Emerson 92S Data Sheet

Bulletin 71.2:92S

Type 92S Pilot-Operated Steam Regulator

Introduction

The Type 92S steam regulator is piston actuated for
high cycle steam service which includes a Type 6492L,
6492H, or 6492HT pilot (see Figure 1). These pilots
have bellows sealed stems to eliminate stem guide
friction. The valve and pilot use lapped seating surfaces
that have been proven to minimize seat leakage.

Features

• Good Shutoff for Low Downstream Build-up—

Type 92S main valve and Types 6492H, 6492L, and
6492HT pilots are machine-lapped seating surfaces
that have been time-proven to minimize seat leakage
when the downstream demand is zero and the
regulator is shutoff.

W4086_3

MAIN VALVE WITH TYPE 6492H OR 6492HT PILOT

1 NPT STEEL

December 2011

• Resistance to Piping Stresses—Steel
constructions are available to help resist the piping
stresses commonly encountered in steam applications.

• Ease of Installation—Compact construction
reduces installation space requirements. Supply of
pressure to the pilot is supplied from the inlet side
of the main valve through factory piped tubing;
with a standard pilot, this means no separate pilot
supply pressure is required.

• Increased Sensitivity to Downstream Pressure
Changes—Friction-reducing bellows seal on

the pilot stem and large pilot diaphragm areas
yield good sensitivity.

• Ease of Pilot Maintenance—Pilot valve plug and
seat can be removed for inspection of maintenance
without disassembling piping connections and
without removing the diaphragm. Pilot inlet screen
(Figure 2) is easily removed with the seating
parts for inspection and cleaning. Diaphragm can
be removed without disturbing the seating parts.

• Noise Reduction Capability Without Decrease
in Capacity—A noise attenuation trim is

available for use with NPS 2 / DN 50 and larger
main valve sizes to provide an economical yet

W4088_1

NPS 3 / DN 80 FLANGED CAST IRON

MAIN VALVE WITH TYPE 6492L PILOT

Figure 1. Type 92S Pilot-Operated Steam Regulator

full- ow means for the reduction of noise from high
velocity steam  ow. Further noise reduction of

the system can be achieved by the use of a heavier
piping schedule and/or thermal insulation of the
attached piping.

www. sherregulators.com

D100621X012

Bulletin 71.2:92S

Specications

Main Valve Body Sizes and End Connection Styles

END CONNECTION STYLES AND RATINGS

BODY SIZES

1, 1-1/2, and 2 NPT NPT or PN 16/25/40

NPS 1, 1-1/2, 2, 2-1/2, 3,

and 4 / DN 25, 40, 50, 65,

80, and 100

NPS 6 x 4 /

DN 150 x 100

(2)

Cast Iron Body

CL125 FF or

CL250 RF

Not available

Maximum Inlet and Pilot Supply Pressure

Steel or

Stainless Steel Body

CL150 RF, CL300 RF,

CL600 RF, or

PN 16/25/40

CL300 RF,

CL600 RF, or

PN 16/25-40/64/100

(1)

Cast Iron Main Valve and Pilot: 250 psig /

17.2 bar or body rating limit, whichever is lower
Steel Main Valve and Pilot: 300 psig / 20.7 bar
or body rating limit, whichever is lower

MAXIMUM

(1)

Minimum and Maximum Differential Pressures

BODY SIZES,

NPS / DN

1, 1-1/2, and 2 /

25, 40, and 50

2-1/2, 3, 4, and 6 x 4 /

65, 80,100, and

150 x 100

(2)

MINIMUM

DIFFERENTIAL

PRESSURE

15 psi / 1.0 bar

20 psi / 1.4 bar

DIFFERENTIAL

PRESSURE

200 psi / 13.8 bar or

body rating limit,

whichever is lower

175 psi / 12.1 bar or

body rating limit,

whichever is lower

Outlet (Control) Pressure Ranges

See Table 1

Maximum Outlet Pressures

See Table 2

(1)

Maximum Allowable Loading Pressure for Pilot
with Tapped Spring Case

Combination of pilot control spring setting and spring
case loading pressure cannot exceed 150 psig /

10.3 bar for Type 6492H pilot or 25 psig / 1.7 bar
for Type 6492L pilot and 250 psig / 17.2 bar for
Type 6492HT

Droop

See Table 5 and Figure 8

Typical Regulating Capacities

See Table 5 and Capacity Information section

Main Valve Orice Sizes and Flow Coefcients

See Table 3

Noise Information
See Table 6 and Noise Abatement Information section

Construction Materials
Main Valve

Body and Body Flange: Cast iron (NPS 1 through 4 /
DN 25 through 100 sizes only), steel or CF8M
Stainless steel (all sizes)

Valve Plug: Heat-treated 17-4PH stainless steel
Cage: Cast iron or Stainless steel
Spiral Wound Gasket: 316L stainless steel

and graphite

Spring, Lower Stem, Retaining Ring, Bolting, and
Cylinder Spacer: Steel or plated steel
Body and Cylinder Gaskets: Copper
Pistons, Seat Ring, and Cylinders: Heat-treated

416 Stainless steel

Piston Ring(s): Polytetrauoroethylene (PTFE)
Piston Ring Retainer(s): 302 Stainless steel
Noise Attenuation Trim (If Used):

Stainless steel

Stem Seal: PTFE/glass

Pilot

Body and Spring Case: Cast iron, Steel, and
Stainless steel
Seat Ring and Stem: Heat-treated
416 Stainless steel

Bellows and Bellows Retainer: Brass
Plug, Plug Guide, Plug Spring, Diaphragms, Bleed
Restriction, and Inlet Screen: Stainless steel
Diaphragm Gasket: Encapsulated ber asbestos
Control Spring, Upper Spring Seat, Adjusting
Screw, Bolting, Pipe Plug, Reducing Bushing,
and (If Used) Diaphragm Plate: Steel
Fittings: Brass
Tubing: Copper

Pipe Nipple: Steel

1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitations, must not be exceeded.

