Control valves

Control valves

Industry: Industrial valves

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Control valves

fail-closed

Industrial valves; Control valves

Or normally closed. Another way of describing an air-to-open actuator. Approximately 80% of all spring return diaphragm operators in the field are of this construction.

fail-open

Industrial valves; Control valves

Or normally open. Another way of describing an air-to-close actuator.

needle valve

Industrial valves; Control valves

A type of valve having a small orifice and a threaded, needle-like plunger. It allows precise regulation of flow, although it is generally used for, and is capable of, only relatively small flow ...

relief valve

Industrial valves; Control valves

A type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.