A valve that doesn't change the volume of the system on activation (i.e. which prevents hydraulic shock), can be operated remotely and has short activation time I'd use ball valves but their pressure/temperature charts are unsuitable also i've heard of some kind of piston valve there the stem is located in the middle of piston IMHO, selection of a valve depends on basically 8 parameter (there's more of course, but these could apply on the majority kind of valves): Type. 2,3 or 4 ways Operation: NC, NO, universal, on/off service, modulating service, etc. Medium: Oil?, water?, gas? other? Size. (Diameter connetion type) Presure(maximum, minnimum, normal or differential) Atmosphere (explosive, general purpose, corrosive, etc) V: Voltage, in case you are using solenoid valves or motorized valves Extra: Temperature, vibration, special materials, etc. As large as I can see (you must have to include more information!!), maybe you are looking for a 2ways/2position, normally closed valve. Depending on your specs., you can try with series 8290 os ASCO. This is a piston valve, very very reliable. Is a battle-horse.

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