Abstract: An electrical limit switch valve, having an essentially rigid plastic structural composition, is adapted to conductively secure a fluid flow pipe. A covering flexible elastic membrane diaphragm separates a valve base and piped fluid from a spring loaded ON-OFF electrical switch. The push button detent of the ON-OFF switch is operated normal to the valve bore axis. A valve plug slidably moves on the valve bore axis, the plug bonded at the first valve plug face to the second face of the flexible diaphragm, and the valve plug stem operates the push button detent of the ON-OFF switch. An adjustable actuating first pressurizing spring, coaxially disposed in the valve top housing along the valve bore axis regulates the fluid pressure at which the ON-OFF switch is actuated. An adjustable second pressurizing spring positioned normal to the valve bore axis is adapted to operate on a second spindle controlling the valve plug movement at fluid pressures below atmosphere pressure, in the fluid flow pipe.

Abstract: A fluid pressure regulator valve has a rigid plastic composition valve housing having a coaxial aligned opposed inlet port and outlet port, and a hollow cylindrical interior having four stepped successively larger selected bore diameters on serially proceeding from the bottom deep base bore to the top screw cap retainer bore. A cylindrical sealing solid piston has a first flat piston crown end face and an opposed second flat piston end face, the second end face having a larger diameter than the crown face, and has one diametrically concentric fluid transfer channel disposed in and circumferentially around the piston cylindrical axis adjacent to the first piston face. A cylindrical screw cap has a shaped hollow dome and screw threads secured in the hollow cylindrical valve housing interior. An interior fluid distribution annular washer is secured in an annular washer recess disposed in the interior face of the screw cap.

Abstract: Fluid transfer valves having a first and a second actuating means are functionally assembled from a common valve housing having coaxial aligned opposed inlet and outlet ports and a hollow cylindrical interior having four stepped bores, concentrically aligned on a housing cylindrical symmetry axis. A cylindrical sealing solid piston is disposed in the cylindrical deep bore of the housing. A concentric bore in the screw cap secures and provides a close linear alignment path for the sealing solid piston. The cap has multiple concentric radial apertures disposed in an interior integral cap collar, providing a flow path for fluid transfer. A concentric piston channel uniformly disposed in and around the axis of symmetry of the piston provides fluid transfer through the valve on controlled positioning of the piston. A first aperture connects the inlet port to the annular bore surrounding the piston, and a second aperture can connect the outlet port to the piston channel.