2. The two-number designation indicates line size by trim size.

- continued -

2

Specications (continued)

Bulletin 71.2:92S

Maximum Temperature Capabilities

(1)

Cast Iron Main Valve and Pilot: 406°F / 208°C
Steel Main Valve and Pilot: 500°F / 260°C
High Temperature Optional Steel and Stainless

Pressure Registration

External through downstream control line

Approximate Weights

steel Main Valve and Pilot: 650°F / 343°C

Downstream Control Line Connection
NPS 1, 1-1/2, and 2 / DN 25, 40, and 50
Main Valve Sizes: 1/4 NPT in main valve

cylinder spacer

NPS 2-1/2, 3, 4, and 6 x 4 / DN 65, 80, 100, and
150 x 100

(2)

Main Valve Sizes: 1/4 NPT

in pilot body

Pilot Spring Case Vent
Standard: 1/8-inch / 3.18 mm drilled hole

BODY SIZE

NPS DN Pounds kg

1

1-1/2

2 50

2-1/2

3

6 x 4

4

(2)

100

150 x 100

CONNECTION STYLE

25
40

65
80

(2)

Flanged

Optional: 1/4 NPT tapping for pressure loading or
on-off service

1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitations, must not be exceeded.

2. The two-number designation indicates line size by trim size.

Table 1. Outlet (Control) Pressure Ranges

PILOT TYPE

6492L

6492H

6492HT

OUTLET PRESSURE

RANGES

psig bar Inches mm Inches mm

2 to 6

5 to 15

13 to 25

10 to 30
25 to 75

70 to 150

15 to 100
80 to 250

0.14 to 0.41

0.35 to 1.0

0.90 to 1.7

0.69 to 2.1

1.7 to 5.2

4.8 to 10.3

1.0 to 6.9

5.5 to 17.2

PART NUMBER COLOR CODE

1E395627022

1D7455T0012

1E395727192

1E395627022

1D7455T0012

1E395727192

14B9943X012
14B9942X012

Yellow
Green

Red

Yellow
Green

Red

Unpainted

SPRING WIRE DIAMETER SPRING FREE LENGTH

0.207

0.234

0.283

0.207

0.234

0.283

0.282

0.375

END

NPT or anged
NPT or anged

NPT

Flanged

Flanged
Flanged
Flanged

CL300 335 152

CL600 435 197

5.26

5.94

7.19

5.26

5.94

7.19

7.16

9.53

APPROXIMATE

WEIGHTS

32
44

55
67

90

115

165

2.50

2.62

2.44

2.50

2.62

2.44

2.50

2.50

15
20

25
30

41
52
75

63.5

66.6

62.0

63.5

66.6

62.0

63.5

63.5

Table 2. Maximum Inlet and Outlet Pressures

MAXIMUM ALLOWABLE INLET PRESSURE

CONSTRUCTION

With Type 6492HT pilot - - - -

With Type 6492H pilot

With Type 6492L pilot 25 1.7 100 psig / 6.9 bar 100 psig / 6.9 bar

Cast Iron

psig bar psig bar psig bar

250 17.2

Steel and

Stainless Steel

300 20.7

MAXIMUM

OPERATING OUTLET

PRESSURE

250 17.2 - - - -

150 10.3

MAXIMUM EMERGENCY OUTLET PRESSURE

Cast Iron Main Valve

and Pilot Body

250 psig / 17.2 bar or

main valve body rating

limit, whichever is lower

Steel or Stainless

Steel Main Valve and

Pilot Body

300 psig / 20.7 bar or

main valve body rating

limit, whichever is lower

300 psig / 20.7 bar or

main valve body rating

limit, whichever is lower

3

Bulletin 71.2:92S

Table 3.  Flow and Sizing Coefcients

BODY SIZE ORIFICE SIZE

NPS DN Inches mm X

1 25 7/8 22 16 17.5

2 50 1-29/64 37 48 52 0.48

2-1/2 65 1-5/8 41 74 78

3 80 2-1/16 52 100 110 0.47

4 100 2-3/8 60 140 145 0.46

6 x 4 150 x 100 2-3/8 60 150 155 0.46

1. C

= Cs x 20 ÷ C

v

1

• Lapped Seats for Tight Shutoff—The valve and
pilot use lapped seating surfaces that have been
proven to minimize seat leakage.

• Application Flexibility—Pilot with optional
tapped spring case is available for use either
with an air loading regulator for remote adjustment
of outlet pressure setting or, when all compression
is removed from the pilot control spring, with a
solenoid or switching valve for on-off service.

(1)

REGULATING

C

s

WIDE-OPEN Cs FOR

RELIEF SIZING

the main valve spring to close the main valve plug,

reducing ow to the downstream system in response

to the decreased demand.

