I have a problem that I though you could help me with. :)I need some kind of device that closes on high pressure. What are the options? The media is fluid, but it will contain some amount of gas. you didn't say what technology your valve was. If it is a rising stem gate valve, then a closing mechanism must turn the valve bushing dozens of times against varying torque, not insurmountable but also not trivial. If it is a ball valve or other 1/4 turn device then the options are much broader. If it is a solenoid valve then there are many electrical options.The valve manufacturer can provide torque information required to close the valve. With some luck you have a quarter turn valve like a ball valve or butterfly valve that could be used with a single acting piston actuator. The actuator supplier should select the actuator based upon the minimum air supply (or other supply source) and about 25% safety factor. Single acting includes a spring return for a failure position. If a fail-safe position is not part of the concern, then consider a double acting actuator with no spring. You often find actuators by looking for "automated valve" or "shutdown valve" suppliers.

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