T 2560 EN
Type 2357-11 Pressure Regulator · Type 2357-21 Excess Pressure Valve
Self-operated Pressure Regulators

Application
Pressure regulators for cryogenic gases and liquids as well as other liquids, gases and vapors · Operating pressures up to
63 bar · Set points from 0.2 to 40 bar · Temperatures from –200 to +200 °C · Oxygen clean according to international
standards and guidelines
Pressure build-up regulator · Valve opens when the upstream pressure drops
Pressure reducing valve · Valve closes when the downstream pressure rises
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–200 °C) make it necessary to use special valves.
The Series 2357 Pressure Regulators are especially designed
for the conditions in cryogenic service. These regulators canalso be used for gases, liquids and vapors under other operating conditions.
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 1)
Versions
The pressure regulators consist of a valve body, operating
diaphragm and set point adjuster.
Type 2357-11 Pressure Build-up Regulator with safetyfunction
The upstream pressure is transmitted to the operating
diaphragm. The valve opens when the upstream pressure falls
below the adjusted set point. Direction of flow from port B toport A.
Safety function: the plug in the pressure build-up regulator
operates like a safety valve and relieves the pressure chamber.
The pressure acts from below against the plug surface. Thevalve opens to equalize the pressures.

1)

The regulators are not approved for oxygen service according toEIGA 13/02/E due to the use of thin-walled components made of CrNi
steelFig. 1: Type 2357-11 Pressure Regulator/Type 2357-21 Excess
Pressure Valve

Type 2357-11 Pressure Reducing Valve
The valve regulates the downstream pressure to the adjusted
set point. The valve closes when the downstream pressure rises. Direction of flow from port A to port B.
Type 2357-21 Excess Pressure Valve
The valve regulates the upstream pressure to the set point adjusted at the set point adjuster. The valve opens when the pressure increases until the set point is reached. Direction of flowfrom port B to port A.
The valve opens when the pressure increases until the set pointis reached. The regulator is additionally equipped with an
integrated non-return unit that prevents the medium fromflowing back.

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

Special versions (details on request) Pressure reducing valve
 Pressure build-up regulator

Type 2357-11 and Type 2357-21 Pressure Regulators–Version for flammable gases

Accessories
Coupling nut and ball-type bushing with welding nipple for21.3x1.6 mm pipe diameter · Coupling nut and ball-typebushing with flanges · Other accessories in Data Sheetu T 2570.
Principle of operation

1612.1AB

4.1

15
53

6
7

Ports A and B are marked on the valve body.
Functioning as Type 2357-11 Pressure Build-up Regulator(Fig. 2)
Direction of flow from port B to port A, the pressure upstreamof 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.

8The pressure build-up regulator operates as a safety valve andrelieves the pressure chamber of pressure when the pressure
exceeds the set point. The resulting downstream pressure is5 bar below the upstream pressure.

11The 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 valve (port B) increases.
The medium flows through the Type 2357-21 Excess Pressure
Valve (Fig. 3) from port B to port A. The valve is closed whenno pressure is applied. The pressure at port B 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 isreached. The integrated non-return unit prevents the medium
from flowing back.

7910Fig. 2: Type 2357-11 Pressure Build-up Regulator or Pressure
Reducing Valve Direction of flow
121

B

A

4.1

14
5

3

6
7
8

Installation
Type 2357-11 Pressure Build-up Regulator (pressure reducing valve)

7–Standard mounting position with the spring housing suspended downward. Other mounting positions on request.

11–

Build-up pressure regulator: direction of flow from port B
to port A–

Pressure reducing valve: direction of flow from port A toport B

Type 2357-21 Excess Pressure Valve with non-return unit–

Installation in horizontal pipelines–

Direction of flow from port B to port A–Spring housing points downward

EC type examination

910Fig. 3: Type 2357-21 Excess Pressure Valve

1 Valve body
2.1 Plug
3 Operating diaphragm4.1 Seal
5 Diaphragm plate
6 Ball
7 Spring plate
8 Set point springs

9101112141516

Bottom section of the bodySet point adjuster
Lock nut
Integrated non-return unit
Housing screws
SeatPlug spring

An EC type examination according to the Pressure Equipment
Directive 2014/68/EU, Module B has been performed on theType 2357-11 Regulator.

