Title: Pneumatically operated pilot relay and system and diverting relay construction utilizing the same or the like

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Abstract: A pneumatically operated pilot relay having an outlet for sending a pneumatic pilot output when the pilot relay receives a pneumatic signal of a certain magnitude, the pilot relay having a selector for selecting within limits the magnitude of the pneumatic signal that is required for the pilot relay to produce the pneumatic pilot output. The pilot relay terminates the pneumatic pilot output when the pneumatic signal falls to another certain magnitude, the other certain magnitude being a fixed differential from the selected magnitude thereof. When utilized in a pneumatic control system along with a diverting valve, the pneumatic output from the pilot relay will switch the diverting valve from one operating condition thereof to another operating condition thereof with a snap action and when the pilot output is terminated, the diverting valve switches back from the other operating condition thereof to the one operating condition thereof with a snap action, such snap action being without regard to the rate of change of the input signal.


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