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Cryogenic safety relief valves are fashioned to be used with cryogenic and industrial gas equipments. It is appropriate for temperatures from -423 to 4000 and for pressures 400 psig. Included in its applications are dual safety relief systems , stationery cryogenic storage tanks, pipelines, air & gas compressors for overpressure relief of tanks and also pumps.

General Conditions for Valves Selection

Irrespective of the valve type; whether cryogenic safety valves , ball valves, globe valves etc, there are conditions that guide the choice of valves. For instance , if you are looking for a valve that will be used in severe service reliably; you need to think about getting a valve that has received the applicable approval or certification for that specific service. Such valve must also meet the present industry standard or codes. As an example, Valves utilized in fire safety applications have a specification - API 607.

You also need to have an insight into the valve design features that are necessary for performance. Understanding the fact that valve makers can control design features that influence the valve?s performance is important; though they do not have control over your system?s design parameters. One of these features that are critical is the manner a valve seals to atmosphere. You can either have a packed or packless valve. Packed valves are associated with live-loaded or conventional packing. Conventional packed valves allow a closely fitting of the PTFE packing cylinder around the valve stem. At the tightening of the packing nut, a seal is formed as the PTFE is forced outward against the valve bonnet and inward alongside the stem.

A live-loaded seal is another design for packed valves; it subjects the packing to constant compression which makes sure that it stays leak-tight. This is also true for systems with constant pressure or changes in temperature or high circle rates. To realize seal devoid of increase in the amount of torque needed for valve actuation , loaded packing put forth a minimum amount of pressure; wear and tear is also minimized on the stem packing in high cycle applications by live loading. Live loading is known with 2 commonest methods which are ?a spring-loaded plastic packing and O-ring seal.

Packless valves make static metal to metal seal available. Also, the integrity of metal to metal seal can be affected by many factors within the control of the valve manufacturer. An instance is the case of the direct relationship that exists between the surface finish quality and valve performanceseal integrity. The differential hardness of the materials can also exert effect on metal to metal seal integrity. For the seat to deform a bit and create a leak-tight seal, the tip of the stem must compose of a harder material in comparison with the seat.

There?s more to learn about selecting Cryogenic safety valves and other valves. An important factor that must be mentioned also is the issue of ensuring that the industry standard or codes for a valve?s application is ascertained.

Author's Resource Box

Herose Ltd is author of this article on globe valves.
Find more information about ball valves here.

Article Source:

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