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Type 2357-31 Pressure Build-up Regulator

Type 2357-31 Pressure Build-up Regulator
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Type 2357-31 Pressure Build-up Regulator - 1

Self-operated Pressure Regulators for special applications Type 2357-31 Pressure Build-up Regulator with safety function and integrated excess pressure valve Application Pressure regulators for cryogenic gases and liquids as well as other liquids, gases and vapors · Operating pressures up to 50 bar · Set point ranges from 1 to 40 bar · Temperatures from –196 to +200 °C · Oxygen clean according to international standards and guidelines Industrial gases (such as argon, nitrogen and oxygen) are stored in a liquefied condition in thermally insulated tanks at extremely low temperatures and at a constant pressure, even when the tapped amount fluctuates. Pipes transport the medium to the consumer. The extreme operating conditions (pressures up to 50 bar and temperatures down to –196 °C) require the use of special valves. The Type 2357-31 Pressure Regulator is especially designed for the conditions in cryogenic service. Special features •• Low-maintenance proportional regulators requiring no auxiliary energy •• Wide set point range and convenient set point adjustment •• Rugged design and low overall height •• Cleaned and packed for oxygen service Versions The pressure regulator consists of a valve body with three ports (marked A, B and C), internal operating diaphragm and set point adjuster. Pressure build-up regulator with safety functionDirection of flow from port A to port B (closing) The pressure at port B is transmitted to the operating diaphragm. When the downstream pressure rises, the pressure build-up plug closes the valve. Safety function: the tubular plug in the pressure build-up regulator operates like a safety valve and relieves the pressure chamber at port A when the pressure exceeds the set point by 5 bar. The difference in pressure at the balancing bellows between the inside pressure at port C and outside pressure at port A creates a positioning force. This force opens the plug to equalize the pressures and the pressure chamber upstream of port A is relieved of pressure. Excess pressure valve Direction of flow from port B to port C (opening) When no pressure is applied, the passage from port B to C is closed. The tubular plug does not open until the pressure becomes 0.5 bar higher than the set point (pressure build-up). Type 2357-31 with non-return unit · Connection with soldering nipple and ball-type bushing (ports A and B) Fig. 1: Type 2357-31 Pressure Build-up Regulator Accessories Ports A and B: soldering nipple with ball-type bushing (for 28 mm pipe diameter) Port C: soldering nipple with ball-type bushing (for 18 mm pipe diameter, without non-return unit) Non-return unit: soldering nipple with ball-type bushing (for 28 mm pipe diameter) to mount on the non-return unit. Further accessories in Data Sheet u T 2570 EN. Port C can be additionally equipped with a non-return unit. Associated Information Sheet

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Type 2357-31 Pressure Build-up Regulator - 2

Depending on the direction of flow, the regulator functions as a pressure build-up regulator with safety function (A  B) or as an excess pressure valve (B  C). The position of the pressure build-up plug (2.1) determines the flow rate across the area released between the plug and seat. The pressure regulator is designed to keep the pressure constant to an adjusted set point, especially in cryogenic plants. The regulators consists of a valve with three ports (A, B, C), spring-loaded operating diaphragm (3) with set point adjuster (6) and pressure build-up plug (2). Pressure build-up...

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Type 2357-31 Pressure Build-up Regulator - 3

To consumer, filling station etc Fig. 3: Series 2357 Pressure Build-up Regulator with safety function for cryogenic service Pressure regulator functioning as a pressure build-up regulator with safety function When tapping the liquefied cryogenic gas, the gas pressure in the insulated tank causes the medium to be transferred to the vaporizer (8). The gas pressure in the tank drops below the adjusted operating pressure. The Type 2357-31 Build-up Pressure Regulator (2) opens and allows the liquefied gas to flow into the pressure build-up vaporizer (7). The gas pressure increases and reaches...

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Type 2357-31 Pressure Build-up Regulator - 4

Flow capacity of the regulator dependent on the liquid column in the cryogenic tank The value table and the mass flow diagram show the flow capacity for the media nitrogen (N2), oxygen (O2), argon (Ar), carbon dioxide (CO2) and natural gas (LNG). The specifications apply to the Type 2357-31 Pressure Build-up Regulator installed in the liquid phase of the pressure build-up control loop; as shown in Fig. 3 (typical application). The maximum flow capacity [kg/h] of the regulator arises from the liquid level of the medium in the tank and can be determined from the graph. The data in the graph...

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Type 2357-31 Pressure Build-up Regulator - 5

Type 2357-31 · Version with soldering nipple (accessories) and non-return unit (accessories) All dimensions in mm Ordering text Type 2357-31 Pressure Build-up Regulator Set point range ... bar Optionally, accessories ... Optionally, special version ...

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Type 2357-31 Pressure Build-up Regulator - 6

SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 samson@samson.de · www.samson.de Specifications subject to change without

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