What kind of valve will do this?

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A valve is needed that can pressurize a system, maintain pressure temporarily, and then exhaust it on command. A regular gate valve is suggested as a potential solution, depending on the size of the pipe or tubing used. An instrument valve may also be suitable for this application. The requirements emphasize portability, compactness, and operation at low pressures. Selecting the right valve will depend on specific system dimensions and pressure needs.
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I need a valve that will pressurize a system, then leave the system pressurized for a time, then exhaust the pressure on command. I need it to be easily portable and quite small, and will run at pretty low pressures. What kind of valve would do this for me?
 
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A regular gate valve will work just fine. depends how small your pipe/tubing is. maybe just an instrument valve
 
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