Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1980-04-07
1981-10-20
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277212FB, 74 182, F04B 2100, F16J 1550
Patent
active
042956536
ABSTRACT:
The invention has especial utility for providing completely safe hermetic sealing of actuators extending into highly sensitive or isolative process equipment, such as that using atomic radiation. The invention uses a general principle taught by the inventor's prior U.S. Pat. No. 3,933,052. The actuator is hermetically sealed by the aid of a flexible diaphragm, and the diaphragm is made safe by pressure compensation. A sealing liquid confined on the outside of the hermetic diaphragm applies the same pressure to the outside face of the diaphragm as is applied by the process atmosphere to the inside face of the diaphragm. According to the embodiment illustrated in that patent, a diaphragm (actually a bellows) entirely separate from the actuator was exposed to the process atmosphere to apply its pressure to the sealing liquid. According to the present invention, a diaphragm which accommodates the movement of the actuator and accomplishes the hermetic sealing also transmits the pressure of the process atmosphere to the sealing liquid. The present invention also has some features of "fail-safe" nature and achieves other simplification. Also, it provides a temporary seal that permits servicing of the outer packing around the actuator.
REFERENCES:
patent: 2731282 (1956-01-01), McManus et al.
patent: 3620652 (1971-11-01), Jaspers et al.
patent: 3815925 (1974-06-01), Mattoon
patent: 3933052 (1976-01-01), Coles
Darbo Howard H.
Smith Robert I.
Zero-Seal, Inc.
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