An adjustable pressure and vacuum limit switch valve comprising:
- a valve base having a pair of parallel exterior and interior plane base faces, and an aperture disposed through said valve base normal to said pair of plane base faces, said exterior plane face adapted and sized to conductively accept and secure a fluid flow pipe to said exterior plane face,
- a flexible elastic composition diaphragm having a first diaphragm face conductively coaxially sealed to said interior face of said valve base, sealing off the conduction of said fluid flow pipe,
- a valve top housing having a hollow dome interior, having a threaded top aperture coaxially disposed through the housing face opposed to said valve base, and having securing means conductively sealing said valve base to said valve top housing,
- a tubular valve cage sized and secured in said valve top housing, said valve cage having a flat first cage terminus securely disposed on the second diaphragm face and forming a second diaphragm seal, said valve cage having a second cage terminus disposed inside said valve top housing, said valve cage having an integral ledge coaxially formed on said valve cage coterminous with said flat first cage terminus, said integral ledge mating with a valve top housing coaxial ledge disposed adjacent to the securing means sealing said valve base to said valve top housing, said valve cage having a symmetrical coaxial cage aperture therein extending from said first cage terminus to said second cage terminus, said coaxial cage aperture symmetrically disposed along the valve bore axis, said cage aperture having an expanded volume at said second cage terminus and an expanded stepped volume at said first cage terminus,
- a valve plug having a mating symmetrical plug step adapted and sized to fit in and mate with said expanded stepped volume disposed at said first cage terminus, the first face of said valve plug sealed against said second face of aforesaid flexible diaphragm, said valve plug slidably moving coaxially in said valve cage in response to varying fluid pressure in said fluid flow pipe, a plug first spindle coaxially normally secured to the second face of said valve plug by the first spindle first terminus, and an annular groove formed around said first spindle adjacent to the second terminus of said first spindle, said first spindle adaptively sized to slide in said valve cage symmetrical coaxial cage aperture,
- a first pressurizing spring means secured in said valve top housing along said valve bore axis having one first spring means terminus bearing on said first spindle second terminus, and a second terminus of said first spring means bearing on an adjustable set screw secured in said valve top housing threaded aperture,
- an ON-OFF electrical switch having permanent securing means attaching said switch to a peripheral aperture in said valve cage, said aperture disposed parallel to said valve bore axis and along the exterior perimeter of said valve cage, said switch having a spring loaded push button detent extending from the switch body normally to said valve bore axis and into said annular groove of said first spindle, said ON-OFF switch electrically conductively wired normally ON and OFF as selected,
- said push button detent selectively conductively switching as required on engagement of said push button detent into and out of said annular groove of said first spindle on slidably moving said valve plug in said valve cage aperture, as fluid pressure varies on said flexible diaphragm.