2T 2560 EN

Pressure regulator functioning as an excess pressure valve

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

The Type 2357-21 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.

When tapping the liquefied cryogenic gas, the gas pressure in
the insulated tank causes the medium to be transferred to thevaporizer (8). The gas pressure in the tank drops below theadjusted operating pressure. The Type 2357-11 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.

Pressure regulator functioning as a pressure reducing valve
If a lower pressure is required in the draw-off pipe, theType 2357-11 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 of thepressure build-up regulator (2) acts as safety valve by opening
the valve (upstream pressure at port B) to equalize the pressures. The pressure chamber is relieved of pressure as a result.

Sample application
10313+6.2

Cryogenic tank

2Type 2357-11 Pressure Build-up Regulator

3Type 2357-21 Excess Pressure Valve

4

Type 2357-11 Pressure Reducing Valve

5

Type 2040 Temperature Monitor

6.1 Shut-off valve

1

6.2 Shut-off valve

97

81

6.1

_11TR
5_A

8Final vaporizer

9Media 7/Media 5 Level Meter

10 Safety valve
11 Strainer

13A
4Pressure build-up vaporizer

12 Shut-off valve

2B

7Pressure protection by Type 2357-21
with special accessories

12BFig. 4: Series 2357 Pressure Regulator for cryogenic service, schematic drawing

T 2560 EN3Table 1: Technical data · All pressures in bar (gauge)
Type2357-11

KVS coefficient

2357-210.8

1.25

Set point ranges 1) in bar

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

Permissible operating pressure

63 bar 2)

Conformity·Safety function for Type 2357-11

5 bar above the set point

Max. perm. differential pressure ∆p

Type 2357-11 Pressure Reducing Valve: Gases 30 bar ∙ Liquids 6 bar
Type 2357-21 Excess Pressure Valve: 3 bar (> 3 bar only with special accessories; KVS reduced to 0.02)

Temperature range1)2)–200 to +200 °C

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

Table 2: Materials · Material numbers according to DIN ENType

2357-112357-21Body

1.4404

Spring housing

1.4404

Plug1.4404

Operating diaphragm

CuBe with composite diaphragms made of 1.4310

Set point springs

Stainless steel (1.4310)

Body gasket

PTFE

Dimensions in mm and weights
14010035G¾A

155

Type 2357-11 Pressure Regulator/Type 2357-21 Excess Pressure Valve with welding ends (accessories) · Weight approx. 4 kg
Fig. 5: Dimensions and weights

4T 2560 EN

Flow capacity of the regulator dependent on the liquid column in the cryogenic tank

The maximum flow capacity [kg/h] of the regulator arises fromthe liquid level of the medium in the tank and can be determined from the graph.

The value table and the mass flow diagram show theflow capacity 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 calculationswhich do not take factors, such as pressure losses in the pipeline, into account. Therefore, the real flow capacity may deviate from the calculated value.

The specifications apply to the Type 2357-11 Pressure
Build-up Regulator installed in the liquid phase of thepressure build-up control loop; as shown in Fig. 4(sample application).

Table 3: Mass flow dependent on the liquid column in the cryogenic tank
Mass flow rate [kg/h]

Filling level [m]

N2

O2

Ar

CO2LNG

1248

351

427

359

130

3379

537

653

550

199

5475

673

819

689

2497555

785

956

805

291

9624

884

1,076

906

328

11687

973

1,184

996

361

14

771

1,093

1,329

1,119

405

17

848

1,201

1,460

1,230

445

20

918

1,300

1,580

1,331

482kg
h1800
Ar

1600

Flow rate

1400

CO 2
O21200
1100

N2800
600
LNG

400
200
0

0

1

2

3

4

5

6

7

8

9

10

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 2357-11 and Type 2357-21 Pressure Regulators
Set point range … bar
Optionally, accessories ...
Special version ...

T 2560 EN

5

T 2560 EN

2024-05-08 · English

Specifications subject to change without notice