Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1998-09-25
2000-02-15
Recla, Henry J.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137205, 137508, 137907, 604118, 604119, 604121, 604319, 604321, 12820426, 12820524, F16K 3114
Patent
active
060241209
ABSTRACT:
A valve for relieving an excess negative pressure condition inside a medical device comprising a diaphragm with an inner periphery and an outer periphery and an actuator having a piston extending axially therefrom which is inserted through the inner periphery of the diaphragm. The piston comprises a plurality of legs that form a void therebetween at the free end thereof. The outer periphery of the diaphragm is sandwiched between the upper and lower housings so as to create a hermetic seal that separates the valve into a venting side and a suction side. To relieve an excess negative pressure condition the diaphragm is operable in one of two positions. In the first position, a biasing members forces the inner periphery of the diaphragm in sealing engagement around the circumference of the piston so that a hermetic seal is maintained between the suction side and the venting side. When negative pressure inside the medical device begins to rise, the inner periphery of the diaphragm moves in sealing engagement along the piston so that a constant sealing force is applied around the circumference of the piston until it reaches the plurality of legs at the free end thereof. As the inner periphery moves over the plurality of legs, the void establishes communication with both the suction side and the venting side, thereby permitting ambient air to vent into the suction side and lower the negative pressure therein.
REFERENCES:
patent: 4372336 (1983-02-01), Cornell et al.
patent: 4605400 (1986-08-01), Kurtz et al.
patent: 4768542 (1988-09-01), Morris
patent: 5634494 (1997-06-01), Martens
patent: 5871027 (1999-02-01), Shimizu et al.
Weilbacher Eugene E.
Yam Jacky S.
Huynh Khoa
Leonardo Mark S.
Recla Henry J.
Sherwood Services AG
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