Emerson 92W Instruction Manual

Instruction Manual Form 5237

February 2009

Type 92W Liquid Regulator

Introduction

Scope of the Manual

This instruction manual provides installation, maintenance, and parts ordering information for the Type 92W liquid pressure-reducing regulator, which includes the Type 6492H or 6492L pilot. Accessories used with this regulator, including any pressure-loading device for a Type 6492H or 6492L pilot with tapped spring case, are covered in other manuals for those accessories.

Product Description

The Type 92W pressure-reducing regulator for liquid service includes either a Type 6492H or a Type 6492L pilot (Figure 1). Both pilots have a friction-reducing bellows seal on the stem. They offer precise pressure-setting adjustment plus high sensitivity to downstream pressure changes.

Type 92W

W4086-3

NPS 1, NPT

STEEL MAIN VALVE WITH TYPE 6492H PILOT

These pilots are available in either a standard version with a drilled spring case vent, or an optional version with a tapped spring case vent and a sealed adjusting screw for pressure-loading service. A Fisher® 67 or 1301 Series regulator or a 670 Series panel-mounted regulator may be used to load the pilot of a version for pressure-loading service.

Specications

Specications for the Type 92W regulator are found in the Specications section.

Installation

WARNING

Personal injury, equipment damage, or leakage due to escaping liquid or bursting of pressure-containing parts may result if this regulator is

W4088-1

NPS 3 (DN 80), FLANGED

CAST IRON MAIN VALVE WITH TYPE 6492L PILOT

Figure 1. Typical Connections

overpressured or is installed where service conditions could exceed the limits

given in the Specications section and

on the appropriate nameplates, or where conditions exceed any ratings of the adjacent piping or piping connections.

www.emersonprocess.com/regulators

D101268X012

Type 92W

Specications

Main Valve Body Sizes and End Connection Styles

BODY SIZE,

NPS (DN)

1, 1-1/2, and 2 NPT NPT

1, 1-1/2, 2, 2-1/2,

3, and 4

(25, 40, 50, 65,

80, and 100)

END CONNECTION STYLE AND RATING

Cast Iron Body Steel Body

Flat-faced CL125B

or raised-faced

CL250B anged

Raised-faced CL150,

CL300, or CL600 anged

Maximum Inlet and Pilot Supply Pressure

(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 Differential Pressure

(1)

150 psig (10,3 bar) or body rating limit, whichever is lower

Minumum Differential Pressure

(1)

20 psig (1,4 bar)

Outlet (Control) Pressure Ranges

See Table 1

Maximum Outlet Pressures

(1)

See Table 2

Maximum Allowable Loading Pressure for Pilot with Tapped Spring Case

(1)

Combination of pilot control spring setting and spring case loading pressure must not exceed 150 psig (10,3 bar) for Type 6492H pilot or 25 psig (1,7 bar) for Type 6492L pilot

Main Valve Port Diameters and Flow Coefcients

BODY SIZE,

NPS (DN)

1 (25)

1-1/2 (40)

2 (50)

2-1/2 (65)

3 (80)

4 (100)

Maximum Material Temperature Capabilities

PORT DIAMETER

Inches mm

7/8

1-1/8

1-29/64

1-5/8

2-1/16

2-3/8

22,2 28,6 36,9

41,3 52,4 60,3

REGULATING

CAPACITIES

10 20 35

48 66 78

(1)

Cast Iron Construction: 406°F (208°C)

Steel Construction: 500°F (260°C)

Pressure Registration

External through downstream control line

Downstream Control Line Connection

NPS 1, 1-1/2, or 2 (DN 25, 40, or 50) Body Size:

1/4 NPT female in main valve cylinder spacer

NPS 2-1/2, 3, or 4 (DN 65, 80, or 100) Body Size:

1/4 NPT female in pilot body

Pilot Spring Case Vent

1/8-inch (3,18 mm) drilled hole (standard pilot) or 1/4 NPT female tapping for pressure loading service (optional pilot)

