Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Patent
1991-10-07
1992-08-18
Hepperle, Stephen M.
Valves and valve actuation
Fluid actuated or retarded
Flexible wall expansible chamber reciprocating valve actuator
137606, 2513352, F16K 31126
Patent
active
051392259
ABSTRACT:
A pneumatically controlled valve system is provided featuring simplified modular construction, reduction of moving parts, improved control of valve operation and increased resistance to corrosive effects of transfer fluid used with the valve. In this invention a 3-way valve system is described which has a valve body constructed of modules of polyvinylidene fluoride polymer (PVDF) removably and operably attached to each other in such a way as to removably contain and retain double diaphragm sliding valve stem assembly of known design which removably seals a fluorocarbon polymer (PTFE) stem to the PVDF seat integral to the valve body to close and open the valve fluid inlet ports and sealingly separates the pneumatic pressurizing gas from the transfer fluid. The operation of the valve is pneumatically controlled through specially designed, removably attached gas inlet and outlet ports with orifices of pre-selected lengths and internal diameters designed to affect the introduction rate of the pressurizing gas which drives the valve stem assembly by the deflection of the upper and lower diaphragms of the valve stem assembly, thus reducing shock to the valve system by rapid valve closure and possible damage to valve components.
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Olson Steve H.
Peugh Richard L.
Duffy Wayne E.
Hepperle Stephen M.
Micro)n Technology, Inc.
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