Emerson S Series Gas Pressure Regulator User manual

Brand: Emerson

Model: S Series Gas Pressure Regulator

Type: User manual

Emerson S Series Gas Pressure Regulator offers precise pressure regulation and stabilization for medium and low-pressure gas systems. Ideal for residential, commercial, and industrial applications, it ensures steady gas flow for direct combustion equipment, gas pipelines, and more. With pressure ranges from 1.5 to 50 KPa and various actuator and spring options, you can customize it to your specific needs.

S Series

Gas Pressure Regulator

Instruction Manual

D104538X012

April 2022

S Series

WARNING

Contents

1. Introduction ................................................................................................. 3

2. Specications ............................................................................................... 3

3. Main Valve Dimensions and Weights ............................................................ 3

4. Structure and Principle of Operation ............................................................. 4

5. Selection of Actuators and Springs ............................................................... 4

6. Flow Table .................................................................................................... 5

7. Installation and Use ...................................................................................... 6

8. Pressure Regulator Maintenance ................................................................... 7

Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion, re

and/or chemical contamination causing property damage and personal injury or death.

Jeon 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. instructions.

If the regulator vents process uid or a leak develops in the system, service to the unit may be required. Failure to correct

trouble could result in a hazardous condition.

Installation, operation and maintenance procedures performed by unqualied personnel may result in improper

adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Call qualied

personnel when installing, operating and maintaining the S series pressure regulator.

S Series

P1P2

1. Introduction

The S Series pressure regulator is a spring-loaded direct-acting gas pressure regulator.

Applications: pressure regulation and stabilization of medium and low pressure gas pipeline networks, residential quarters,

industrial and commercial users, and direct combustion equipment.

Applicable medium: natural gas, articial gas, liqueed petroleum gas and other non-corrosive gases.

Example: RTZ1-50/0.4-S

It means that this is an S Pressure Regulator, Direct Operated, Fail Open,

with Body Size DN 50 (Inlet), 0.4 MPa Maximum Inlet Pressure.

Figure

2. Specications

• Inlet pressure range, P1: 0.02 to 0.4 MPa

• Outlet pressure range, P2: 1.5 to 50 KPa (please refer to "5. Selection of Actuators and Springs" for details)

• Pressure stabilization accuracy level, AC: up to AC5

• Closing pressure level, SG: up to SG10

• Working temperature, t:

Nitrile (NBR), Standard: -20 to 60°C / -4 to 140°F

Fluorocarbon (FKM): -10 to 60°C /14 to 140°F

Table 1. Flange Rating

TYPE INLET AND OUTLET

FLANGE, DN FLANGE RATING

S50 50

PN1.6 MPa

In line with the

standard HG20592

S65 65

S80 80

S100 100

S150 150

Figure 2

Features

• Modular structure design;

• Fast response speed and large circulation capacity;

• Fully balanced valve core structure, high pressure regulation accuracy;

• Simple structure, convenient operation and maintenance.

3. Main Valve Dimensions and Weights

Table 2. Main Valve Dimensions and Weights (Figure 1)

TYPE DIMENSION, mm WEIGHT, kg

L D H1 H2 H3

S50 254 330 / 436 675 580 207 / 213 37

S65 276 436 / 510 660 / 695 565 / 600 190 / 205 45 / 55

S80 298 436 / 510 / 610 685 / 720 / 725 585 / 620 / 625 216 / 223 / 226 52 / 62 / 72

S100 350 436 / 510 / 610 735 / 770 / 775 615 / 650 /655 248 / 255 / 260 61 / 71 / 81

S150 450 436 / 510 / 710 835 / 870 / 875 630 / 665 / 670 278 / 285 / 290 118 / 128 / 152

Note: Size D is determined by the actuator specications selected for the outlet pressure adjustment range of the pressure regulator, see tables in Section 5.

ADJUSTING SCREW

SPRING COVER

ACTUATOR

VALVE TRIM ASSEMBLY

VALVE BODY

INLET OUTLET

DIAPHRAGM

VALVE STEM

ORIFICE

VALVE DISK SEAL

Model

Maximum Inlet Pressure, MPa

Nominal Size

Direct Operated Regulator, Fail Open

Gas Pressure Regulator

RT Z1 - / 0.4 - S

S Series

4. Structure and Principle of Operation

The S Series pressure regulator is composed of the valve body, valve core assembly, actuator and other parts.