Approximate Weights

BODY SIZE,

NPS (DN)

1 (25) 1-1/2 (40)

2 (50)

2-1/2 (65) 3 (80) 4 (100)

END CONNECTION

NPT or anged NPT or anged

NPT

Flanged

Flanged Flanged Flanged

APPROXIMATE WEIGHTS

Pounds kg

32 44

55 67

90 115 165

14 20

25 30

41 52 75

0.62

0.71

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

To avoid such injury or damage, provide pressure-relieving or pressure-limiting devices to prevent service conditions from exceeding those limits.

Liquid pressure control systems should be designed using good engineering practices to eliminate quick starting or

Additionally, the pilot could be broken off the main valve by physical damage,

stopping of the ow stream, which can

produce water hammer. .

causing personal injury and property damage due to escaping liquid. To avoid such injury and damage, install the regulator in a safe location where it is protected from physical damage.

1. Only personnel qualied through training and

experience should install, operate, and maintain a Type 92W regulator. Before installation, make sure that there is no damage to, or debris in, the regulator. Also make sure that all tubing and piping are clean and unobstructed.

CAUTION

Table 1. Outlet (Control) Pressure Ranges

OUTLET (CONTROL) PRESSURE RANGES

Psig bar

Type 6492L Pilot Type 6492H Pilot Type 6492L Pilot Type 6492H Pilot

2 to 6

5 to 15

13 to 25

CONSTRUCTION

With Type 6492H pilot

With Type 6492L pilot

10 to 30 25 to 75

70 to 150

Table 2. Maximum Outlet Pressures

MAXIMUM OPERATING

OUTLET PRESSURE

150 psig

(10,3 bar)

25 psig

(1,7 bar)

0,14 to 0,41

0,34 to 1,0 0,90 to 1,7

MAXIMUM EMERGENCY OUTLET PRESSURE

(IF EXCEEDED, PRESSURE VESSEL INTEGRITY MAY NOT

BE RETAINED AND PERSONAL INJURY OR PROPERTY

Cast Iron Main Valve

and Pilot Body

250 psig (17,2 bar) or main valve

body rating limit, whichever is lower

50 psig (3,4 bar) 125 psig (8,6 bar)

0,69 to 2,1

1,7 to 5,2

4,8 to 10,3

DAMAGE COULD RESULT)

Type 92W

PILOT CONTROL SPRING

COLOR CODE (SEE PARTS

LIST FOR PART NUMBER)

Yellow Green

Red

Steel Main Valve

and Pilot Body

300 psig (20,7 bar) or main valve

body rating limit, whichever is lower

2. A Type 92W regulator may be installed in any

orientation, as long as ow through the regulator

matches the direction of the arrow on the main valve body.

3. Apply liquid-compatible pipe compound to the male pipeline threads for an NPT body, or use suitable

line gaskets for a anged body. Use acceptable piping

procedures when installing the regulator. .

4. If continuous operation of the system is required during inspection and maintenance, install a three-valve

bypass around the regulator. If the owing medium

contains solids, install a properly sized strainer upstream of the regulator.

Note

A regulator that has the Type 6492H or 6492L pilot with a 1/8-inch (3,2 mm) drilled hole in the spring case may function improperly if this spring case vent hole becomes clogged. Install and maintain such regulator so that the spring case vent hole stays clear.

5. As shown in Figure 2, connect a control line as large as possible but no smaller than 3/8-inch (9,5 mm) diameter bushed down to the 1/4 NPT connection in the cylinder spacer (NPS 1, 1-1/2, or 2 body size) (DN 25, 40, or 50) or the pilot body (NPS 2-1/2, 3, or 4 body size) (DN 65, 80, or 100). With the NPS 2-1/2, 3, or 4 (DN 65, 80, or 100 body size, the pilot may be mounted as shown in Figure 6 so that the control line connection faces either upstream or downstream.