With a pilot for pressure-loaded service (Figure 7), the
operation is the same as for a standard pilot except
that the pilot control spring force on the pilot valve
plug is aided by pneumatic pressure from the loading
device. With a pilot for on-off service, the only force
acting on top of the pilot diaphragm is pneumatic

C

1

34

K

0.62

0.71

m

IEC SIZE COEFFICIENTS

T

0.73

pressure provided by the solenoid or switching valve.

F

0.51

0.48

D

F

0.791-1/2 40 1-1/8 29 30 33 0.47

0.84

L

Principle of Operation

Pilot supply pressure is piped from the main valve inlet
(Figure 2) to the pilot inlet connection. Downstream
pressure registers on the main valve pistons through the
downstream control line and then on the pilot diaphragm.

When increased downstream demand lowers the
downstream pressure to a value below the setting
of the pilot control spring, this forces the pilot valve
plug to open increasing the loading pressure on the
main valve pistons. At the same time, the increased
demand lowers the downstream pressure on the
main valve piston(s). This opens the main valve plug,

increasing ow to the downstream system to satisfy

the increased demand and to restore downstream
pressure to the setting of the pilot control spring.

Decreased downstream demand increases the
downstream pressure registered on the pilot
diaphragm. The increased pressure overcomes the
force of the pilot control spring and allows the pilot
valve plug spring to close the valve plug. As the pilot
valve plug closes, excess loading pressure bleeds
to the downstream system through the pilot bleed
restriction. At the same time, decreased downstream
demand increases the downstream pressure
registered on the main valve piston(s). This allows

Installation

The Type 92S regulator should be installed and
used in accordance with governmental codes and
regulations. Although this regulator minimizes
leakage under shutoff conditions, downstream
overpressure protection must be provided by the
user. The pressure and temperature limitations in

the Specications section must be observed and the

downstream equipment protected.

A Type 92S regulator may be installed in any
orientation, but should not be installed in a tall vertical
pipeline where condensate could collect and create
a pressure head affecting regulator performance.

To obtain maximum ow capacities in some instances,

outlet piping will have to be swaged up above the
given body size.

A downstream control line is required but is not
furnished with the Type 92S regulator. Additionally,
an adjustable loading pressure regulator and loading
pressure piping are required for pressure-loading pilot
regulators, while an on-off or solenoid valve is required
for on-off pilot regulators.

Dimensions are shown in Figure 9.

4

Type 92S

Type 92S

PILOT
SPRING

Bulletin 71.2:92S

PILOT INLET
SCREEN

A6552

PILOT VALVE
PLUG

MAIN VALVE
PISTONS

MAIN VALVE
PLUG

MAIN VALVE BODY AND TYPE 6492H OR 6492HT PILOT

NPS 1, 1-1/2, OR 2 / DN 25, 40, OR 50

MAIN VALVE
SPRING

MAIN VALVE
PISTON

MAIN VALVE
STEM

A6553

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

NPS 2-1/2, 3, 4, OR 6 x 4 / DN 65, 80, 100, OR 150 x 100

MAIN VALVE BODY AND TYPE 6492L PILOT

Figure 2. Type 92S Pressure Reducing Regulator Operational Schematics

MAIN VALVE
PLUG

PILOT VALVE
PLUG SPRING

PILOT INLET
SCREEN

5

Bulletin 71.2:92S

T

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

E0402

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

TYPE 6492HM SAFETY
OVERRIDE PILOT

Figure 3. NPS 1, 1-1/2, and 2 / DN 25, 40, and 50 Type 92S Pilot-Operated Pressure Reducing Regulator with Safety Override
Pilot Operational Schematic

TYPE 92S MAIN VALVE

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

TYPE 6492H PILOT

E0403

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE

INTERMEDIATE PRESSURE

TYPE 6492HM SAFETY
OVERRIDE PILOT

Figure 4. NPS 2-1/2, 3, and 4 / DN 65, 80, and 100 Type 92S Pilot-Operated Pressure Reducing Valve with Safety Override
Pilot Operational Schematic

6

Table 4. Safety Pilot Outlet (Control) Pressure Ranges

Bulletin 71.2:92S

TYPE

6492HM

6492HTM

SPRING RANGE

psig bar

10 to 30 0.69 to 2.1 Yellow 1E395627022 5 psig / 0.35 bar over normal distribution pressure

25 to 75 1.7 to 5.2 Green 1D7455T0012

70 to 150 4.8 to 10.3 Black 1E395727192

15 to 100 1.0 to 6.9

80 to 250 5.5 to 17.2 14B9942X012

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

SPRING COLOR PART NUMBER

Unpainted

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

14B9943X012

TOP VIEW

MINIMUM PRESSURE AT WHICH

MONITORING PILOT CAN BE SET

10 psig / 0.69 bar over normal distribution pressure

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

TYPE 6492HM SAFETY
OVERRIDE PILOT

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

SIDE VIEW

Figure 5. NPS 1, 1-1/2, and 2 / DN 25, 40, and 50 Piping Schematics

7

Bulletin 71.2:92S

Type 92S Pilot-Operated Pressure
Reducing Regulator with Safety
Override Pilot

A Type 6492HM or 6492HTM safety override pilot is
available for the Type 92S. The Type 6492H pilot is
used in a series installation with the Type 6492HM
or 6492HTM safety override pilot installed on the
upstream regulator. The Type 6492HM or 6492HTM
safety override pilot senses pressure downstream
of the second valve, and prevents pressure from
rising above safe operating pressure in the event the
downstream valve fails. This system is approved by

ASME B31.1-1989, 122.14.2.A, and can replace an
ASME safety valve when vent piping is not practical

and Type 92S Pilot-Operated, Pressure Reducing
Regulator with Safety Override Pilot upstream steam
pressure does not exceed 400 psig / 27.6 bar. Local
codes and standards may require approval by an
appropriate authority prior to installation.

