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
4
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.
4
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.
4
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.
4
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
10
81
2
3
7
6
5
4
3
9
9
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)
C
B
A
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
40
35
30
25
20
15
10
5
0
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
63
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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