Fluid pressure actuator having bias element immersed in non-corr

Details Fluid pressure actuator having bias element immersed in non-corr Fluid pressure actuator having bias element immersed in non-corr

1981-08-24

1984-04-17

Maslousky, Paul E.

Expansible chamber devices

With means to control fluid flow from non-working chamber

92 77, 92130B, 92174, F01B 3118

Patent

active

044427573

ABSTRACT:
An improved valve actuator is provided for employment in environments such as subterranean wells where highly corrosive gases and fluids are contained in the well fluid which is normally pressurized and employed to operate the actuator. The bias element opposing the pressure induced movements of the piston unit of the actuator is disposed in an isolation chamber defined between two axially spaced, radial shoulders provided on the piston and having sealing engagement with the bore of the cylindrical wall, thus defining constant volume annular chamber that is isolated from the highly corrosive fluids and gases. The isolated chamber moves with the piston and thus does not provide fluid pressure opposition to the fluid pressure induced movement of the piston.

REFERENCES:
patent: 1481011 (1924-01-01), Joyce
patent: 2349345 (1944-05-01), Goepfrich
patent: 2817361 (1957-12-01), Mercier
patent: 3142157 (1964-07-01), Firth et al.
patent: 3905278 (1975-09-01), Ourdouillie

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