Patent attributes
A vacuum breaker valve is provided, including: a barrel member, a biasing assembly, a water stop gasket and a plate. The biasing assembly is abutted within the barrel member. The water stop gasket is disposed in the barrel member and abuts against the biasing assembly. The water stop gasket has a water stop portion which is deformable to close at least one air passage of the barrel member. The plate is located between the inlet end and the water stop gasket, and its engaging flange structure is blockable, in a direction toward the inlet end, by a shoulder portion of the barrel member. The biasing assembly normally drives the water stop portion of the water stop gasket apart from the at least one air passage to keep the at least one air passage non-closed.
