Emerson 627F Instruction Manual

Instruction Manual Form 5282

April 2012

Type 627F Pilot-Operated Pressure Reducing Regulator

Type 627F

W5607

Figure 1. Type 627F Pilot-Operated Pressure Reducing Regulators

WARNING

Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion and/or re causing property damage and personal injury or death.

Fisher® regulators must be installed, operated, and maintained in accordance with federal, state, and local codes, rules and regulations, and Emerson Process Management Regulator Technologies, Inc. (Regulator Technologies) instructions.

W5641

If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition.

Call a gas service person to service the unit. Only a qualied person must install or service the regulator.

Introduction

Scope of the Manual

This manual provides instructions for installation, adjustment, maintenance, and parts ordering information for the Type 627F regulator.

www.sherregulators.com

D101545X012

Type 627F

Specications

The Specications section gives some general specications for the Type 627F regulator. The nameplates

give detailed information for a particular regulator as it comes from the factory.

Body Sizes and End Connection Styles

Ductile iron: 3/4, 1, or 2 NPT Steel: 3/4, 1, or 2 NPT;

NPS 1 or 2 / DN 25 or 50, CL150 RF, CL300 RF, CL600 RF, PN 16/25/40 RF Flanged

Minimum Pressure Differential

20 psid / 1.4 bar d

Maximum Inlet and Differential Pressures

(1)

See Table 2

Maximum Emergency Outlet Pressure

(1)

250 psig / 17.2 bar for all Type 627F actuators and Type 6351F pilot components

Outlet Pressure Ranges

5 to 100 psig / 0.34 to 6.9 bar See Table 1

Orice Sizes

3/8 x 1/8, 3/8 x 1/4, 3/8, or 1/2 inch /

9.5 x 3.2; 9.5 x 6.4; 9.5; or 13 mm

Temperature Capabilities

(1)

-20 to 180°F / -29 to 82°C

Flow Coefcients

See Table 4

IEC Sizing Coefcients

See Table 5

Pressure Registration

External

Pilot Supply Connection

1/4 NPT

Pilot Sense Connection

1/4 NPT

Body Tap Connection

1/4 NPT (ductile iron body only)

Approximate Weights

NPT body with Ductile iron or steel casings:

10 pounds / 4 kg NPT body with aluminum casings:

6.3 pounds / 3 kg Flanged body with steel casings: 18 pounds / 8 kg Flanged body with Ductile iron casings: 14 pounds / 6 kg

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

Table 1. Outlet Pressure Ranges

PILOT CONTROL SPRING INFORMATION

Wire Diameter Free Length

Unpainted

Red

0.142

0.192

3.61

4.88

PILOT TYPE

6351F

OUTLET PRESSURE RANGE

psig bar inches mm inches mm

5 to 35

35 to 100

0.34 to 2.4

2.4 to 6.9

Part Number Color Code

1B788327022 1K748527022

Table 2. Maximum Allowable Inlet Pressures and Pressure Differential

ORIFICE SIZE MAXIMUM INLET PRESSURE MAXIMUM PRESSURE DIFFERENTIAL

inch mm psig bar psig bar

3/8 x 1/8 3/8 x 1/4

3/8 1/2

9.5 x 3.2

9.5 x 6.3

9.5 13

250 250 250 125

17.2

8.6

250 250 250 125

2.13

2.19

54.1

55.6

17.2

8.6

FIELD INSTALLED

INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE

DOWNSTREAM CONTROL LINE

Type 627F

FILTER (FACTORY INSTALLATION OPTIONAL)

PILOT DIAPHRAGM

A6558

INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE

RESTRICTION (BLEED)

PILOT ADJUSTING SCREW

TYPE 6351F PILOT

TYPE 627F REGULATOR

PILOT SUPPLY TUBING (FACTORY INSTALLATION OPTIONAL)

SPRING SEAT BOLT (THIS IS NOT AN ADJUSTING SCREW)

TENSION SPRING

Figure 2. Type 627F Pilot-Operated Pressure Reducing Regulator Operational Schematic

MAIN REGULATOR DIAPHRAGM

LEVER

VALVE DISK

Table 3. Additional Specications

ALLOWABLE INLET PRESSURE RANGE FOR MAINTAINING OUTLET PRESSURE

ORIFICE SIZE

5 psig / 0.34 bar 30 psig / 2.1 bar 40 psig / 2.8 bar 60 psig / 4.1 bar 100 psig / 6.9 bar

inch mm psig bar psig bar psig bar psig bar psig bar

3/8 x 1/8 3/8 x 1/4

3/8 1/2

1. For best performance, outlet pressure setting should be made using an inlet pressure that is midway between the highest and lowest expected inlet pressure.

