Cash Cryogenic Valves and Regulators

Cryogenic valves and regulators to protect liquid gas applications in cryogenic systems from Cash.

The Cryogenic System

Pressure Build Circuit:
A dewar stores liquefied gas at cryogenic temperatures. Heating this liquid in the pressure build coil changes its state to gas; this gas is fed to the top of the dewar which pressurises the system. The pressure is used to deliver the liquefied gas to the vaporizer and hence the final “house” supply line.

Safety Relief System:
If the pressure build circuit becomes uncontrolled, the pressure will continue to rise to unacceptable levels. Therefore the dewar needs protection from over pressurisation by either a safety relief valve, bursting disc, or a combination of the two.

Economiser Circuit:
There will be times when there is no demand on the dewar, and while it is very well insulated, it will still absorb some temperature from the atmosphere – particularly on hot days. This heat absorption will tend to convert the liquid to gas and thus pressurise the system. The system is protected by the safety relief system but typically the safety relief system will release the gas to atmosphere, where it is lost. The economiser system will convert the gas back to liquid at pressures below the set pressure of the safety system, thus preventing loss of product to the atmosphere.

Final “House” Supply Line:
This part of the system warms the liquid to convert it back to a gaseous state ready for final usage. There are times when it is critical that the cold liquid does not enter the final house line. Such an instance is the supply of oxygen to patients in a hospital. Under such circumstances a low temperature cut off valve is required.

Pressure Build Economiser:
Cash has developed a range of combination valves, which combine the functions of the back pressure regulator and the economiser valve. These valves can simplify the layout of the system, reduce the amount of pipe work, and the number of valves required.