Pneumatic relayA pneumatic relay supplies a controlled output pressure to a load or utilization device, such as an actuator or a piston, in response to an input signal, a pressure or a force. Electro-pneumatic converters, such as pneumatic relays are in common use as field instruments mounted in pipeline systems for controlling the process fluid. In typical pneumatic relay device, a multiple diaphragm assembly includes a pilot diaphragm defining a common wall between a pilot chamber and an exhaust chamber. A supply chamber is coupled or extended from the output chamber and interconnected thereto by a suitable spring-loaded valve assembly. Pneumatic relays are required to function in either a proportional or an on/off mode.
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