Operation

Once placed in operation, the upstream Type 6492H
pilot senses the intermediate pressure between both
valves, and the Type 6492HM or 6492HTM pilot
senses downstream pressure of the second valve. As

demand for ow increases, intermediate pressure will

fall causing the Type 6492H pilot to open. As the
Type 6492H pilot valve opens, loading pressure to the
main valve increases, opening the main valve.

The Type 6492HM or 6492HTM safety override
pilot remains open because its setpoint is above the
setpoint of the downstream valve. In the unlikely event
that the downstream valve fails open, downstream
pressure will rise above the downstream valve’s
setpoint. This pressure is sensed by the
Type 6492HM or 6492HTM safety override pilot. As
downstream pressure increases the safety override
pilot closes, reducing loading pressure to the main
valve, which positions the main valve to maintain

downstream pressure as specied per ASME Boiler

and Pressure Vessel Code, Section VIII.

In the event that the upstream valve fails, the
downstream regulator will prevent downstream
pressure from rising above safe operating levels.
It is recommended to install some type of warning
system, such as a sentinal relief valve, to warn the
operator that a valve has failed in the system. This
will prevent prolonged operation with one valve, which
could cause valve trim wear and noise associated with
operation at high differential pressures.

When operating in most steam systems, valve setpoints

should be in strict accordance to ASME Boiler and

Pressure Vessel Code, Section VIII. The Type 6492HM
or 6492HTM safety override pilot should be set at
10 psig / 0.69 bar or 10% above maximum downstream
operating pressure of the second valve, whichever
pressure is greater. For example, most HVAC systems
operate at 15 psig / 1.0 bar, so the safety override pilot
should be set no higher than 25 psig / 1.7 bar.

Capacity Information

Table 5 gives typical regulating capacities in pounds
per hour / kg/h of saturated steam. Capacities for
regulators with noise attenuation trim are the same as
for regulators without noise attenuation trim. Figure 8
shows a typical performance curve.

To determine regulating capacities at pressure settings
not given in Table 5 or to determine wide-open
capacities for relief sizing at any inlet pressure, use the
following procedure 1 or 2 as appropriate.

1. If the steam is saturated and the pressure drop
across the regulator is critical (absolute outlet
pressure is equal to approximately one-half or less
than one-half of the absolute inlet pressure), use
the equation:

Q = (P

where,

Q = Flow capacity in pounds of saturated steam
per hour

P

= Absolute inlet pressure in psia (P

1abs

Cs = Regulating or wide-open steam sizing coefcient
(see Table 3)

2. If the steam is superheated or if the pressure drop
across the regulator is lower than critical (absolute
outlet pressure is greater than approximately one­ half the absolute inlet pressure), use the valve
sizing slide rule or the sizing nomographs
in Catalog 10.

1abs

) (Cs)

1gauge

+ 14.7)

Noise Abatement Information

A noise attenuation trim is available for use with
NPS 2 / DN 50 and larger Type 92S steam regulators
to provide an economical means for the reduction of

noise from high-velocity steam ow. Capacities for a

regulator equipped with a noise attenuation trim are
the same as for a regulator without noise attenuation
trim and are given in Table 5.

8

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

TYPE 6492HM SAFETY
OVERRIDE PILOT

Bulletin 71.2:92S

BOTTOM VIEW

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

SIDE VIEW

Figure 6. NPS 2-1/2, 3, and 4 / DN 65, 80, and 100 Piping Schematics

Noise level values for a regulator equipped either
with or without a noise attenuation trim are presented
in Table 6. These noise levels are determined at
a point 39-inches / 991 mm downstream of the
regulator outlet and 39-inches / 991 mm from the
piping surface.

For example, consider full-capacity ow of steam

through a NPS 2 / DN 50 Type 92S steam regulator
connected with uninsulated 2-inch / 51 mm Schedule
40 downstream piping (see Table 6). For an inlet
pressure of 250 psig / 17.2 bar and an outlet pressure
of 100 psig / 6.9 bar, P/P

is 0.6. Under the

1abs

specied service conditions, the noise level for steam

ow through a Type 92S steam regulator without a

noise attenuation trim will be 98 decibels, while the
same regulator equipped with a noise attenuation trim
will have a noise level reduced to 92 decibels.

Noise levels for steam ow through a Type 92S steam

regulator can be reduced further with the use of either
a heavier schedule of pipe or thermal insulation of
the downstream piping. By using thermal insulation,
as much as 15 decibels of noise can be additionally
reduced from the system. Consult the insulation

manufacturer’s specications for the attenuating
capability and application procedures of the specic

insulation required by your system.