The principle of operation of the pressure regulator (see Figure 2): The outlet pressure of the regulator is set through the

adjusting screw of the main actuator spring. When gas consumption increases at downstream, the outlet pressure, P2 tends

to drop.

This pressure drop is sensed below the main diaphragm, causing the main diaphragm to move down, as a result of the acting

main actuator spring. The main actuator spring overcomes the pressure beneath the diaphragm and pushes the diaphragm

downward, causing the valve disk, which is connected through the stem, to move away from the orice and creates an

opening. This will allow the gas to ow downstream keeping the outlet pressure constant.

When the amount of gas increases at the downstream of the regulator, the operating process will be in reverse until the

regulator is closed.

5. Selection of Actuators and Springs

ACTUATOR PRESSURE REGULATING

RANGE, KPa

DIAMETER OF SPRING WIRE,

mm SPRING CODE COLOR

SNL436

1.5 - 2.5 4.5 JJJJ43CXT03 Black

2.5 - 4 5.5 JJJJ43CXT04 White

4 - 8 7.0 JJJJ43CXT05 Green

8 - 12 7.5 JJJJ43CXT06 Blue

12 - 15 9.0 JJJJ43CXT07 Red

SNL330 25 - 50 9.0 JJJJ43CXT08 Zinc-coated

6.0 JJJJ43CXT09 Zinc-coated

Table 3. Type S50

ACTUATOR PRESSURE REGULATING

RANGE, KPa

DIAMETER OF SPRING WIRE,

mm SPRING CODE COLOR

SNL510

1.5 - 2.5 6.0 JJJJ44CXT03 Black

2.5 - 4 7.0 JJJJ44CXT04 White

4 - 8 8.0 JJJJ44CXT05 Green

8 - 12 9.0 JJJJ44CXT06 Blue

12 - 15 9.0 JJJJ43CXT07 Red

SNL436 25 - 50 9.0 JJJJ43CXT08 Zinc-coated

6.0 JJJJ43CXT09 Zinc-coated

Table 4. Type S65

ACTUATOR PRESSURE REGULATING

RANGE, KPa

DIAMETER OF SPRING WIRE,

mm SPRING CODE COLOR

SNL610 1.5 - 2.5 6.0 JJJJ45CXT01 Purple

2.5 - 4 8.0 JJJJ45CXT02 Gray

SNL510 4 - 8 8.0 JJJJ44CXT05 Green

8 - 12 9.0 JJJJ44CXT06 Blue

SNL436

12 - 15 9.0 JJJJ43CXT07 Red

25 - 50 9.0 JJJJ43CXT08 Zinc-coated

6.0 JJJJ43CXT09 Zinc-coated

Table 5. Types S80 and S100

ACTUATOR PRESSURE REGULATING

RANGE, KPa

DIAMETER OF SPRING WIRE,

mm SPRING CODE COLOR

SNL710 1.5 - 2.5 7.0 JJJJ46CXT02 Red

2.5 - 4 8.0 JJJJ46CXT03 Zinc-coated

SNL510 4 - 8 8.0 JJJJ44CXT05 Green

8 - 12 9.0 JJJJ44CXT06 Blue

SNL436

12 - 15 9.0 JJJJ43CXT07 Red

25 - 50 9.0 JJJJ43CXT08 Zinc-coated

6.0 JJJJ43CXT09 Zinc-coated

Table 6. Type S150

Note: When selecting the spring, choose the set point in the middle of the spring pressure range for better operation.