6. Locate the control line connection at least 10 pipe diameters away from the regulator or swage and in a section of straight pipe. .

7. Do not locate the control line connection in a gate, plug, or check valve; or in an elbow, swage, or other area of the pipeline where turbulence or abnormal velocities may occur; or in a large-volume vessel that can cause noticeable control lag.

8. Install a shutoff valve (not a needle valve) in the control line to isolate the pilot during maintenance.

9. Install a pressure gauge in the control line, or near the regulator, to aid in setting the outlet pressure.

10. With a pressure-loaded or on-off pilot, connect the pressure-loading or on-off piping or tubing to the 1/4 NPT connection in the tapped pilot spring case.

11. The pressure setting of the regulator is determined by:

• The pilot control spring adjustment on a standard

pilot, or .

• The pressure-loading device in conjunction with the

control spring adjustment on a pressure-loaded pilot. In both cases, check these settings to make sure they are correct for the application.

Startup and Adjustment

Note

The maximum inlet pressure for a specic

construction is stamped on the main valve nameplate. Use pressure gauges to monitor upstream and downstream pressures during startup. .

Type 92W

STRAINER

CONTROL LINE CONNECTION

CONTROL LINE SHUTOFF VALVE

AIR LOADING REGULATOR

STRAINER

NEEDLE VALVE

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

CONTROL LINE CONNECTION

CONTROL LINE SHUT OFF VALVE

BLOCK VALVE

BYPASS LINE

16A7958-B A2607-1

BLOCK VALVES

WITH STANDARD PILOT WITH PRESSURE-LOADED PILOT

VENT VALVE

Figure 2. Typical Installations

Adjustment

On a regulator with a standard or pressure-loaded Type 6492H or 6492L pilot, loosen the hex nut

(key 16, Figure 4). Turn the adjusting screw (key 15, Figure 4) into the spring case to increase the downstream pressure. Turn the adjusting screw out of the spring case to decrease the downstream pressure. When the required downstream pressure is maintained for several minutes, tighten the hex nut to lock the adjusting screw in position.

n a regulator with a pressure-loaded Type 6492H

or 6492L pilot, also refer to the instruction manual of

the pressure-loading device for downstream pressure adjustment procedures. Make sure that the combined pilot control spring setting pressure and spring case loading pressure does not exceed 150 psig (10,3 bar) for the Type 6492H pilot or 25 psig (1,7 bar) for the Type 6492L pilot. For example, combining a 5 psig (0,34 bar) spring setting pressure and a 10 psig (0,69 bar) spring case loading pressure results in a regulator pressure of 15 psig (1,0 bar).

Startup with New Regulator Installation

1. Remove all pilot control spring compression by turning the adjusting screw out of the spring case according to the adjustment procedure.

2. Slowly open the upstream block valve.

3. Open the downstream block valve.

4. Open the control line shutoff valve.

5. If a bypass is used, slowly close the bypass line block valve. .

6. Perform the adjustment procedure until the downstream pressure reaches the desired setting.

BLOCK VALV E

BYPASS LINE

16A7958-B 16A1547-A A3334

BLOCK VALVES

VENT VALVE

Startup with Existing Regulator Installation After Normal Shutdown

1. Open the upstream and downstream block valves and let the regulator take over control at the existing pilot control spring setting. .

2. If a bypass line is used, slowly control the bypass line block valve. .

Shutdown

1. If a bypass line is used, slowly open the bypass line block valve while monitoring the downstream pressure.

2. Close the control line shutoff valve.

3. Close the downstream block valve.

4. Close the upstream block valve.

5. If a pressure-loaded or on-off pilot is used, close the needle valve to the pilot. .

6. Vent the regulator and control line to release any trapped pressure.

Principle of Operation

Pilot supply pressure is piped from the main valve inlet (Figure 3) 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 spring forces the pilot valve plug open to increase the loading pressure on the main valve

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