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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve

Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve
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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve - 1

T 2557 EN Type 2357-1 Pressure Regulator · Types 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: valve opens when the upstream pressure drops Type 2357-1 · Pressure reducing valve: valve closes when the downstream pressure rises Type 2357-2 · Excess pressure valve: valve opens when the upstream pressure rises Industrial gases (such as argon, nitrogen and oxygen) are stored 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) require the use of 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 other operating conditions. 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 regulators consist of a valve body with two ports (marked A and B), internal operating diaphragm and set point adjuster. –– Types 2357-1 Pressure Build-up Regulators with safety function · 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. 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. The valve opens to equalize the pressures. –– Types 2357-1 Pressure Reducing Valve (globe 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. Fig. 1: Type 2357-1 Pressure Fig. 2: Type 2357-2 Pressure Regulator (pressure Regulator (excess build-up regulator or pressure valve) pressure reducing valve) –– Types 2357-2 Excess Pressure Valve (angle 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. Type 2357-2 can be optionally equipped with a non-return unit. In thermally insulated tanks, the excess pressure is relieved by feeding the gas into the consumer pipeline. Accessories –– Types 2357-1/-2: mounting parts - soldering nipple with ball-type bushing (for connection to 16 or 15 mm pipe diameter); filter with 270 or 50 μm mesh –– Type 2357-2: non-return unit Further accessories in Data Sheet u T 2570. SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 ·

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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve - 2

 Pressure reducing valve  Pressure build-up regulator Functioning as a pressure build-up regulator with direction of flow 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. The pressure build-up regulator operates as a safety valve and relieves the pressure chamber of pressure when the pressure exceeds the set point by 5 bar. After overcoming the spring force of the top springs (16), the valve opens to equalize the pressures. The...

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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve - 3

Sample application (schematic drawing) 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 2357-1 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 operating pressure again. The pressure build-up regulator...

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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve - 4

Table 1: Type 2357-... · Valve versions and end connections Type Pressure build-up regulator/pressure reducing valve Globe valve Excess pressure valve Angle valve Output G ¾ A Conical joint G ¾ Female thread Table 2: Technical data · All pressures in bar (gauge) Type Nominal pressure Safety function for Types 2357-1 Max. perm. differential pressure ∆p Types 2357-1 Pressure Reducing Valves: Gases 30 bar · Liquids 6 bar Types 2357-2 Excess Pressure Valve: 3 bar (> 3 bar only with special accessories) Further set point ranges on request Table 3: Materials · Material numbers according to DIN...

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Type 2357-1 Pressure Regulator · Types 2357-2 Excess Pressure Valve - 5

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 2357-1 Pressure Build-up Regulator installed in the liquid phase of the pressure build-up control loop; as shown in Fig. 5 (sample 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 are...

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