9

Bulletin 71.2:92S

AIR LOADING
REGULATOR

STRAINER

BLOCK VALVES

16A7958-B
16A1547-A
A3334

Figure 7. Typical Pressure-Loaded Pilot Installation

1000 2000 3000 4000 5000 6000 7000

80

NEEDLE
VALV E

CONTROL LINE
CONNECTION

VENT VALVE

FLOW kg/h OF SATURATED STEAM

BLEED RESTRICTION (REQUIRED
ONLY IF THE LOADING REGULATOR
DOES NOT HAVE INTERNAL RELIEF)

BYPASS LINE

CONTROL LINE
SHUTOFF VALVE

BLOCK
VALV E

5

A3330/IL

60

40

OUTLET PRESSURE, psig

20

0

0 4000 8000 12,000 16,000

FLOW, POUNDS/HOUR OF SATURATED STEAM

NOTE:
INITIAL OUTLET PRESSURE SETTING IS 60 psig / 4.1 bar

4

3

2

OUTLET PRESSURE, bar

1

0

Figure 8. Typical Performance Curve for NPS 2-1/2 / DN 65 Type 92S Pressure Reducing Regulator with Type 6492H Pilot

10

Bulletin 71.2:92S

Table 5. Flow Capacities in Pounds per Hour / kg/h of Saturated Steam

OUTLET

PRESSURE

SETTING

psig bar psig bar lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h

5 0.35 6492L

10 0.69

15 1.0

20 1.4

30 2.1

40 2.8

50 3.5

60 4.1

80 5.5

100 6.9

1. Standard pilot or combination of setting plus loading pressure or optional pilot.

- shaded areas show where maximum differential pressure is exceeded.

(1)