S Series

OUTLET

PRESSURE INLET PRESSURE, MPa

KPa 0.02 0.05 0.1 0.2 0.25 0.3 0.4

1.5 270 500 700 1000 1100 1150 1250

2.5 270 487 700 1000 1100 1150 1250

3.0 270 487 700 1000 1100 1150 1250

4.0 270 487 700 1000 1100 1150 1250

6.0 270 474 700 1000 1100 1150 1250

8.0 240 474 700 1000 1100 1150 1250

10 230 460 700 1000 1100 1150 1250

12 192 460 700 1000 1100 1150 1250

15 167 448 700 1000 1100 1150 1250

25 - - - - 385 700 1000 1100 1150 1250

30 - - - - 330 700 1000 1100 1150 1250

50 - - - - - - - - 700 1000 1100 1150 1250

Table 7. Type S50

6. Flow Table

Table

8. Type S65

OUTLET

PRESSURE INLET PRESSURE, MPa

KPa 0.02 0.05 0.1 0.2 0.25 0.3 0.4

1.5 320 570 1100 1300 1500 1700 2000

2.5 450 700 1200 1600 1800 2000 2400

3.0 400 700 1200 1600 1800 2000 2400

4.0 380 700 1200 1600 1800 2000 2400

6.0 360 700 1200 1600 1800 2000 2400

8.0 330 700 1200 1600 1800 2000 2400

10 300 700 1200 1600 1800 2000 2400

12 240 700 1200 1600 1800 2000 2400

15 200 700 1192 1600 1800 2000 2400

25 - - - - 600 1153 1600 1800 2000 2400

30 - - - - 450 1100 1600 1800 2000 2400

50 - - - - - - - - 1025 1600 1800 2000 2400

Table 9. Type S80

OUTLET

PRESSURE INLET PRESSURE, MPa

KPa 0.02 0.05 0.1 0.2 0.25 0.3 0.4

1.5 600 1200 1500 2000 2200 2500 3000

2.5 700 1200 1800 2200 2500 2800 3200

3.0 700 1200 1800 2200 2500 2800 3200

4.0 700 1200 1800 2200 2500 2800 3200

6.0 650 1200 1800 2200 2500 2800 3200

8.0 550 1100 1800 2200 2500 2800 3200

10 550 1100 1780 2200 2500 2800 3200

12 500 1000 1770 2200 2500 2800 3200

15 240 1000 1780 2200 2500 2800 3200

25 - - - - 850 1740 2200 2500 2800 3200

30 - - - - 850 1700 2200 2500 2800 3200

50 - - - - - - - - 1540 2200 2500 2800 3200

OUTLET

PRESSURE INLET PRESSURE, MPa

KPa 0.02 0.05 0.1 0.2 0.25 0.3 0.4

1.5 600 1200 1500 2000 2200 2500 3000

2.5 700 1200 1800 2200 2500 2800 3200

3.0 700 1200 1800 2200 2500 2800 3200

4.0 700 1200 1800 2200 2500 2800 3200

6.0 650 1200 1800 2200 2500 2800 3200

8.0 550 1100 1800 2200 2500 2800 3200

10 550 1100 1780 2200 2500 2800 3200

12 500 1000 1770 2200 2500 2800 3200

15 240 1000 1780 2200 2500 2800 3200

25 - - - - 850 1740 2200 2500 2800 3200

30 - - - - 850 1700 2200 2500 2800 3200

50 - - - - - - - - 1540 2200 2500 2800 3200

Table

10. Type S100

OUTLET PRESSURE INLET PRESSURE, MPa

KPa 0.02 0.05 0.1 0.2 0.25 0.3 0.4

1.5 1500 2400 3500 4000 4200 4500 5500

2.5 1714 2798 4000 4400 4800 5000 6000

3.0 1674 2783 4000 4400 4800 5000 6000

4.0 1587 2750 4000 4400 4800 5000 6000

6.0 1440 2694 3987 4400 4800 5000 6000

8.0 1326 2653 3980 4400 4800 5000 6000

10 959 2537 3955 4400 4800 5000 6000

12 800 2500 3900 4400 4800 5000 6000

15 - - - - 2400 3919 4400 4800 5000 6000

25 - - - - 2236 3873 4400 4800 5000 6000

30 - - - - 2040 3815 4400 4800 5000 6000

50 - - - - - - - - 3500 4400 4800 5000 6000

Table 11. Type S150

Note:

• The data in the table is the ow rate with relative density of 0.61 for natural gas under standard conditions.

For other media, the data in the table should be multiplied by the corresponding factor.

Conversion factor: Articial Gas: 1.17, Butane: 0.55, Propane: 0.63, Air: 0.78, Nitrogen: 0.79

• “- - - -” means unavailable

• In order to make the pressure regulator work normally, the inlet and outlet pressure in a corresponding table should be

indicated when ordering if the ow rate used recently is less than 15%.

S Series

WARNING

7. Installation and Use

1. Installation

Installation, operation and maintenance procedures performed by unqualied personnel may result in improper

adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Only a qualied

person shall install, operate and maintain the unit.

