Pressure balanced valve

摘要

The disclosed embodiments include a pressure balance valve that solves one or more problems associated with existing designs. For example, in one embodiment, a pressure balancing valve assembly is disclosed that provides a low cost frictionless assembly that is constructed to not seal the leak path between an inlet port and an outlet port. Instead, this leak path is minimized with small angle tapered plunger and a precision bored annulus to provide a defined area for the pressure drop to occur and to limit the flow from the inlet to the outlet.

主权项

1. A valve assembly comprising:
a body having a passageway connecting a first port and a second port; a tapered annular plunger located within an annular orifice, the plunger configured to move a valve head to close and open the passageway between the first port and the second port; a pressure balancing passageway within the plunger configured to transfer a first pressure from the first port to a plunger stem cavity; and a thin annulus located between the plunger and a side wall of the annular orifice, the thin annulus providing a pressure drop passageway between the plunger stem cavity and a second cavity having a second pressure associated with the second port when the valve is in a fully closed stationary position, the thin annulus having a tapered angle created by an angle of the tapered annular plunger and a ninety degree angle of the side wall of the annular orifice when the valve is in the fully closed stationary position, and wherein a leak path from the first port through the pressure balancing passageway to the second port is not sealed to reduce an amount of friction on the plunger as it moves.