NUMBER

6492H or

6492H, or

6492HT

6492H, or

6492HT

6492HT

6492HT

6492HT

6492HT

6492HT

6492HT

PILOT

TYPE

6492L

6492L,

6492L,

6492H,

6492H,

6492H,

6492H,

6492H,

6492H,

INLET

PRESSURE

25

1.7

30

2.1

50

3.5

75

5.2

100

6.9

150

10.3

30

2.1

50

3.5

75

5.2

100

6.9

150

10.3

200

13.8

35

2.4

50

3.5

75

5.2

100

6.9

150

10.3

200

13.8

50

3.5

75

5.2

100

6.9

150

10.3

200

13.8

50

3.5

75

5.2

100

6.9

150

10.3

200

13.8

60

4.1

75

5.2

100

6.9

150

10.3

200

13.8

75

5.2

100

6.9

150

10.3

200

13.8

250

17.2

80

5.5

100

6.9

150

10.3

200

13.8

250

17.2

100

6.9

150

10.3

200

13.8

250

17.2

125

8.6

150

10.3

200

13.8

250

17.2

300

20.7

575
700
950

1,350
1,725
1,800

700
1,040
1,440

1,800
2,350
2,150

710
1,040
1,440

1,820
2,600
3,400

1,040
1,440
1,820
2,650
3,450

900
1,440
1,820
2,650
3,450

1,100
1,440
1,820
2,650
3,450

1,250
1,820
2,650
3,450
4,300

1,365
1,780
2,650
3,450
4,300

1,450
2,600
3,450
4,300

1,900
2,490
3,450
4,300
5,050

261
318
431

612
782
816

318
472
653

816

1066

975

322
472
653

826
1179
1542

472

653

826
1202
1565

408

653

826
1202
1565

499

653

826
1202
1565

567

826
1202
1565
1950

619

807
1202
1565
1950

658
1179
1565
1950

862
1129
1565
1950
2291

950
1,150
1,800

2,375
3,050
4,050

1,200
1,800
2,600

3,300
4,500
5,100

1,300
1,800
2,650

3,400
4,800
6,200

1,800
2,700
3,450
4,900
6,400

1,650
2,700
3,450
4,900
6,500

1,750
2,500
3,450
4,900
6,500

2,250
3,200
4,900
6,500
8,000

2,300
3,100
4,900
6,500
8,000

2,600
4,650
6,500
8,000

3,300
4,350
6,250
8,000
9,400

431
522
816

1,077
1,383
1,837

544
816

1,179

1,497
2,041
2,313

590
816

1,202

1,542
2,177
2,812

816
1,225
1,565
2,223
2,903

748
1,225
1,565
2,223
2,948

794
1,134
1,565
2,223
2,948

1,021
1,452
2,223
2,948
3,629

1,043
1,406
2,223
2,948
3,629

1,179
2,109
2,948
3,629

1,497
1,973
2,835
3,629
4,264

MAIN VALVE BODY SIZE, NPS / DN

1,750

794

1,000
1,880
2,950

4,100
5,600
6,150

2,050
3,100
4,400

5,600
8,000
9,200

2,100
2,950
4,300

5,450
7,800

10,200

2,950
4,300
5,450
7,950

10,300

2,700
4,300
5,450
7,950

10,000

3,300
4,300
5,450
7,950

10,300

3,750
5,450
7,950

10,300
12,900

4,080
5,300
7,950

10,300
12,900

4,350
7,800

10,300
12,900

5,700
7,450

10,300
12,900
15,100

853

1,338

1,860
2,540
2,790

930
1,406
1,996

2,540
3,629
4,173

953
1,338
1,950

2,472
3,538
4,627

1,338
1,950
2,472
3,606
4,672

1,225
1,950
2,472
3,606
4,536

1,497
1,950
2,472
3,606
4,672

1,701
2,472
3,606
4,672
5,851

1,851
2,404
3,606
4,672
5,851

1,973
3,538
4,672
5,851

2,586
3,379
4,672
5,851
6,849

1,500
4,180

6,000
8,500

11,900

3,050
4,700
6,000

8,600

12,000

2,300
4,550
6,300

8,100

12,100

4,590
6,450
8,650

12,300

4,040
6,580

8,400
12,000
15,700

4,500

6,300

8,500
12,600
16,700

4,950

8,400
12,200
15,695

5,500

7,880
12,300
16,400

6,270
11,700
15,600
19,300

8,470
11,000
15,700
20,100

454
680

1,896

2,722
3,856
5,398

1,383
2,132
2,722

3,901
5,443

1,043
2,064
2,858

3,674
5,489

2,082
2,926
3,924
5,579

1,833
2,985
3,810
5,443
7,122

2,041
2,858
3,856
5,715
7,575

2,245
3,810
5,534
7,119

2,495
3,574
5,579
7,439

2,844
5,307
7,076
8,754

3,842
4,990
7,122
9,117

1,225
2,200
6,550

8,400
10,300
16,900

4,300

6,250

9,000

10,700
17,000

3,200

6,200

8,900

11,800
16,900

6,250

9,100
11,900
17,150

5,350

8,800
11,800
17,000
22,100

6,400

8,350
11,400
17,000
22,650

7,950
11,800
17,000
22,100

7,700
10,600
16,750
22,450

9,250
15,850
21,750
27,750

11,400
14,900
21,350
26,800

556
998

2,971

3,810
4,672
7,666

1,950
2,835
4,082

4,854

7,711

1,452
2,812
4,037

5,352
7,666

2,835
4,128
5,398
7,779

2,427
3,992
5,352

7,711

10,025

2,903
3,788
5,171

7,711

10,274

3,606
5,352

7,711

10,025

3,493
4,808
7,598

10,183

4,196
7,190
9,866

12,587

5,171
6,759
9,684

12,156

2510
4000
8500

12,600
14,300
23,000

5800
8920

11,000

16,300
19,600

4600
7700

11,900

16,100
23,100

7,570
11,000
16,200
23,500

7770
12,000
19,000
23,100
30,100

8800
11,300
15,300
23,000
30,600

10,800
16,100
23,100
30,100

10,500
14,200
22,700
30,200

11,900
21,400
29,600
38,000

14,400
19,900
28,700
35,700

1,139
1,814
3,856

5,715
6,486

10,433

2,631
4,046
4,990

7,394
8,891

2,087
3,493
5,398

7,303

10,478

3,434
4,990
7,348

10,660

3,524
5,443

8,618
10,478
13,653

3,992

5,126

6,940
10,433
13,880

4,899

7,303
10,478
13,653

4763

6,441
10,297
13,699

5,398

9,707
13,427
17,237

6,532

9,027
13,018
16,194

2,600
4,100
8,600

12,900
15,100
23,600

5,800
9,200

11,500

17,100
20,200

4,600
8,100

12,200

16,800
23,800

7,700
11,800
16,900
24,100

8,100
12,500
19,600
23,800
30,600

9,000
11,900
16,100
24,000
31,400

11,500
17,000
24,000
31,000

11,000
15,000
23,000
31,000

12,300
22,000
30,200
39,000

15,200
20,500
29,100
36,500

1,179
1,860
3,901

5,851
6,849

10,705

2,631
4,173
5,216

7,757
9,163

2,087
3,674
5,534

7,620

10,796

3,493
5,352
7,666

10,932

3,674
5,670

8,891
10,796
13,880

4,082

5,398

7,303
10,886
14,243

5,216

7,711
10,886
14,062

4,990

6,804
10,433
14,062

5,579

9,979
13,699
17,690

6,895

9,299
13,200
16,556

DROOP1 / 25 1-1/2 / 40 2 / 50 2-1/2 / 65 3 / 80 4 / 100 6 x 4 / 150 x 100

1 psi /

0.07 bar

10% of

outlet

pressure

setting

- continued -

11

Bulletin 71.2:92S

Table 5. Flow Capacities in Pounds per Hour / kg/h of Saturated Steam (continued)

OUTLET

PRESSURE

SETTING

psig bar psig bar lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h lbs/h kg/h

125 8.6

150 10.3

1. Standard pilot or combination of setting plus loading pressure or optional pilot.

- shaded areas indicate where minimum differential pressure is not attained.

(1)

PILOT

TYPE

NUMBER

6492H,

6492HT

6492H,

6492HT

INLET

PRESSURE

140

9.7

150

10.3

200

13.8

250

17.2

300

20.7

175

12.1

200

13.8

250

17.2

300

20.7

1,600
1,900
3,150
4,300
5,050

2,450
3,050
4,150
5,050

726

862
1,429
1,950
2,291

1,111
1,383
1,882
2,291

3,100

3650
5,750
8,000
9,400

4,000
5,250
7,400
9,400

1,406
1,656
2,608
3,629
4,264

1,814
2,381
3,357
4,264

Table 6. Noise Level Data in Decibels with Schedule 40 Downstream Piping and No Insulation

NPS 2 / DN 50 Main

Valve Body with

2-inch / 51 mm

Downstream Piping

Without

Attenuator

73
62

79
68

82
71

84
73

87
76

88
78

78
67

84
73

86
76

89
78

92
81

82
93

Attenuator

With

P

1

P

psig bar

50 3.5

100 6.9

1. Overall noise levels determined at a point 39-inches / 991 mm downstream of the regulator outlet and 39-inches / 991 mm from piping surface.