The user must train relevant personnel or contact the after-sales service of the company.

1) Install the regulator where it is far from re source, vibration; and the environment temperature meet requirement, heat

tracing is necessary if the installation place temperature is lower than requirement.

2) Ensure that pressure rate of the pipeline is corresponding with the pressure range indicated on the regulator nameplate.

3) Ensure that ow arrow direction on the regulator is corresponding with pipeline ow direction.

4) Clean the pipeline before installing the regulator.

5) Install the regulator horizontally. The regulator cannot be installed forcefully when it is connected to the front and

rear pipelines.

6) When there is a fast opening or closing combustion chamber or valve behind the regulator, there should be a certain

volume to avoid drastic rise or fall of pressure caused by the rapid changes in ow rate.

7) Filter must be installed on the upstream of the regulator, and there should be an adequate straight pipeline downstream

of the regulator. The pressure sensing line measuring point must be located 4 to 6 times the pipe diameter downstream of

the regulator. It is recommended that the ow rate in the downstream pipe is ≤30m/s, and the diameter of the straight pipe

should be larger than the outlet pipe of the regulator if necessary. (Installation sketch see Figure 3).

Forceful installation is strictly prohibited; during pipeline pressure test and purging, please use a blind plate to completely

block the pressure regulator or remove the pressure regulator, otherwise the pressure regulator is susceptible to damage.

Figure 3

Figure 4

BASE

ADJUSTING SCREW

SIGNAL PIPE

DN 4 to 6

SPRING

COVER

INLET

OUTLET

VENT

PRESSURE METER

WARNING

S Series

2. Use

2.1 Start-up

1) A lter should be installed on the upstream of the regulator;

2) Open the shut-off valve;

3) Slowly open the inlet valve upstream of the regulator;

4) Slightly open the outlet valve downstream of the regulator and observe whether the outlet pressure is the desired set

pressure, otherwise set according to Section 2.2;

5) Observe for a while until the ow becomes stable;

6) Fully open the outlet valves of the regulator.

2.2 Pressure Regulator Outlet Pressure Setting

To change the outlet pressure of the regulator, slowly turn the spring cover to open, then, slowly turn the adjusting screw

(clockwise to increase and counter-clockwise to decrease the outlet pressure) to meet the pressure requirement. When

adjusting the pressure, make sure that the length of thread engagement between the spring cover and the base cannot be less

than 10 mm.

8. Pressure Regulator Maintenance

General Rules of Maintenance

Close the inlet and outlet valve of the regulator before maintenance, then release all the pressure inside the regulator; avoid

damaging orice, diaphragm etc. parts during assembly or disassembly; check if each moveable parts can be moved freely;

Setup the regulator according to Clause 2. The Use of Regulator after maintenance, and check leakage on each sealing part by

soap solution.

Our company provides training services to maintenance personnel. For other information, please contact our after-sales

service department.

1. Routine Maintenance

The management department of the pressure regulator shall determine the daily maintenance cycle according to the gas

quality and use situation to ensure the safe use of gas:

1) Check the pressure regulator for external leakage using a gas alarm instrument (or soap solution).

2) Observe the pressure gauge reading and check the outlet pressure of the pressure regulator.

3) Clean the outside of the pressure regulator.

2. Regular Inspection

It is recommended to carry out regular cleaning and maintenance of the inside of the pressure regulator every 3-6 months on the

basis of gas quality and use situation (when the medium is articial gas, it is recommended to shorten the maintenance cycle to

1-3 months); check or replace the rubber members prone to swelling or aging to ensure safe gas supply and normal use.

The management department of the pressure regulator should determine the regular maintenance cycle according to the gas

quality and use situation to ensure the normal operation of the pressure regulator:

1) It is recommended to check the lockup pressure of the pressure regulator at least every three months: connect a pressure

gauge to the outlet end of the pressure regulator, turn on the switch, slowly close the ball valve at the outlet end of the

pressure regulator, record the lockup pressure three minutes later and check whether it is within the normal range. When

the lockup pressure of the pressure regulator is normal, there is no need to disassemble the pressure regulator.

2) It is recommended to check the inlet pressure setting of the disconnector at least every three months.

3) It is recommended to clean and maintain the internal parts of the pressure regulator and shut-off valve every three to six

months, check the vulnerable parts such as the disk seal , the diaphragm and the O-ring, and replace the swollen, aging

seals with uneven indentation.

