Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1984-10-04
1986-11-04
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166321, 137155, 417112, E21B 3410, F04F 108
Patent
active
046205977
ABSTRACT:
Disclosed is a bellows control valve with means to pressurize the bellows chamber to very high pressure without creating a significant detrimental differential pressure across the bellows.
REFERENCES:
patent: 2339487 (1944-01-01), King
patent: 2391605 (1945-12-01), Walton
patent: 2698024 (1954-12-01), Canalizo
patent: 2761465 (1956-09-01), Garrett et al.
patent: 2952268 (1960-09-01), Blum
patent: 2994335 (1961-08-01), Dudley
patent: 3318322 (1967-05-01), Garrett
patent: 3424099 (1969-01-01), Peters
patent: 3613712 (1971-10-01), Garrett
patent: 4151857 (1979-05-01), DeMoss
Booth John F.
Crutsinger Gerald G.
Gundel Norman L.
Kisliuk Bruce
Novosad Stephen J.
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