∆P

1abs

0.2

0.3

0.4

0.5

0.6

0.7

0.2

0.3

0.4

0.5

0.6

0.7

PERCENTAGE

OF MAXIMUM

REGULATOR

FLOW RATE

100

30

100

30

100

30

100

30

100

30

100

30

100

30

100

30

100

30

100

30

100

30

100

30

MAIN VALVE BODY SIZE, NPS / DN

4,800

2,177

5,700

2,586

9,200

9,450
12,900
15,100

7,300

9,100
12,400
15,100

72
61

77
66

79
68

80
69

80
70

82
71

77
66

82
71

84
72

85
74

86
75

75
86

4,287
5,851
6,849

3,311
4,128
5,625
6,849

NPS 2-1/2 / DN 65 Main

Valve Body with

4-inch / 102 mm

Downstream Piping

Without

Attenuator

66
59

72
61

76
65

78
67

81
70

84
73

71
64

77
66

81
70

83
72

86
75

78
89

14,600
19,500
23,800

10,000
13,400
18,600
23,400

10,796

10,614

Attenuator

4173
6623
8845

4536
6078
8437

NOISE LEVEL, dBA

With

64
56

68
57

69
61

72
63

75
65

79
69

69
61

73
62

74
66

77
68

80
70

74
84

13,100

5,942

19,950

9,049

27,000

12,247

32,500

14,742

14,000

6,350

18,200

8,256

25,750

11,680

31,900

14,470

NPS 3 / DN 80 Main

Valve Body with

4-inch / 102 mm

Downstream Piping

Without

Attenuator

72
63

78
65

80
69

82
73

82
74

88
80

77
68

83
70

85
74

87
78

87
79

85
93

(1)

16,400
27,000
37,500
44,300

19,100
30,800
34,100
42,900

Attenuator

With

68
60

72
61

74
65

76
67

79
68

83
71

73
65

77
66

79
70

81
72

84
73

76
88

7,439

16,900

12,247

28,000

17,010

38,300

20,094

45,100

8,664

20,100

13,971

31,000

15,468

35,200

19,459

43,300

NPS 4 / DN 100 Main

Downstream Piping

Without

Attenuator

12,701
17,373
20,457

14,062
15,967
19,641

Valve Body with
8-inch / 203 mm

78
71

83
73

86
76

88
79

90
80

92
83

83
76

88
78

91
80

93
84

95
85

88
97

7,666

9,117

Attenuator

DROOP1 / 25 1-1/2 / 40 2 / 50 2-1/2 / 65 3 / 80 4 / 100 6 x 4 / 150 x 100

10% of

outlet

pressure

setting

With

76
68

78
70

81
73

83
75

84
76

87
79

81
73

83
75

86
78

88
80

89
81

84
92

12

- continued -

Bulletin 71.2:92S

Table 6. Noise Level Data in Decibels with Schedule 40 Downstream Piping and No Insulation

NOISE LEVEL, dBA

NPS 2 / DN 50 Main

Valve Body with

2-inch / 51 mm

Downstream Piping

Without

Attenuator

84
73

90
80

93
82

95
85

98
88

101

89

Attenuator

With

81
71

85
77

88
78

91
80

92
82

94
83

P

1

P

psig bar

250 17.2

1. Overall noise levels determined at a point 39-inches / 991 mm downstream of the regulator outlet and 39-inches / 991 mm from piping surface.

∆P

1abs

0.2

0.3

0.4

0.5

0.6

0.7

PERCENTAGE

OF MAXIMUM

REGULATOR

FLOW RATE

100

30

100

30

100

30

100

30

100

30

100

30

Ordering Information

When ordering, specify:

NPS 2-1/2 / DN 65 Main

Valve Body with
4-inch / 102 mm

Downstream Piping

Without

Attenuator

78
71

84
73

88
77

90
79

93
82

96
85

With

Attenuator

76
68

80
69

81
73

84
75

87
77

91
81

Construction

Refer to the Specications section on page 2. Review

(1)

(continued)

NPS 3 / DN 80 Main

Valve Body with

4-inch / 102 mm

Downstream Piping

Without

Attenuator

84
75

90
77

92
81

94
85

94
86

100

92

Attenuator

the descriptions to the right of each specication,

Application

• Range of temperatures

• Range of inlet pressures (maximum, normal, minimum)

• Outlet pressure setting

• Range of ow rates (maximum, normal,

minimum, controlled)

• Body size

and specify the desired choice wherever there is a

selection to be made. If not otherwise specied,

the pilot control spring is factory-set at the
approximate mid-range.

Be sure to specify the type of regulator desired
(standard pilot or pilot with optional tapped spring case).
Refer to separate bulletins for information on loading
regulators for use with pressure loaded pilots.