9.5 x 3.2

9.5 x 6.4

9.5 13

30 to 250 30 to 250 30 to 250 25 to 125

2.1 to 17.2

1.7 to 8.6

Description

WITHIN ±1% OF THE ABSOLUTE OUTLET PRESSURE SETTING

55 to 250 55 to 250 55 to 250 50 to 125

3.8 to 17.2

3.4 to 8.6

65 to 250 65 to 250 65 to 250 60 to 125

4.5 to 17.2

4.1 to 8.6

85 to 250 85 to 250 85 to 250 80 to 125

repositions the valve disk to provide fast response to

(1)

5.9 to 17.2

5.9 to 8.6

125 to 250 125 to 250 125 to 250 120 to 125

system changes. Simultaneously, the pilot amplies

The Type 627F pilot-operated (Type 6351F pilot) pressure reducing regulator (Figure 1) provides economical, accurate pressure control in a wide variety of applications using pressure factor measurement

(xed factor billing). The regulator can be used with

natural gas, air, or a variety of other gases.

system pressure changes to position the main regulator valve disk for precise pressure control.

Inlet pressure is used for the pilot supply pressure.

If downstream ow increases, lowering the outlet

pressure below the regulator setpoint, pressure on the pilot diaphragm and the lever side of the main regulator diaphragm decreases. The pilot opens to

Principle of Operation

The superior performance of a Type 627F regulator is due to the amplifying effect of the pilot and the two-path control system (Figure 2). Changes in outlet pressure act quickly on the main regulator diaphragm which

supply the required loading pressure increase. The increased loading pressure from the pilot overcomes the main regulator spring force, and the main regulator valve disk moves farther open to supply the

required ow.

8.6 to 17.2

8.3 to 8.6

Type 627F

Table 4. Flow Coefcients

ORIFICE SIZE

inches mm C

3/8 x 1/8 9.5 x 3.2 12.5 0.43 29.1 12.5 0.43 29.4 12.5 0.43 29.2

3/8 x 1/4 9.5 x 6.4 50 1.63 30.6 50 1.71 29.3 52 1.66 31.3

3/8 9.5 108 2.99 36.1 108 3.42 31.6 11.5 3.39 33.9

1/2 13 190 4.87 39.0 190 5.29 35.9 200 5.01 39.9

ORIFICE SIZE X

inches mm 3/4 NPT Body NPS 1 / DN 25 Body NPS 2 / DN 50 Body

1/8 3.2 0.54 0.55 0.54

1/4 6.4 0.59 0.54 0.62 0.87

3/8 9.5 0.82 0.63 0.73 0.89

1/2 13 0.96 0.82 1.01 0.86

Wide-Open Wide-Open

When downstream pressure increases due to lowered demand, greater pressure is registered on the pilot diaphragm and the lever side of the main regulator diaphragm. The pilot closes, and the excess loading pressure bleeds off to downstream, through the pilot restriction. With the lower loading pressure, the spring

can move the main regulator disk closer to the orice.

Under no ow conditions, the excess loading pressure

bleeds through the pilot restriction to the downstream system until the loading pressure and outlet pressure equalize. The main valve is closed by the spring and

3/4 NPT BODY NPS 1 / DN 25 BODY NPS 2 / DN 50 BODY

Wide-Open Wide-Open

Table 5. IEC Sizing Coefcients

Wide-Open Wide-Open

0.50

4. Make sure that there is no damage to, or foreign material in the regulator. Ensure that all tubing and piping have been blown free of foreign debris.

5. The regulator may be installed in any position as

long as the ow through the body is in the direction

indicated by the arrow cast on the body and both pilot openings are connected.

6. If continuous operation is required during inspection or maintenance, install a three-valve bypass around the regulator.

the bleed stops.

WARNING

0.79

Installation

Only personnel qualied through training and

experience should install, operate, or maintain this regulator. Regulator operation within ratings does not preclude the possibility of damage from debris in the lines or from external sources. Key numbers referenced in this section are shown in Figures 3 and 4.

1. A regulator should be inspected for damage periodically and after any overpressure condition.

2. Ensure that the operating temperature capabilities

listed in the Specications section are not exceeded.

3. A pressure-relieving or pressure-limiting device must be provided by the user if the inlet pressure can exceed the outlet pressure rating of the downstream equipment.

A regulator may vent some gas to the atmosphere. In hazardous or ammable gas service, vented gas may accumulate and cause personal injury, death, or property damage due to re or explosion. Vent a regulator in hazardous gas service to a remote, safe location away from air intakes or any hazardous area. The vent line or stack opening must be protected against condensation or clogging.

To keep the pilot spring case vent from being plugged or the spring case from collecting moisture or other foreign material, point the vent down or otherwise protect it. To change vent orientation, remove the spring case and remount it on the pilot body.

+ 8 hidden pages

Emerson 627F Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual