DATA SHEETT 2557 EN
Type 2357-1 Pressure Regulator · Type 2357-2 Excess Pressure Valve
Self-operated Pressure Regulators for special applications

Application
Pressure regulators for cryogenic gases as well as other liquids, gases and vapors · Operating pressures up to 50 bar · Set point
ranges from 0.2 to 40 bar · Temperatures from –196 to +200 °C · Oxygen clean according to international standards and guidelines
Type 2357-1 · Pressure build-up regulator: the valve opens when the upstream pressure drops
Type 2357-1 · Pressure reducing valve: the valve closes when the downstream pressure rises
Type 2357-2 · Excess pressure valve: the valve opens when the upstream pressure rises
Industrial gases (such as argon, nitrogen and oxygen) arestored in a liquefied condition at extremely low temperatures
and at a constant pressure in thermally insulated tanks. Pipes
transport the medium to the consumer. The extreme operating
conditions (pressures up to 50 bar and temperatures down to –196 °C) make it necessary to use special valves.
The Series 2357 Pressure Regulators are especially designed
for the conditions in cryogenic service. These regulators
can also be used for gases, liquids and vapors under otheroperating conditions.

Pressure reduction function–

Type 2357-1 Pressure Build-up Regulator with safetyfunction
The upstream pressure is transmitted to the operating
diaphragm. The valve opens when the upstream pressure
drops. Direction of flow from port B to port A.

–

Type 2357-1 Pressure Reducing Valve with safety function
Pressure regulator (globe valve). The valve regulates thedownstream pressure to the adjusted set point. The valve
closes when the downstream pressure rises. Direction offlow from port A to port B.

–Safety function of Type 2357-1
The plug in the pressure build-up regulator or pressure
reducing valve relieves the pressure chamber at port B.
The pressure acts from below against the plug surface. Thevalve opens to equalize the pressures.

Special features• Low-maintenance proportional regulators requiring noauxiliary energy• Wide set point range and convenient set point adjustment• Rugged design and low overall height• Cleaned and packed for oxygen service

Pressure relief function–Type 2357-2 Excess Pressure Valve
Pressure regulator (angle valve). The valve regulates theupstream pressure to the set point adjusted at the set pointadjuster. The valve opens when the pressure increases until
the set point is reached.
Type 2357-2 can optionally be equipped with a non-return
unit. In thermally insulated tanks, the excess pressure isrelieved by feeding the gas into the consumer pipeline.

Accessories
For Type 2357-1–Fig. 1: Type 2357-1 Pressure
Regulator (pressure build-up
regulator or pressure reducingvalve)

Solder nipple with ball-type bushing (for connection to 16
or 15 mm pipe diameter); filter with 270 μm mesh

For Type 2357-2
Fig. 2: Type 2357-2 PressureRegulator (excess pressure valve)

Versions–

Solder nipple with ball-type bushing (for connection to 16or 15 mm pipe diameter); filter with 270 μm mesh–

Non-return unit

Further accessories in Data Sheet T 2570.

The pressure regulators consist of a valve body with two ports(marked A and B), internal operating diaphragm and set point
adjuster.
SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

Edition May 2024

Principle of operation→ Pressure reducing valve← Pressure build-up regulator

Functioning as a pressure build-up regulator with direction offlow from port B to port A, the pressure upstream of the valve(port B) is transmitted to the operating diaphragm. The valve
closes when the upstream pressure increases and opens when
the upstream pressure drops.

4.2

16

The safety function of the pressure build-up regulator relieves
the pressure chamber of pressure when the pressure exceeds
the set point by more than 5 bar. After overcoming the springforce of the top springs (16), the valve opens to equalize thepressures.

1312.1
3AB

1717
13
4.1
5678

The process medium flows from port A to port B when theType 2357-1 Pressure Regulator is used as pressure reducingvalve.
The valve is open when no pressure is applied. The pressure
downstream of the valve (port B) is transmitted to the operating
diaphragm (3). The positioning force produced moves thevalve plug (2.1) depending on the spring force adjustable atthe set point adjuster (10). The valve closes when the pressure
downstream of the valve (port B) rises.
The safety function of the pressure reducing valve relieves
the pressure chamber of pressure when the pressure exceeds
the set point by more than 5 bar. The resulting downstreampressure is 5 bar below the upstream pressure.

971110Fig. 3: Type 2357-1 Pressure Build-up Regulator or Pressure
Reducing Valve (PN 50)
B1213

The medium always flows through the Type 2357-2 Excess
Pressure Valve from port A to port B. The valve is closed whenno pressure is applied. The pressure at port A is transmitted
internally to the operating diaphragm (3). The positioning force
produced opposes the adjustable spring force. The valve opens
when the pressure increases until the set point is reached.

A17To discharge small quantities of gas into the atmosphere, theType 2357-2 Excess Pressure Valve can be used with special
accessories. The tank's safety valve does not react when justthe gas volume must be discharged due to heat leak.

5678The excess pressure valve can additionally be equipped with anon-return unit, which prevents the medium from flowing backthrough the valve.

97Installation

11

Mounting position with the spring housing suspended
downward · Other mounting positions on request.
–

Build-up pressure regulator with safety function
Direction of flow from port B to port A–

Pressure reducing valve
Direction of flow from port A to port B–

Excess pressure valve with non-return unit
The center axis of the regulator must be vertical and port B
must point upward.

Further information is available in EB 2557.
EC type examination
An EC type examination according to the Pressure Equipment
Directive 2014/68/EC, Module B has been performed on theType 2357-1 Regulator.
Serial number

134.1

10Fig. 4: Type 2357-2 Excess Pressure Valve (PN 50)
12.1
3
4.1
4.2
56789101112131617

Valve body
Plug
Operating diaphragm
Seal (bottom section of the body)
Seal (top section of body)
Diaphragm plate
Ball
Spring plate
Set point springs
Bottom section of the body (spring housing)Set point adjuster (hex socket, A/F 5)
Lock nut (A/F 17)
Non-return unit (accessories)
FilterPlug spring
Solder nipple with ball-type bushing (accessories)

The devices are marked with a serial number on thenameplate. Details on the nameplate are available inEB 2557.

2T 2557 EN

Installation example

opening the valve (upstream pressure at port B) to equalize thepressures. The pressure chamber is relieved of pressure as aresult.

Pressure regulator functioning as a pressure build-up
regulator with safety function

Pressure regulator functioning as an excess pressure valve(economizer)

When tapping the liquefied cryogenic gas, the gas pressurein the insulated tank causes the medium to be transferred tothe vaporizer (8). The gas pressure in the tank drops below
the adjusted operating pressure. The Type 2357-1 Regulator(installed as a pressure build-up regulator; 2) opens and allows
the liquefied gas to flow into the pressure build-up vaporizer(7). The gas pressure increases and reaches the operatingpressure again. The pressure build-up regulator (2) closes.

The Type 2357-2 Excess Pressure Valve (3) is adjusted to apressure above the operating pressure. Any liquid trapped
between the shut-off valves (6.1 and 6.2) vaporizes, causing
the pressure to increase. The excess pressure valve (3) opens,allowing the gas to escape into the consumer pipeline.
Pressure regulator functioning as a pressure reducing valve
If a lower pressure is required in the draw-off pipe, theType 2357-1 Pressure Regulator can be used to function as apressure reducing valve (4).

After closing the shut-off valve (6.1), the liquid remaining
in the pipeline between shut-off valve (6.1) and regulator(2) vaporizes, causing the pressure to increase. The plug ofthe pressure build-up regulator (2) acts as safety valve by310+136.2197

13_6.1123456.1
6.2
789101112112

Cryogenic tankType 2357-1 Pressure Build-up Regulator
Type 2357-2 Excess Pressure Valve (economizer)
Type 2357-1 Pressure Reducing Valve
Type 2040 Temperature Monitor
Shut-off valve
Shut-off valve
Pressure build-up vaporizer
Final vaporizer
Media 7/Media 5 Level Meter
Safety valve
Strainer
Shut-off valve
Pressure protection by Type 2357-2 with special
accessories

