Samson 2357-1 Service manual

Self-operated Pressure Regulators
Pressure Reducing Valve Type 2357-1/-6
Excess Pressure Valve Type 2357-2/-7
Edition April 2011
Mounting and
Operating Instructions
EB 2557 EN
Type 2357-1 Pressure
Reducing Valve
Type 2357-6 Pressure
Reducing Valve
Type 2357-2 Excess
Pressure Valve

Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . . . . 3
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Shut-off valve and pressure gauge . . . . . . . . . . . . . . . . . . . . . . 5
3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Set point adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Changing the set point range. . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Dimensions in mm and weights . . . . . . . . . . . . . . . . . . . . . . . 9
2EB 2557 EN
Contents
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.
4
The declaration of conformity issued for a valve bearing the CE marking
includes information on the applied conformity assessment procedure and
will be provided on request.

1 Design and principle of
operation
The pressure regulators maintain the pressure
at an adjusted set point and are particularly
suitable for cryogenic applications.
Type 2357-1 and Type 2357-6 Regulators
(globe valves)
The regulators act as pressure reducing
valves when the medium flows from port A to
port B. When no pressure is applied, the
valve is open.
The pressure downstream of the valve B is
transmitted to the operating diaphragm (3).
The resulting positioning force moves the
valve plug (2) in relation to the spring force,
which can be adjusted at the set point ad-
juster (10). The valve closes as the pressure
downstream of the valve B increases.
When the regulators are used as pressure
build-up regulators, the medium flows from
port B to port A. The pressure upstream of the
valve (B) is transmitted to the operating dia-
phragm (3). The valve closes as the pressure
upstream of the valve increases and opens as
the upstream pressure drops.
The pressure build-up regulator additionally
assumes the function of a safety valve,
depressurizing the pressurized valve when
the set point is exceeded by more than 5 bar.
When the pressure has overcome the force of
the springs located on top, the valve opens to
balance the pressures.
Type 2357-2 and Type 2357-7 Regulators
(angle valves)
The regulators functioning as excess pressure
valves, the medium always flows from port A
to port B. When no pressure is applied, the
valve is closed. The pressure at port A acts on
the operating diaphragm (3) in the valve
body. The resulting force opposes the adjust-
able spring force. As the pressure increases,
the valve opens until the set point is reached.
Regulators functioning as excess pressure
valves can optionally be equipped with a
non-return unit (12) which prevents the me-
dium from flowing back.
EC type examination
An EC type examination according to the
Pressure Equipment Directive 97/23/EC,
Module B has been performed on the regula-
tor versions for PN 50.
EB 2557 EN 3
Design and principle of operation

4EB 2557 EN
Design and principle of operation
1
2
3
13
4
5
6
8
11
7
13 13
9
10
12
1
3
4
5
6
7
8
9
11
10
AA
B
B
Fig. 1 · Sectional drawings of Type 2357-1/-6 (left) and Type 2357-2/-7 (right)
7 Spring plate
8 Set point spring(s)
9 Lower section of body
10 Set point adjuster
11 Lock nut
12 Non-return unit
13 Strainer
1 Body
2 Plug
3 Operating diaphragm
4 Gasket
5 Diaphragm plate
6 Ball

2 Installation
2.1 Mounting position
The pressure regulator must be in-
stalled with the actuator housing
hanging downward.
Observe the following directions of flow:
4Ato Bin pressure reducing valves
4Bto Ain pressure build-up regulators
with safety function
4Ato Bin excess pressure valves
equipped with a non-return unit. Port B
must point upward.
The ports are marked.
Note: Make sure that any impurities carried
along by the process medium in the con-
nected pipelines do not impair the proper
functioning and especially the tight shut-off of
the regulator.
2.2 Shut-off valve and pressure
gauge
We recommend installing a hand-operated
shut-off valve both upstream and downstream
of the regulator to be able to shut down the
plant for cleaning and maintenance, and
when the plant is not used for longer periods
of time.
Install a pressure gauge both upstream and
downstream of the regulator to monitor the
pressures prevailing in the plant.
EB 2557 EN 5
Installation
11232
Fig. 2 · Typical installation
1 Shut-off valve
2 Pressure gauge
3 Pressure regulator

