Motors: expansible chamber type – With motive fluid valve – Self-opening exhaust valve held closed by inlet pressure
Patent
1981-05-19
1983-11-15
Garrett, Robert E.
Motors: expansible chamber type
With motive fluid valve
Self-opening exhaust valve held closed by inlet pressure
91451, 91452, 251 25, 251DIG1, F01B 310
Patent
active
044148828
ABSTRACT:
A pneumatic drive for actuating switchable devices such as valves and the like includes a cylinder and a cylinder base, the cylinder having an annular slot which extends in a plane transverse to the axis of the cylinder between an interior cylinder space and the outside. A piston is movable within the cylinder space and is connected to one end of a piston rod, the other end of the rod being coupled to the device to be actuated. A supply line communicates pressurized gas to the cylinder space to move the piston away from the cylinder base, while a spring biases the piston in the direction toward the cylinder base. An annular groove is formed in at least one of two annular surfaces which bound the annular slot in the axial direction, and a sealing ring is seated in the groove for axial movement so that the ring projects into the annular slot in response to pressurized gas communicated through a branch line into the closed end region of the groove. Accordingly, the sealing ring seals the cylinder space when the latter is pressurized by gas supplied through the supply line.
REFERENCES:
patent: 4241644 (1980-12-01), Schertler
patent: 4258925 (1981-03-01), Guyton
Garrett Robert E.
Meyer Richard S.
VAT Aktiengesellschaft fur Vakuum-Apparate-Technik
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