Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1989-09-11
1991-03-19
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137907, 251901, G05D 1610
Patent
active
050002210
ABSTRACT:
To control the flow of a fluid from an environment to a vacuum source, a device including a piston (2) is mounted in the path of the fluid. The path is not vented so that the mass of fluid entering the device is equal to the mass exiting the device. The piston (2) is mounted so that it may constrict the path at a constriction point (5), and so that it may move in a direction (14) transverse to the flow of the fluid at the constriction point (5). The frontal face (15) of the piston (2) is exposed to the fluid in the path, and the distal face (16) of the piston (2) is exposed to a reference pressure (17). A restoring force, such as a spring (10) or the weight of the piston (2) is exerted on the piston (2) so as to tend to widen the path at the constriction point (5).
REFERENCES:
patent: 2918933 (1959-12-01), Boitnott
patent: 3053272 (1962-09-01), Babson
patent: 3138174 (1964-06-01), Gilpin
patent: 3237616 (1966-03-01), Daigh et al.
patent: 3605788 (1971-09-01), Brown
patent: 4732190 (1988-03-01), Polselli
patent: 4791956 (1988-12-01), Kominami et al.
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