Samson 2357-3 Service manual

Self-operated Pressure Regulators

Pressure Build-up Regulator

Type 2357-3

Fig. 1 · Type 2357-3 with non-return unit at port C

Edition February 2008

Mounting and

Operating Instructions

EB 2559 EN

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . . . . 4

2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Shut-off valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Set point adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Dimensions in mm (accessories) . . . . . . . . . . . . . . . . . . . . . . . 8

2EB 2559 EN

Contents

EB 2559 EN 3

Safety instructions

General safety instructions

The regulators must be installed, started up and serviced by fully trained and

qualified personnel only, observing the accepted industry codes and

practices. Make sure employees or third persons are not exposed to any

danger.

All safety instructions and warnings in these instructions, particularly those

concerning installation, start-up, and maintenance, must be observed.

For appropriate operation, make sure that the regulator is only used in

applications where the operating pressure and temperatures do not exceed

the operating values based on the sizing data submitted in the order.

Note that the manufacturer does not assume any responsibility for damage

caused by external forces or any other external factors.

Any hazards which could be caused in the regulator by the process medium

or operating pressure are to be prevented by means of appropriate

measures.

Proper shipping and appropriate storage are assumed.

4EB 2559 EN

1 Design and principle of

operation

The pressure regulator is especially designed

for the use in cryogenic service to keep the

pressure constant to the adjusted set point.

The pressure regulator consists of a valve with

three ports A, B and C, a spring-loaded oper-

ating bellows with set point adjuster and a tu-

bular plug.

The pressure regulator operates as a pressure

build-up regulator with safety function when

the direction of flow is from port A to port B.

The valve is open when no pressure is ap-

plied. The pressure downstream of the valve is

transmitted to the operating bellows (4). The

positioning force produced by this pressure

moves the pressure build-up plug (1), which is

firmly attached to the plug sleeve, depending

on the spring force adjustable at the set point

adjuster (6). The valve closes when the pres-

sure downstream of the valve has assumed

the adjusted set point.

Functioning as a pressure build-up regula-

tor, the regulator also operates as a safety

valve for the pressure chamber upstream of

port A. When the pressure rises above the set

point by approx. 5 bar, the positioning force

overcomes the force of the closing spring (8),

causing the pressure build-up plug (1) to

open and the pressure is relieved to ports B

and C.

Functioning as a pressure relief valve, the

medium flows from port B to C. The tubular

plug seals off the operating bellows when

there is no pressure drop across port B and C.

The pressure at port B acts on the operating

bellows (4). The positioning force produced

by this pressure opposes the adjustable

spring force of the set point spring (5) and

opens the tubular plug (2) when the pressure

rises above the set point by approx. 0.5 bar.

The pressures are equalized and the medium

escapes through the inside of the tubular plug

over port C.

As a pressure relief valve, the regulator can

be optionally equipped with a non-return

unit (10). It prevents the medium from flowing

back to port C and allows maintenance work

to be performed on the regulator without hav-

ing to empty the container first.

Design and principle of operation

EB 2559 EN 5

Design and principle of operation

Fig. 2 · Sectional drawings

1 Pressure build-up plug

2 Tubular plug

3 Soldering nipple with

ball-type bushing

(accessories)

4 Operating bellows

5 Set point spring

6 Set point adjuster with

lock nut

7 Body

8 Closing spring

9 Strainer optionally in

A or B (accessories)

10 Non-return unit

(accessories)

2 Installation

2.1 Mounting position

The pressure regulator must be in-

stalled with the actuator housing

pointing downward (port C facing

upward).

The ports A and B are marked on

the body.

The required accessories are listed in Table 2

on page 9.

Installation as build-up pressure regulator

with safety function:

– Direction of flow from port Ato port B

Installation as pressure relief valve:

– Direction of flow from port Bto port C

NOTICE

Make sure that any impurities carried along

by the process medium in the connected pipe-

lines do not impair the proper functioning and

especially the tight shut-off of the regulator.

2.2 Shut-off valve

We recommend installing a hand-operated

shut-off valve both upstream of the strainer

and downstream of the regulator to be able to

shut down the plant for cleaning.

Install a pressure gauge both upstream and

downstream of the regulator to monitor the

pressures prevailing in the plant.

6EB 2559 EN

Installation

3 Operation

3.1 Set point adjustment

The pressure regulator is adjusted at the

factory to the set points listed in the table.

However, you can change them by turning

the set point adjuster (6).

When pressure gauges are installed in the

connected pipelines, you can adjust the de-

sired set point directly while monitoring the

corresponding pressure gauge.

When no pressure gauge is installed, use the

adjustment diagram to adjust the set point.

1. Undo the lock nut to allow the set point

adjuster to move freely.

2. Determine the difference between the

fixed set point (Table 1) and the required

set point. Turn the set point adjuster the

required amount of turns as specified in

Fig. 3.

Any subsequent change in set point can

be also be made by determining the re-

quired number of turns using the specifi-

cations listed in the Set point change per

turn row.

3. Secure the setting with the lock nut.

Table 1 · Set point adjustment

EB 2559 EN 7

Operation

0123456789

10 11 12

Fig. 3 · Adjustment diagram

Set point in bar

25 to 40 bar

8 to 26 bar

2 to 10 bar

Turns at the set point adjuster

Set point range 2 to 10 bar 8 to 26 bar 25 to 40 bar

Adjusted to approx. 10 bar 10 bar 25 bar

Set point change per turn 0.8 bar 1.5 bar 3.2 bar

4 Dimensions in mm

8EB 2559 EN

Dimensions in mm

126

220

313

Ø 80

M40 x 1.5

Fig. 4 · Dimensions

Ø80

Ø28M40 x 2

126

155

111

M26 x 1.5

Type 2357-3 · Standard version

Type 2357-3 · Special version (stainless steel)

Welded on site

4.1 Accessories

Table 2 · Accessories

Other accessories are listed in TV-SK 17010 EN.

EB 2559 EN 9

Accessories · Dimensions in mm

Accessories Order number

Non-return unit for port C, connection for ball-type bushing M40x2 1400-7092

2 soldering nipples for 28 mm pipe, PN 40 For port A and B 1400-7090

1 soldering nipple for 28 mm pipe, PN 40 For port C with non-return unit 1400-7300

1 soldering nipple for 18 mm pipe, PN 40 For port C without non-return unit 1400-7091

Sealing cap for port C 1400-7297

Sealing cap for port A 1400-9527

3 welding ends for 18 x 1.6 mm pipe

(1.4404) with (brass) coupling nut For port A, B and C with non-return

unit 1400-9742

10 EB 2559 EN

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