Valves and valve actuation – Heat or buoyancy motor actuated
Patent
1983-06-24
1985-12-31
Yeung, James C.
Valves and valve actuation
Heat or buoyancy motor actuated
251 45, F16K 31385, F16K 3140
Patent
active
045616272
ABSTRACT:
A valve body defines an inlet and an outlet with a valve seat therebetween. A flexible diaphragm valve member has an outer portion supported by the valve body and a movable inner portion which cooperates with the valve seat to control the flow of liquid from the inlet to the outlet. A small bleed hole extends through the diaphragm valve member and provides a limited flow of liquid which is adapted to be vented to the outlet through a slightly larger vent passage defined by the valve body. In one embodiment, the vent passage is opened and closed by over-center snap movement of a flexible concaved bimetal disc positioned within the vent passage. The disc is heated by a small electric resistance coil when it is desired to open the valve, and when the coil is deenergized, the disc is cooled by the liquid flowing within the vent passage. In another embodiment, the vent passage is opened and closed by a flexible member in the form of a diaphragm disposed adjacent a metal disc forming an armature for a solenoid. In a further embodiment, the vent passage is opened and closed by a snap-acting strip or disc coupled to one or more piezoelectric elements or layers and engaging the flexible member.
REFERENCES:
patent: 2461772 (1949-02-01), Ray
patent: 2572175 (1951-10-01), McPherson
patent: 3443582 (1969-05-01), Linden
patent: 3763881 (1973-10-01), Jones
patent: 3799496 (1974-03-01), Esten
patent: 3856259 (1974-12-01), Doherty, Jr.
patent: 3873059 (1975-03-01), Meckstroh
patent: 4027848 (1977-06-01), Mundi
patent: 4248402 (1981-02-01), Meckstroh
patent: 4295488 (1981-10-01), Book
patent: 4390157 (1983-06-01), Meckstroh
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