Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1981-11-17
1984-06-05
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166321, 92185, E21B 4312
Patent
active
044523106
ABSTRACT:
A dynamic metal-to-metal seal for use in a double acting piston and cylinder for use in high pressures and temperatures. First and second metal cup seals engage the piston and face in opposite directions for sealing against the cylinder wall whereby the higher pressure in the cylinder acting against the first or second seal will move the piston. In order to prevent high differential pressures across the seals when the piston is actuated, means are provided for transmitting fluid pressure from the lower pressure in the cylinder to the cylinder between the cup seal. The piston includes first and second oppositely directed seats with first and second metal seals telescopically movable on the piston adjacent one of the seats and each metal seal includes a sealing surface adapted to mate with one of the seats. Each metal seal also includes an outwardly directed cup seal extending away from their seats and sealingly engaging the cylinder. First and second passageways extend from the inside of each cup of the seals through a seat and into the cylinder behind the outwardly directed cup seals. The first and second metal seals are engagable with each other whereby when one metal seal is seated the other metal seal is unseated allowing fluid pressure to flow through the unseated seal to provide a lower differential pressure across the sealing seal.
REFERENCES:
patent: 2364823 (1944-12-01), Schnell
patent: 2757993 (1956-08-01), Flick
patent: 2977167 (1961-03-01), Barnhart
patent: 3592105 (1971-07-01), Fryklund
patent: 3845818 (1974-11-01), Deaton
patent: 4062406 (1977-12-01), Akkerman et al.
patent: 4161219 (1979-07-01), Pringle
Eatwell William D.
Pringle Ronald E.
Camco Incorporated
Neuder William P.
Novosad Stephen J.
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