Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1974-11-07
1976-04-13
Cline, William R.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251144, 137554, F16K 31363
Patent
active
039499634
ABSTRACT:
A bottom drain valve comprises a housing with an upper tubular portion with a top drain opening and an annular valve seat around the drain opening. The drain discharge connects laterally downwardly from the lower part of the upper tubular portion. A valve rod guide and sealing portion of the housing extends below and is aligned with the upper portion and has a valve rod guide bore therethrough. A lower cylindrical portion of the housing has a bottom wall with a piston passage bore and has a first drain chamber below the valve rod guide and sealing portion and a second piston chamber below the drain chamber. A piston guide chamber is defined between the first drain chamber and the second piston chamber. An actuating piston is movable in the second piston chamber and has a central hollow tubular portion which is guided in the piston guide chamber adjacent its upper end and guided through the piston bore adjacent its lower end and out of the lower cylindrical portion. The hollow tubular portion permits draining of the leakage liquid therethrough. A valve member including a rod portion extends through at least part of the hollow tubular portion of the piston and through the valve rod guide bore and the valve rod guide sealing portion. Removable pin means connects the lower end of the valve rod to the piston. The valve member has a valve head on the rod portion engageable on the valve seat to close the opening and it is movable with said rod portion upwardly off the valve seat to open the opening.
REFERENCES:
patent: 3052444 (1962-09-01), Kintnel
patent: 3390943 (1968-07-01), Myers
patent: 3417960 (1968-12-01), Stehlin
patent: 3838707 (1974-10-01), Wachowitz, Jr.
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