Disc assembly with branch hole for fluid flow control device

摘要

A disc assembly for a fluid flow control device includes an annular disc member, a disc holder, a relief bore, at least one branch passage, and an annular recess formed in the disc holder. The relief bore is formed in a first side of the disc holder along a central axis of the assembly. The annular recess is formed in the first side of the disc holder and is disposed coaxially with the relief bore for accommodating at least a portion of the annular disc member. The at least one branch passage is formed in the disc holder and provides fluid communication between the relief bore and the annular recess such that during use pressurized fluid that accumulates in the annular recess between the disc member and the disc holder can be relieved through the relief bore via the branch passage.

主权项

1. A fluid flow control device, comprising:
a valve body comprising an inlet, an outlet, and a valve port disposed between the inlet and the outlet; and an actuator coupled to the valve body for controlling the flow of fluid from the inlet to the outlet via the valve port, the actuator comprising a disc assembly and a diaphragm operably coupled to the disc assembly, the disc assembly disposed in the valve body and adapted for displacement relative to the valve port in response to pressure changes sensed by the diaphragm, the disc assembly comprising: an annular disc member, a cylindrical disc holder having a first side facing toward the valve port and a second side facing away from the valve port, a relief bore formed in the first side of the disc holder along a central axis of the disc holder, an annular recess formed in the first side of the disc holder, the annular recess disposed coaxially with the relief bore and accommodating at least a portion of the annular disc member, and at least one branch passage formed in the disc holder and providing fluid communication between the relief bore and the annular recess, such that any pressurized fluid in the valve body that accumulates in the annular recess between the annular disc member and the disc holder can be relieved through the relief bore via the branch passage.