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I don't have a copy of your piping schematic, but is the ESD valve downstream of a check valve? Could be the high pressure is trapped them.

terje61, Our application can only use system water pressure acting through hydraulic pilots. This is exactly how water utilities control globe valves for water pressure reduction. No electrical. No pneumatics. No stored energy of any kind. - jawilke

abscott, I already considered REXA but as I wrote in my introductory problem statement, if the electrical power fails, the REXA would stop working until poer is restored and my system could be over or under pressured in big hurry.

Subject: Pressure Reducing Ball Valve with Hydraulic Cylinder Actuator. Industry: Potable fresh water at 100 psig upstream to 40-50 psig downstream. Looking for: Hydraulic Cylinder actuation pilot schematic. Background: Existing valve is a 12" throttling full port Ball Valve in a municipal...

Have you looked at G.H. Bettis? I installed a gas over oil actuation system on potable water reservoir outlets. No problems yet in 15 years.

Oh and two more things: In the post above, I mention to check the effect on your pumps. A higher Cv valve will drop the discharge pressure at your pumps and increase flow. This may run out on the pump curve to the point where the PUMP starts cavitating and some kinds of pumps (vertical...

If this is a domestic water supply, and the water only travels one way - into the reservoir - try looking into CLA-Val (USA) or Singer (Canada) globe style valves. They are made for the water works industry. The CLA Val 600 series valve is designed for anti cavitation applications. It would be...

I know this is quite late compared to the timing of the other replies, but I just have to add that I purchased Bentley Systems / Haestad Methods HAMMER transient software this Spring (2005). I have run many iterations of both complex and simple water hammer models and have found the program to...