Vacuum released valve
First Claim
1. A mechanism comprising a fluid containing reservoir having an inlet or outlet opening, and a valve for providing communication through an inlet or outlet opening, the valve disposed across the opening movable between a first closed position preventing flow through the valve and an open position permitting flow through the valve, the valve movable under externally applied forces to the first closed position and is retained in the first closed position until the pressure in the reservoir is a first vacuum level sufficiently below pressure when the valve moves from the first closed position to the open position.
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Accused Products
Abstract
These disadvantages of previously known devices, the present invention provides a vacuum released valve which closes an opening into a reservoir to passage therethrough until a sufficient vacuum is created with the reservoir as on initial dispensing of fluid from the reservoir.
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Citations
26 Claims
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1. A mechanism comprising a fluid containing reservoir having an inlet or outlet opening, and a valve for providing communication through an inlet or outlet opening,
the valve disposed across the opening movable between a first closed position preventing flow through the valve and an open position permitting flow through the valve, the valve movable under externally applied forces to the first closed position and is retained in the first closed position until the pressure in the reservoir is a first vacuum level sufficiently below pressure when the valve moves from the first closed position to the open position.
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24. A vacuum relief mechanism adapted to permit atmospheric air to enter a liquid containing reservoir to reduce vacuum developed in the reservoir,
the mechanism comprising a vacuum relief device and a one-way valve, the vacuum relief device comprising: -
an enclosed chamber having an air inlet and a liquid inlet, the air inlet in communication with air at atmospheric pressure, the liquid inlet in communication with liquid in the reservoir, the liquid inlet open to the chamber at a height which is below a height at which the air inlet is open to the chamber, the one-way valve disposed between the liquid inlet and the reservoir movable between;
(a) a first closed position preventing flow between the reservoir and the liquid inlet, (b) a second closed position preventing flow between the reservoir and the liquid inlet and (c) an open position permitting flow through the valve,the valve moving in from the first closed position to the open position moves through the second closed position the valve requiring external forces to be applied to force the valve to assume the first closed position, the valve moving from the first closed position to the open position when the pressure in the reservoir is a first vacuum level sufficiently below pressure at the liquid inlet, the valve biased to assume the second closed position, the valve moving from the second closed position to the open position when the pressure in the reservoir is a second vacuum level sufficiently below pressure at the liquid inlet, the first vacuum level being a greater vacuum than the second vacuum level. - View Dependent Claims (25, 26)
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Specification