We need to isolate and control the pressure of 1500 psig saturated steam supplied to sootblowers in a boiler. Up stream is 1500 psig, saturated with downstream controlled at approximately 380 psig, no desuperheating. Present arrangement is a fully open/close automatic isolating valve with a pressure control valve just downstream. We have poor experience with the isolating valve leaking after a couple of months. What suggestions do you have for a tight shutoff isolating valve that opens with 1500 psig upstream and atmospheric p[ressure downstream? I once worked for a valve company that made a balanced valve that shut off very tightly. We sold some for sootblowers, but did not police that the customer trapped the line properly. A sonic slug of condensate does verrrrry bad things to a control valve, and the balancing mechanism cannot cope with transient conditions such as that. There were a lot of omega-shaped buckled valve stems related with that phenomenon.

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