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 -

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

1-1/2

2 50

2-1/2

6 x 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

115

165

2.50

2.62

2.44

2.50

2.62

2.44

2.50

15 20

25 30

41 52 75

63.5

66.6

62.0

63.5

66.6

62.0

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

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

• 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

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

0.62

0.71

IEC SIZE COEFFICIENTS

0.73

pressure provided by the solenoid or switching valve.

0.51

0.48

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

0.84

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.

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

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