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 (10).
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.
To increase the set point, turn the set point ad-
juster into the body, and to decrease the set
point, turn the set point adjuster out of the
body.
1. Undo the lock nut to allow the set point
adjuster to move freely.
2. Determine the difference between the
fixed set point (table below) and the re-
quired set point. Turn the set point ad-
juster the required amount of turns as
specified in the diagram.
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 table in “Set point
change per turn”.
3. Secure the setting with the lock nut.
6EB 2557 EN
Set point adjustment
Nominal pressure PN 40 PN 50
Set point range in bar 0.2 to 3 1 to 25 10 to 36 0.2 to 2.5 1 to 8 5 to 25 8 to 40
Set point
adjusted at the
factory to
approx. … bar
2357-1 1 12 20 1 3 12 25
2357-2 1 13 21 1 4 13 26
Set point change per turn
in bar 0.4 2.5 3.5 0.4 1 2.5 3.5
Table 1 · Set point adjustment
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
0
5
10
15
20
25
30
35
40
1 to 25 1 to 8
5 to 25
8 to 40
10 to 36
Fig. 3 · Adjustment diagram
Turns of the set point adjuster
Set point/Set point range in bar

3.2 Changing the set point range
The set point ranges adjusted by the manufac-
turer can be changed subsequently by ex-
changing the set point springs (8) and the op-
erating diaphragms (3).
In case of doubt, we recommend you to let
SAMSON perform this work for you.
The addresses of SAMSON AG, its subsidiar-
ies, representatives and service facilities
worldwide can be found on the Internet at
www.samson.de, in a SAMSON product cat-
alog or on the back of these mounting and
operating instructions.
CAUTION!
Always remove the regulator from the pipe
when performing any assembly work. Prior to
removing the regulator, relieve the pressure
as well as thaw and drain the corresponding
section of the plant.
1. Unscrew the lock nut (11). Completely re-
lieve the set point springs (8) of tension by
turning the set point adjuster (10) in a
counterclockwise direction.
2. Place the lower section of the body (9)
into a vise, but do not clamp it. Better: use
a box wrench with width across flats =
55 mm. Unscrew the body (1) using an
open-end wrench with width across flats
= 36 mm and remove all parts from the
lower section of the body. Be careful not
to damage the operating diaphragms
(3).
3. Install set point spring(s) for the required
set point range, the spring plates (7), the
ball (6) and the diaphragm plate (5) in
the lower section of the body.
4. Place the required number of dia-
phragms (see table of spare parts) onto
the diaphragm plate and replace the
PTFE gasket (4) of the valve body, if re-
quired.
5. Carefully place the body onto the lower
section of the body. Then screw the body
onto the lower section of the body using a
tightening torque of approx. 180 Nm for
PN 40 and approx. 250 Nm for PN 50.
EB 2557 EN 7
Operation

Note: Accessories and spare parts with order
numbers 1400-xxxxx are always delivered
"free from oil and grease for oxygen service."
8EB 2557 EN
Spare parts
Spare parts list Order no.
Pos. Spare part
PN 40 PN 50
Set point range in bar
1 to 25 10 to 36 1 to 8 5 to 25 8 to 40
3Number of diaphragms 33357
Set of accessories:
with 20 diaphragms
with 50 diaphragms 1400-7626
1400-7627 1400-7623 1400-7624
4Seals, set of accessories:
with 20 seals
with 50 seals 1400-7630
1400-7631 1400-7628 1400-7629
8Set point springs 1400-9747
1400-9747 1 to 25 bar 10 to 36 bar
1400-9383 1 to 8 bar
1400-7640 5 to 25 bar
1400-7305 8 to 40 bar
12 Non-return unit
for Type 2357-2 1400-5129 (15 mm) or 1400-5139 (16 mm)
13 Strainer 1400-5136 (270 x 10-6 m mesh size) or
1400-5126 (50 x 10-6 m mesh size)
Connecting parts:
Soldering nipple with
connection nut
1400-5133 (1 x Æ15)
1400-5134 (2 x Æ15)
1400-5138 (1 x Æ16)
1400-5137 (2 x Æ16)
Table 2 · Spare parts list with order numbers

4 Dimensions in mm and weights
EB 2557 EN 9
Dimensions in mm and weights
150
110
51(35)
140 (95)
Ø16
G/
34
40
140
Ø15
60
140
118
Ø15
G/
34
G/
34
55
75
60
140 (95)
Ø16
25
40
Ø15
Fig. 4 · Dimensions
Type 2357-7
Weight approx. 2.5 kg
Values in parentheses for PN 40 version
Type 2357-6
Weight approx. 3.0 kg
Type 2357-1
Weight approx. 2.0 (0.9) kg Type 2357-2
Weight approx. 1.7 (0.8) kg

10 EB 2557 EN

EB 2557 EN 11

SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt · Germany
Phone: [phone] · Fax: [phone]
Internet: http://www.samson.de EB 2557 EN
S/Z 2011-04