Fluid handling – With lock or seal – Locks against rotary motion
Patent
1977-11-21
1978-12-19
Weakley, Harold W.
Fluid handling
With lock or seal
Locks against rotary motion
251161, 251175, 251188, 251192, F16K 3500
Patent
active
041301293
ABSTRACT:
A plug valve, especially for use in lines carrying abrasive materials and materials at high temperatures and pressures. The valve body is rotatable in a valve casing having inlet and outlet ducts to bring a port in the valve body into communication with the inlet and outlet ducts. Recesses are provided in the valve body wall for closely fitted sealing plugs. The outer faces of these plugs conform to the wall of the valve body. A fluid reservoir within the valve body is connected to the recesses by passageways. A moveable piston is provided in the reservoir to force hydraulic fluid under controllable pressure into the spaces between the rear wall of the recesses and the sealing plugs, thereby permitting the sealing plugs to be maintained in fluid-tight contact with the inner wall of the casing.
REFERENCES:
patent: 1857321 (1932-05-01), Nemec
patent: 2299341 (1942-10-01), Ohls
patent: 2567032 (1951-09-01), Schmidt
patent: 2996083 (1961-08-01), Huska
Finkel Robert Louis
Weakley Harold W.
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