초록 ▼

A vacuum breaker valve assembly is provided including a housing mountable to a transport tank. The housing has a wall defining a passageway through the housing and there is a valve member movable within the housing. Structure is provided for permitting the valve member to move in response to variati

A vacuum breaker valve assembly is provided including a housing mountable to a transport tank. The housing has a wall defining a passageway through the housing and there is a valve member movable within the housing. Structure is provided for permitting the valve member to move in response to variations in tank pressure between (1) and open state when atmospheric air external of the tank is allowed to travel through the passageway and into the tank once a predetermined vacuum pressure condition is reached, and (2) a closed state wherein the passageway is sealed to prevent atmospheric air travel into the tank when the predetermined vacuum pressure condition in the tank has not been reached. A housing lid is mounted to the housing and includes a vent hole for allowing atmospheric air to enter the housing passageway. A bottom wall integral with the housing wall includes a vent hole therethrough communicating with the interior of the tank. The bottom wall vent hole is sized sufficiently small to prevent the valve member moving structure from fitting therethrough.

대표청구항 ▼

In a transport tank for transporting bulk quantities of food-grade liquids, a vacuum breaker valve assembly for permitting atmospheric air to enter the transport tank having a vacuum pressure condition therein, the assembly comprising: a cylindrical housing mountable to the tank; a valve member havi

In a transport tank for transporting bulk quantities of food-grade liquids, a vacuum breaker valve assembly for permitting atmospheric air to enter the transport tank having a vacuum pressure condition therein, the assembly comprising: a cylindrical housing mountable to the tank; a valve member having a stem with first and second enlarged ends where the valve member is movable in the housing between (1) a first position in which the valve assembly is closed to seal the tank from the atmospheric air, and (2) a second position in which the valve assembly is open to admit the atmospheric air to the tank when the tank reaches a predetermined vacuum pressure condition; a spring biasing the movable member towards the first position with a predetermined biasing force; an annular flexible seal member having a central aperture therethrough and opposed sides mounted in the housing with the housing having a first region on one side of the seal member and a second region on the other side of the seal member with the first region communicating with the second region with the valve member in the second position; an annular bottom housing wall cooperating with the other side of the seal member to define the second region and having a central aperture aligned with the seal central aperture with the stem extending through the seal central aperture having the first enlarged end in the first region and the second enlarged end in the second region with the second enlarged end being sized sufficiently large to prevent the stem from fitting through the bottom wall aperture and dropping into the tank and to close the sealing member aperture sealing the first and second regions from each other with the valve member in the first position; and lid means securely mounted to the housing cooperating with the one side of the sealing member to define the first region and having a central aperture therethrough for entry of the atmospheric air into the housing first region and being aligned with the sealing member and bottom wall apertures with the stem first enlarged end substantially blocking the lid means central aperture to limit leakage of product in the tank through the lid means aperture with the valve member in the first position.