8BTR
5_A412Fig. 5: Series 2357 Pressure Regulator for cryogenic service, schematic drawingT 2557 EN3

Table 1: Type 2357-... · Valve version and end connections
TypeDesignVersion

2357-1Pressure build-up
regulator/pressure
reducing valve 1)

Globe valve

2357-2

Excess pressure valve

Angle valve

End connections
Inlet1)

OutletG¾A(conical joint)

G¾A(conical joint)

G¾(female thread)

PN 50 only

Table 2: Technical data · All pressures in bar (gauge)
Type2357-1

Pressure rating

2357-2

PN 40

KVS coefficient

PN 50 2)0.25

Set point range 1) in bar

1 to 25 · 10 to 36

0.8

PN 40
1.25

0.4

0.2 to 2.5 · 1 to 8 · 5 to 25 · 8 to 40

Safety function for Type 2357-1

1 to 25 · 10 to 36

5 bar above the set point

Max. perm. differential pressure ∆p

Type 2357-1 Pressure Reducing Valve: gases 30 bar ∙ Liquids 6 bar
Type 2357-2 Excess Pressure Valve: 3 bar (>3 bar only with special accessories;
KVS reduced to 0.02)

Temperature range–196 to +200 °C

Weight, approx.

3.5 kg

Conformity1)
2)

Further set point ranges on request
For oxygen pmax = 40 bar

Table 3: Materials · Material numbers according to DIN ENType2357-12357-2

Body

CC754S-GM (brass)

CoverCC754S-GM (brass) 1)

Plug

CW602N (brass) 1) with PTFE soft seal

Operating diaphragm–CuBe

Set point springs

Stainless steel 1.4310

Body gasket1)

1)

PTFE

PN 40: CW617N (brass)

Dimensions (in mm)
150
110
51(35)

7555

Ø16/Ø15

Ø16/Ø15G¾

40 25

G¾G¾140(95)140(95)

Type 2357-1 Pressure Regulator with solder nipple (accessories) ·Weight 2.0 (0.9) kg

Type 2357-2 Pressure Regulator with solder nipple and nonreturn unit (accessories) · Weight 1.7 (0.6) kg

Specifications in parentheses () apply to regulators in PN 40

4T 2557 EN

Flow capacity of the regulator dependent on the liquidcolumn in the cryogenic tank

up control loop; as shown in Fig. 5 (Sample application). The
maximum flow capacity [kg/h] of the regulator arises from theliquid level of the medium in the tank and can be determinedfrom the graph.

The flow capacity is indicated separately in value tables andmass flow diagrams for the media nitrogen (N2), oxygen (O2),argon (Ar), carbon dioxide (CO2) and natural gas (LNG).

The data in the graph are based on theoretical calculations
which do not take factors, such as pressure losses in thepipeline, into account. Therefore, the real flow capacity may
deviate from the calculated value.

The specifications apply to the Type 2357-1 Pressure Build-up
Regulator installed in the liquid phase of the pressure build-

Table 4: Mass flow of various media dependent on the liquid column in the cryogenic tankMediumN2

O2

Ar

Filling level in m

CO2LNG

Mass flow rate in kg/h

1248351427359

130

3379

537

6535501995475

673

819

689

249

7555

785

956

805

291

9624

884

1076

906

328

11687

973

1184

996

361

14771

1093

1329

1119

405

17848

1201

1460

1230

445

20918

1300

1580

1331

482kg
h
1800
Ar

1600

Flow rate

1400

CO 2O2

1200
1100

N2800
600
LNG

400
200
00

1

2

3

4

56

78

910 11 12 13 14 15 16 17 18 19 20 [m]Filling level

Fig. 6: Mass flow dependent on the liquid column in the cryogenic tankOrdering text
Type 2357-1 Pressure Reducing Valve or Pressure Build-upRegulator
Type 2357-2 Excess Pressure ValveSet point range … bar
Optionally, accessories ...
Optionally, special version ...

T 2557 EN5

T 2557 EN

2024-05-08 | English |Specifications subject to change without notice