4) Check the wear and deformation of key components in the pressure regulator, and replace if necessary.

S Series

SIZE, DN ACTUATOR OUTLET PRESSURE, KPa DISK MATERIAL SPARE KIT

SNL436 1.5 - 25 Nitrile (NBR) JJJJB2BX001

SNL330 25 - 50 Nitrile (NBR) JJJJB2BX002

SNL436 1.5 - 25 Fluorocarbon (FKM) ERAA49669A0

SNL330 25 - 50 Fluorocarbon (FKM) ERAA49670A0

SNL510 1.5 - 12 Nitrile (NBR) JJJJB3BX001

SNL436 12 - 25 Nitrile (NBR) JJJJB3BX002

SNL436HP 25 - 50 Nitrile (NBR) JJJJB3BX002

SNL510 1.5 - 12 Fluorocarbon (FKM) ERAA49673A0

SNL436 12 - 25 Fluorocarbon (FKM) ERAA49674A0

SNL436HP 25 - 50 Fluorocarbon (FKM) ERAA49674A0

SNL610 1.5 - 4 Nitrile (NBR) JJJJB4BX001

SNL510 4 - 12 Nitrile (NBR) JJJJB4BX002

SNL436 12 - 25 Nitrile (NBR) JJJJB4BX004

SNL436HP 25 - 50 Nitrile (NBR) JJJJB4BX004

SNL610 1.5 - 4 Fluorocarbon (FKM) ERAA49678A0

SNL510 4 - 12 Fluorocarbon (FKM) ERAA49679A0

SNL436 12 - 25 Fluorocarbon (FKM) ERAA49680A0

SNL436HP 25 - 50 Fluorocarbon (FKM) ERAA49680A0

4. Spare Parts Package of the S Series Pressure Regulator

3. Troubleshooting

ISSUE CAUSE TROUBLESHOOTING

Reduced outlet pressure

Inlet pressure is too low

The actual ow exceeds the design ow of the

pressure regulator

There are too many foreign materials inside the

pressure regulator and jamming occurs

Choose a suitable pressure regulator, and clean the

inside of the pressure regulator

Lockup pressure rises

Diaphragm is swollen, aging or damaged Replace the diaphragm

Valve port sealing gasket is swollen and aging Replace the swollen gasket

The O-ring in the disk assembly is damaged Replace the O-ring

Foreign materials are adsorbed at the valve port or

damage happens Clean or replace the valve port

The pressure regulator is straight through Adjusting spring is compressed by outrange Replace the relatively hard spring

Outlet Pressure Unstable

Inlet pressure unstable

The actual ow rate is much lower than the rated

ow rate

Contact operation management department

Change to a suitable regulator

S Series

4. Spare Parts Package of the S Series Pressure Regulator (continued)

SIZE, DN ACTUATOR OUTLET PRESSURE, KPa DISK MATERIAL SPARE KIT

100

SNL610 1.5 - 4 Nitrile (NBR) JJJJB5BX001

SNL510 4 - 12 Nitrile (NBR) JJJJB5BX002

SNL436 12 - 25 Nitrile (NBR) JJJJB5BX003

SNL436HP 25 - 50 Nitrile (NBR) JJJJB5BX003

SNL610 1.5 - 4 Fluorocarbon (FKM) ERAA49684A0

SNL510 4 - 12 Fluorocarbon (FKM) ERAA49685A0

SNL436 12 - 25 Fluorocarbon (FKM) ERAA49686A0

SNL436HP 25 - 50 Fluorocarbon (FKM) ERAA49686A0

150

SNL710 1.5 - 4 Nitrile (NBR) JJJJB6BX001

SNL510 4 - 12 Nitrile (NBR) JJJJB6BX002

SNL436 12 - 25 Nitrile (NBR) JJJJB6BX003

SNL436HP 25 - 50 Nitrile (NBR) JJJJB6BX003

SNL710 1.5 - 4 Fluorocarbon (FKM) ERAA49690A0

SNL510 4 - 12 Fluorocarbon (FKM) ERAA49691A0

SNL436 12 - 25 Fluorocarbon (FKM) ERAA49692A0

SNL436HP 25 - 50 Fluorocarbon (FKM) ERAA49692A0

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