MODULATING BALANCE PORTED THREE WAY VALVE

摘要

Provided is a three-way valve having and actuator (66) and first (100) and second (102) piston assemblies movable by the actuator (66) and arranged in tandem, wherein each piston assembly (100,102) has a backside (104,106) in fluid communication with a common pressure source for pressure balancing the piston assemblies (100,102). By having the backsides (104,106) in fluid communication with a common pressure source and by isolating the piston assemblies (100,102) from a main chamber, an axial load on the actuator (66) is minimized, thereby allowing for more compact valve designs.

主权项

1. A modulating balance ported three-way valve including:
a valve body having an inlet port, a chamber, and first and second outlet ports in fluidic communication with the inlet port via the chamber; an actuator having an output shaft; a connection rod disposed in the valve body and coupled to the actuator such that the actuator effects longitudinal movement of the connection rod; and first and second piston assemblies coupled to the connection rod and each having a backside in fluid communication with a common pressure source for pressure balancing the piston assemblies, wherein the first and second piston assemblies are movable between a first position allowing fluid entering the inlet port to flow through the first outlet and preventing fluid flow through the second outlet, a second position preventing fluid flow through the first outlet and allowing the fluid to flow through the second outlet, and a plurality of third positions allowing a varying amount of the fluid to flow through the first and second outlets.