Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1986-08-08
1988-07-05
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
92 49, 92 97, 92 98D, 13762527, 13762566, F16K 1104
Patent
active
047547766
ABSTRACT:
Pressure fluid control valves include modular body structures made up of a plurality of end to end connected body parts which are preferably finish fabricated by injection molding of thermoplastic. An axially movable closure member is supported in coaxial bores formed in the assembled body parts and is characterized by a cylindrical plug engageable with opposed conical seat surfaces on adjacent body parts or spaced apart closure disks engageable with respective seat surfaces on a common body part to form a fluid-tight seal between inlet and exhaust ports and a working fluid transfer port, respectively. The closure plug or disks are molded of relatively soft plastic such as polyurethane and the closure plug may be molded directly on the closure member shaft. The shaft is supported by a differential area flexible rolling diaphragm or resilient sealed piston pilot actuator at one end and a mechanical actuator such as coil spring or other types of mechanism at the opposite end. The rolling diaphragm type pilot actuator provides for particularly low friction, fast response shifting of the closure member. The valve may be constructed in two and three way configurations and with various combinations of valve actuators.
REFERENCES:
patent: 3794075 (1974-02-01), Stoll et al.
patent: 4212320 (1980-07-01), Stoll et al.
patent: 4483508 (1984-11-01), Marsh et al.
patent: 4506694 (1985-03-01), Daghe et al.
patent: 4615353 (1986-10-01), McKee
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