Low-temperature cryogenic Industrial Valves design and type selection of

when regulating valve operating temperatures far below freezing point, specific prevention measures should be taken, in some cases, must use special structure to meet the operation requirements. The main problem is the choice of appropriate structure materials, especially in the low temperature operating conditions ( To - 101℃） 。 Cryogenic refers to the temperature below - The operation of 101 ℃, want to consider a number of additional factors.

temperature range in - 29℃- Between 101 ℃ and the parts under pressure to adopt the special shock resistance of carbon steel, in - 29℃- 46 ℃, generally take LCB carbon steel material, to - 101 ℃, will use the 3. 5% nickel steel, these valves are usually equipped with ordinary long neck type on the cover, in this temperature range, the main purpose is to make the heat into the system to reduce as far as possible, and prevent the stuffing box part on not too cold and make the upper portion of the valve cover and stuffing box on the stem to freeze. General long neck type bonnet generally in a vertical position, to reduce the operation of the heat transfer fluid itself.

at cryogenic temperature, do not use carbon steel structure material now, instead of austenitic stainless steel, bronze, monel alloy. In this temperature range, the operation of the regulating valve is generally control of cold gas and liquefied petroleum gas, often encounter are: air, nitrogen, oxygen, hydrogen and helium.

now pay special attention to the structure of the valve cover long neck type. Even when the valve body material is bronze, the long neck type bonnet generally adopts austenitic stainless steel in order to reduce heat transfer, be very careful: liquefied petroleum gas can't all gathered in the valve cover, because the closing of vaporization is in danger of forming high pressure.

is for all the cases, the regulator to strictly adiabatic. Low temperature in the factory area of process equipment piping and valves used in cold box. In this case, the regulator has a special long on the cover, it can be installed in a horizontal position. Diameter larger portion of the cover made of stainless steel, and sticking out from the cold box wall layer. Such, does not involve the body can unload including trims valve core and valve seat, the valve can be welded on the system in order to reduce the leakage of the cold box itself.

general, cryogenic valve, when processing, especially in the assembly, the more strict of cleanliness.

note that when choosing lubricant in assembly parts when it can be used to prevent wear and tear, there are a lot of lubricant can cure or brittle, but there are many completely does not apply to the flow of fluid. To this end, has developed many compounds for the occasion, and has set up a extensive use. There are many matters need to pay special attention to, for example, when adjusting the liquid fluorine, it and any hydrocarbons contact spontaneous combustion; Control of oxygen, both room temperature and cryogenic, a more general problem, in addition to contact with the possibility of spontaneous combustion and some impurities, oxygen can also fuel, if in the event of fire, will burn the whole pipeline system, most of the valves to skim the cryogenic regulator requires.

keywords: low-temperature cryogenic valve design and type selection, structure of the valve material, Industrial Valves body material
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