51,7)

210

(95,3)

218

(98,9)

240

(109)

228

(103)

264

(120)

280

(127)

228

(103)

254

(115)

280

(127)

48

(21,8)

54

(24,5)

59

(26,8)

64

(29,0)

68

(30,8)

73

(33,1)

73

(33,1)

77

(34,9)

82

(37,2)

114

(51,7)

127

(57,6)

136

(61,7)

141

(64,0)

145

(65,8)

164

(74,4)

123

(55,8)

136

(61,7)

145

(65,8)

236

(107)

246

(112)

280

(127)

272

(123)

310

(141)

328

(149)

272

(123)

318

(144)

346

(157)

54

(24,5)

60

(27,2)

68

(30,8)86 (39,0)

73

(33,1)

77

(34,9)

82

(37,2)

86

(39,0)

91

(41,3)

95

(43,1)

127

(57,6)

136

(61,7)

145

(65,8)

155

(70,3)

168

(76,2)

182

(82,6)

141

(64,0)

159

(72,1)

168

(76,2)

264

(120)

272

(123)

310

(141)

300

(136)

246

(112)

364

(165)

320

(145)

354

(161)

390

(177)

64

(29,0)

70.1

(31,8)

91

(41,3)

95

(43,1)

105

(47,6)

109

(49,4)

113

(51,3)

123

(55,8)

151

(68,5)

159

(72,1)

173

(78,5)

187

(84,8)

204

(92,5)

228

(103)

190

(86,2)

210

(95,3)

220

(99,8)

313

(142)

318

(144)

370

(168)

380

(172)

420

(191)

455

(206)

420

(191)

455

(206)

500

(227)

74.1

(33,6)

80.2

(36,4)

96.8

(43,9)

101

(45,8)

105

(47,6)

123

(55,8)

123

(55,8)

127

(57,6)

140

(63,5)

175

(79,4)

182

(82,6)

195

(88,5)

208

(94,3)

227

(103)

260

(118)

232

(105)

250

(113)

264

(120)

363

(165)

364

(165)

417

(189)

423

(192)

455

(206)

500

(227)

500

(227)

545

(247)

590

(268)

84.2

(33,2)

90.3

(41,0)

108

(49,0)

112

(50,8)

115

(52,2)

132

(59,9)

136

(61,7)

140

(63,5)

150

(68,0)

198

(89,8)

205

(93,0)

216

(98,0)

229

(104)

248

(112)

286

(130)

264

(120)

282

(128)

295

(134)

412

(187)

415

(188)

463

(210)

464

(210)

497

(225)

545

(247)

545

(247)

590

(268)

640

(290)

94.3

(42,8)

100

(45,4)

119

(54,0)

122

(55,3)

124

(56,2)

142

(64,4)

147

(66,7)

155

(70,3)

159

(72,1)

222

(101)

228

(103)

238

(108)

250

(113)

269

(122)

308

(140)

284

(129)

310

(141)

317

(144)

462

(210)

465

(211)

509

(231)

510

(231)

538

(244)

587

(266)

587

(266)

680

(308)

730

(331)

11