Emerson DeltaV 1C31222G01

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Emerson  DeltaV 1C31222G01 Power module In Stock

These liquid trim relief valves also have a blowdown ring. The ring helps 

to provide the upward reactive force to assist opening, however the 

position of the ring is not used to determine when the valve will reseat. 

These relief valves have a fixed blowdown that will allow the device to 

reclose at approximately 10% to 15% below set pressure.

Prior to 1985, the ASMe Section VIII code did not require certified 

liquid capacities at 10% overpressure. Many manufacturers provided 

PRVs with trim designs similar to that shown in figure 4-6 for use in 

incompressible medias. This trim design often required up to 25% 

overpressure for the valve to obtain full lift because the lower reactive 

forces generated by the frim design. It was also noted that the loss of 

liquid velocity during opening might cause an undesirable fluttering or 

oscillating action.

There may be installations where the service fluid may be either 

compressible, incompressible or a combination of phases when the 

pressure relief valve is called upon to operate. for instance, there may 

be multiple overpressure contingencies to consider for a pressure relief 

valve where the valve may see liquid in one case and a gas in another. 

Another example is that there might also be a fluid that can be in a liquid 

state under pressure and while it is relieving, the fluid may transition to 

some quality of vapor causing a multi-phase relieving state.

There are direct acting valves available that have been certified to 

meet ASMe Section VIII requirements for gas or liquid. This is normally 

accomplished using the liquid trim design (figure 4-11) which will 

provide an adequate huddling chamber to obtain rated capacity by 10% 

overpressure on vapor service. This trim geometry will provide a stable 

lifting characteristic on gas or liquid or mixed phase fluids. One item to 

not

Product details:

Emerson  DeltaV 1C31222G01 Power module

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