Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Patent
1982-09-24
1985-06-25
Chambers, A. Michael
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
137613, 251159, 251187, 251195, 251204, F16K 336, F16K 2500
Patent
active
045247960
ABSTRACT:
The invention is a flow and pressure-sealing valve for use with abrasive solids. The valve embodies special features which provide for long, reliable operating lifetimes in solids-handling service. The valve includes upper and lower transversely slidable gates, contained in separate chambers. The upper gate provides a solids-flow control function, whereas the lower gate provides a pressure-sealing function. The lower gate is supported by means for (a) lifting that gate into sealing engagement with its seat when the gate is in its open and closed positions and (b) lowering the gate out of contact with its seat to permit abrasion-free transit of the gate between its open and closed positions. When closed, the upper gate isolates the lower gate from the solids. Because of this shielding action, the sealing surface of the lower gate is not exposed to solids during transit or when it is being lifted or lowered. The chamber containing the lower gate normally is pressurized slightly, and a sweep gas is directed inwardly across the lower-gate sealing surface during the vertical translation of the gate.
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patent: 4338960 (1982-07-01), Ashdown
patent: 4402337 (1983-09-01), Schuurman
Ayers, Jr. William J.
Carter Charles R.
Griffith Richard A.
Loomis Richard B.
Notestein John E.
Chambers A. Michael
Hamel Stephen D.
Hightower Judson R.
Larcher Earl L.
The United States of America as represented by the United States
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