Damped fluid pressure valve operator with selective back seat

Details Damped fluid pressure valve operator with selective back seat Damped fluid pressure valve operator with selective back seat

1977-05-24

1978-11-14

Maslousky, Paul E.

Expansible chamber devices

Convertible, or changeable by assembly or disassembly

92 8, 92 136, 92128, 92130D, F15B 1522, F15B 1524

Patent

active

041250605

ABSTRACT:
An actuator, in which fluid pressure on a piston advances a stem against retractive force provided by a spring, a hydraulic dashpot is provided for the stem, and a stroke varying cushion is used for preventing engagement of a back seat between the stem and housing except when a seal is desired.

REFERENCES:
patent: 1043399 (1912-11-01), Cole
patent: 1706812 (1929-03-01), Pfau
patent: 2896541 (1959-07-01), Barton
patent: 3176801 (1965-04-01), Huff
patent: 3789875 (1974-02-01), McGee

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