Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1995-03-13
1997-10-07
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
056738978
ABSTRACT:
A valve/actuator combination to operate off of low pneumatic pressures for use on tanker railcars 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 dosing 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.
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Crochet Kevin W.
Sentilles, III Edward A.
ProVaCon, Inc.
Walton George L.
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