Valve and actuator in combination

Details Valve and actuator in combination Valve and actuator in combination

1997-10-06

1999-07-20

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

92 62, 92 65, 10537707, 137244, 137382, 13761411, 141348, 251144, 251214, 251332, 251333, 2513353, F16K 31122, F16K 2712

Patent

active

059246723

ABSTRACT:
A valve and actuator in combination with a transportation tank to operate off of low pneumatic pressures including a valve having a valve body with a tank end, a valve seat near the tank end of the valve body, the valve seat having a valve sealing surface; a stem chamber extending through the valve body, the stem chamber having an actuator port, a seat port, and an outlet port; a valve stem slidably positioned in the stem chamber, the valve stem having a plug end and a plug attached to the plug end, the plug having a plug sealing surface to sealingly contact the valve sealing surface; an actuator having a hollow housing with a valve end, the valve end attached to the valve body; a plurality of piston assemblies, each having a piston slidable in the housing and a partition fixed in the housing, the piston and the partition defining an actuator chamber; piston spacers joining the pistons so that each piston is fixed in position with respect to the others; the pistons being operatively joined to the valve stem; a helical coil for generating a biasing force to bias the plug sealing surface against the valve seat sealing surface thereby closing the valve; and a passage for introducing pressurized fluid into the actuator chambers so that the pressurized fluid exerts a force against the pistons sufficient to overcome the biasing force to open the valve.

REFERENCES:
patent: 2901888 (1959-09-01), Swift
patent: 3152607 (1964-10-01), Lundeen
patent: 3554088 (1971-01-01), Bruyn
patent: 4585207 (1986-04-01), Shelton
patent: 4934652 (1990-06-01), Golden
patent: 5673897 (1997-10-01), Crochet et al.

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