Patent ID: 7322375
Filing Date: 2008-01-29
Classification: F16K,Y10T

Abstract:
1. A valve comprising: a manifold comprising ports; a sleeve coupled to the manifold, the sleeve comprising openings and radial grooves; a spool within the sleeve, the spool comprising openings; and a servo motor coupled to the spool; where the openings and radial grooves of the sleeve are configured to substantially pressure balance the spool within the sleeve; where openings of the of the spool are configured to selectively align with openings of the sleeve, upon rotation by the servo motor, to selectively connect ports of the manifold for gas or liquid routing; where the manifold comprises four ports; where the sleeve comprises four radial grooves, each of two radial grooves having four substantially equally spaced holes and each of the two other radial grooves having a set of substantially aligned holes; and where the spool comprises two sets of opposing slots, a first set of slots being located substantially 90 degrees from a second set of slots.