Fluid flow sensing switch device--method of making

In a method of making a fluid flow sensing switch device having a housing means provided with a fluid flow passage therethrough defined by an inlet and an outlet separated by a valve seat controlled by a movable valve member that is operated by the pressure differential between said inlet and said outlet acting on a flexible diaphragm carried by said housing means, said device having an electrical switch construction operatively associated with said valve member and having contact means thereof disposed in said fluid flow passage so as to be exposed to fluid flow therethrough and being actuated by said pressure differential acting on said flexible diaphragm, the improvement comprising the steps of forming said contact means as a pair of spaced apart contacts, and mounting said pair of contacts on said flexible diaphragm and pivotally positioning a bridging contact member on said valve member so as to be pivotally mounted thereon and being positioned in spaced apart relation to said pair of contacts to make contact with said pair of contacts and thereby bridge said pair of contacts to close said switch construction upon actuation of said switch construction.