With

80
72

84
73

86
77

88
79

91
80

95
83

NPS 4 / DN 100 Main

Valve Body with
8-inch / 203 mm

Downstream Piping

Without

Attenuator

90
83

95
85

98
88

100

91

102

92

104

95

With

Attenuator

88
80

90
82

93
85

95
87

96
88

99
91

13

Bulletin 71.2:92S

TRIM
REMOVAL
CLEARANCE

17A8559-A
B1904

E

1/4 NPT
CONTROL LINE
CONNECTION

B

1/4 NPT
CONTROL LINE
CONNECTION ON
BACKSIDE

A/2

A

NPS 1, 1-1/2, OR 2 / DN 25, 40, OR 50 MAIN VALVE BODY

S

R

R

S

E

17A8560-A
B1904

A/2

A

TRIM
REMOVAL
CLEARANCE

B

NPS 2-1/2, 3, 4, OR 6 x 4 / DN 65, 80, 100, OR 150 x 100 MAIN VALVE BODY

Figure 9. Dimensions

Table 7. Dimensions

DIMENSIONS, INCHES / mm

184
222
254

276
298
353

- - - -

A

CL250 RF or

CL300 RF

Flanged

7.75

9.25

10.50

11.50

12.50

14.50

18.62

197
235
267

292
318
368
473

CL600 RF

Flanged

8.25

9.88

11.25

12.25

13.25

15.50

20.00

210
251
286

311
337
394
508

3.88

5.38

5.88

6.56

7.38

8.62

8.62

B

99
137
149

167
187
219
219

E

(Maximum)

11.69

12.19

13.00

17.19

18.25

20.44

22.06

297
310
330

437
464
519
560

Types 6492H

and 6492HT

8.50

8.81

9.06

8.75

8.75

10.38

11.50

MAIN VALVE

BODY SIZE

NPS DN Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm

1

25

1/2

40

2

50

2-1/2

6 x 4

3
4

65
80

100

150 x 100

8.25

9.88

11.25

NPT

- - - -

- - - -

- - - -

- - - -

210
251
286

CL125 FF or

CL150 RF

Flanged

7.25

8.75

10.00

10.88

11.75

13.88

- - - -

Pilot

216
224
230

222
222
264
292

R

Type 6492L

9.88

10.19

10.44

10.12

10.12

11.75

12.88

PIlot

251
259
265

257
257
298
327

1.94

2.69

2.94

3.28

3.69

4.31

4.31

S

Trim

Removal

Clearance

49

68752.75 70

83

3.12

94

3.12

109

5.00

109

7.00

127
178

79
79

14

Ordering Guide

Bulletin 71.2:92S

Body Size (Select One)

NPS 1 / DN 25**
NPS 1-1/2 / DN 40**
NPS 2 / DN 50***
NPS 2-1/2 / DN 65*
NPS 3 / DN 80**
NPS 4 / DN 100**
NPS 6 x 4 / DN 150 x 100
(WCC, Steel, or Stainless steel with CL300 RF and
CL600 RF only)*

Body and Body Flange Material and
End Connection Style (Select One)

Cast Iron

NPT***
CL125 FF**
CL250 RF**

WCC Steel

NPT***
CL150 RF**
CL300 RF**
CL600 RF**
PN 16/25/40**

CF8M Stainless Steel

NPT**
CL150 RF*
CL300 RF*
CL600 RF*
PN 16/25/40*

Tubing and Fittings (Select One)

Copper tubing with brass ttings***
Stainless steel tubing and ttings**

Outlet Pressure Range (Select One)

Type 6492L Pilot

2 to 6 psig / 0.14 to 0.41 bar, Yellow***
5 to 15 psig / 0.35 to 1.0 bar, Green***
13 to 25 psig / 0.90 to 1.7 bar, Red***

Type 6492H Pilot

10 to 30 psig / 0.69 to 2,1 bar, Yellow***
25 to 75 psig / 1.7 to 5.2 bar, Green***
70 to 150 psig / 4.8 to 10.3 bar, Red***

Type 6492HT Pilot

15 to 100 psig / 1.0 to 6.9 bar, Unpainted***
80 to 250 psig / 5.5 to 17.2 bar, Unpainted***

Noise Attenuation Trim (Optional)

Yes**

Replacement Pilot (Optional)

Yes, send one replacement pilot to match this order.

Main Valve Replacement Parts Kit (Optional)

Yes, send one main valve replacement parts kit to match

this order.

Pilot Replacement Parts Kit (Optional)

Yes, send one pilot replacement parts kit to match
this order.

Pilot Bellows (Select One)

Brass (standard)***
321 Stainless steel**

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.

Steam Specication Worksheet

Application:

Tag Number:
Valve Type: Direct-Operated Pilot-Operated

Pressure Loaded Differential
Body Material: Steel Iron Stainless Steel

Inlet/Outlet End Connection Style:

CL150 RF Flange NPT
CL300 RF Flange CL250 RF Flange
PN 16/25/40 CL600 RF Flange
Inlet/Outlet Pipe Size: Inches / mm

Steam Conditions:

Maximum Normal Minimum

Inlet Pressure (psig/bar)

Inlet Temperature (°F/°C)

Outlet Pressure (psig/bar)

Flow (pounds/h or kg/hr)

Performance Required:

Accuracy Requirements: ≤10% ≤ 2 0%
≤30% ≤40%

15

Bulletin 71.2:92S

Industrial Regulators

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75069-1872, 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.sherregulators.com

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 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 product remains solely with the purchaser.

Natural Gas Technologies

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75069-1872, USA
Tel: [phone]
Outside U.S. [phone]

Asia-Pacic

Singapore 128461, Singapore
Tel: [phone]

Europe

Bologna 40013, Italy
Tel: [phone]
Gallardon 28320, France
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., 1984, 2011; All Rights Reserved