Vacuum relief device
First Claim
1. In combination, an enclosed, liquid containing reservoir and a vacuum relief devicethe reservoir having a reservoir outlet from which liquid is to be dispensed and within which reservoir a vacuum below atmospheric pressure is developed on dispensing liquid from the reservoir outlet, the vacuum relief device is adapted to permit atmospheric air to enter the reservoir to reduce any vacuum developed in the reservoir, the vacuum relief device comprising an enclosed chamber having an air inlet and a liquid inlet, 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 air inlet in communication with air at atmospheric pressure such that the chamber is at atmospheric pressure, the liquid inlet connected by via a liquid passageway with liquid in the reservoir, the liquid inlet at a height below a height of liquid in the reservoir such that when pressure in the reservoir is atmospheric pressure, due to gravity the liquid from the reservoir fills the liquid passageway and, via the liquid passageway, fills the chamber to a height above the height of the liquid inlet and below the height of the air inlet, and we on dispensing liquid from the reservoir outlet increasing vacuum below atmospheric in the, reservoir, the height of liquid in the chamber decreases until the height of liquid is below the height of the liquid inlet and the liquid inlet is open to air in the chamber such that air in the chamber flows under gravity upward through the liquid passageway to the reservoir to decrease vacuum in the reservoir, a valve movable to open and close the liquid passageway.
1 Assignment
0 Petitions
Accused Products
Abstract
Liquid soap dispensers including a vacuum relief valve which comprises an enclosed chamber having an air inlet open to the atmosphere and a liquid inlet in communication with liquid in the reservoir and in which the liquid inlet opens to the chamber at a height below a height at which the air inlet opens to the chamber. The vacuum relief value permits relief of vacuum from the reservoir without moving parts or values.
52 Citations
21 Claims
-
1. In combination, an enclosed, liquid containing reservoir and a vacuum relief device
the reservoir having a reservoir outlet from which liquid is to be dispensed and within which reservoir a vacuum below atmospheric pressure is developed on dispensing liquid from the reservoir outlet, the vacuum relief device is adapted to permit atmospheric air to enter the reservoir to reduce any vacuum developed in the reservoir, the vacuum relief device comprising an enclosed chamber having an air inlet and a liquid inlet, 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 air inlet in communication with air at atmospheric pressure such that the chamber is at atmospheric pressure, the liquid inlet connected by via a liquid passageway with liquid in the reservoir, the liquid inlet at a height below a height of liquid in the reservoir such that when pressure in the reservoir is atmospheric pressure, due to gravity the liquid from the reservoir fills the liquid passageway and, via the liquid passageway, fills the chamber to a height above the height of the liquid inlet and below the height of the air inlet, and we on dispensing liquid from the reservoir outlet increasing vacuum below atmospheric in the, reservoir, the height of liquid in the chamber decreases until the height of liquid is below the height of the liquid inlet and the liquid inlet is open to air in the chamber such that air in the chamber flows under gravity upward through the liquid passageway to the reservoir to decrease vacuum in the reservoir, a valve movable to open and close the liquid passageway.
-
3. In combination, an enclosed, liquid containing reservoir and a vacuum relief device
the reservoir having a reservoir outlet from which liquid is to be dispensed and within which reservoir a vacuum below atmospheric pressure is developed on dispensing liquid from the reservoir outlet, the vacuum relief device is adapted to permit atmospheric air to enter the reservoir to reduce any vacuum developed in the reservoir, the vacuum relief device comprising an enclosed chamber having an air inlet and a liquid inlet, 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 air inlet in communication with air at atmospheric pressure such that the chamber is at atmospheric pressure, the liquid inlet connected by via a liquid passageway with liquid in the reservoir, the liquid inlet at a height below a height of liquid in the reservoir such that when pressure in the reservoir is atmospheric pressure, due to gravity the liquid from the reservoir fills the liquid passageway and, via the liquid passageway, fills the chamber to a height above the height of the liquid inlet and below the height of the air inlet, and wherein on dispensing liquid from the reservoir outlet increasing vacuum below atmospheric in the reservoir, the height of liquid in the chamber decreases until the height of liquid is below the height of the liquid inlet and the liquid inlet is open to air in the chamber such that air in the chamber flows under gravity upward through the liquid passageway to the reservoir to decrease vacuum in the reservoir, an air passageway from the air inlet to an air opening to the, atmosphere, wherein on increasing pressure above atmospheric pressure in the reservoir the height of liquid in the chamber increases until the height of liquid is above the height of the air inlet and the air inlet is open to liquid in the chamber such that liquid in the chamber flows through the air passageway to exit from the air opening, a valve movable to open and close at least one of the liquid passageway and the air passageway.
Specification