3 replies to this topic

[mahnaya]

Dear All.

What would be the basis of self regulating pressure valve selection? Can we select Self regulating rather than Control valve? Does this base only at fixed downstream pressure?

[ankur2061]

Hi,

I have used self regulating PCVs and I have never liked them. They have always given me trouble with the drift observed from the setpoint. This is particularly true if there is a shift in the upstream pressure from what was specified in the self regulating PCV specification. Self regulating PCVs are designed to work for a very narrow range of delta P and unless your application does not provide you a very steady upstream pressure as specified in the specification you are likely to get fluctuations in your downstream pressure. For critical pressure control applications I certainly would not consider them. The use of self regulating PCVs is restricted to non-critical applications and where precise pressure control is not mandated.

Hope this experience helps.

Regards,
Ankur.

[marthin_was]

I agree with Ankur.

A self regulating valve will create headaches if not used in appropriate conditions. This is due to it having a very narrow pressure inlet - as well as a delta pressure - range. But you may use it for an operation that does not require a very precise pressure setting / flow rate setting.

Marthin

[mahnaya]

Thank you so much. I am clear now.