Control Valve Assembly

摘要

Embodiments of the invention provide a control valve assembly that includes a piston slidably seated within a valve chamber and moveable between multiple positions to adjust a flow rate of fluid through the control valve assembly. The piston comprises flow zones and seal surfaces to define variable flow rates related to the position of the piston within the valve chamber and to selectively seal with the valve chamber.

主权项

1. A control valve assembly comprising:
a valve body; a valve chamber defined by the valve body; and a piston slidably seated within the valve chamber and movable between multiple positions to adjust a flow rate of fluid through the control valve assembly; wherein the piston extends from a tip end to a base end along a piston axis, and further comprises:
a tip flow zone proximate the tip end defining a tip variable flow rate related to the position of the piston within the valve chamber;a tip seal surface adjacent to the tip flow zone and configured to selectively seal with the valve chamber;an intermediate flow zone adjacent to the tip seal surface defining an intermediate variable flow rate related to the position of the piston within the valve chamber;an intermediate seal surface adjacent to the intermediate flow zone and configured to selectively seal with the valve chamber;a base flow zone adjacent to the intermediate seal surface defining a base variable flow rate related to the position of the piston within the valve chamber; anda base seal surface adjacent to the base flow zone and configured to selectively seal with the valve chamber.