Patent ID: 9261116
Filing Date: 2016-02-16
CPC Classification: F15B,F16K,Y10T

Claim Text:
1. A hydraulic spool valve, comprising: a housing, having a pair of first ports; a valve element, comprising a generally cylindrical body having an enclosed passage extending transversely therethrough, the valve element being selectively moveable within the housing between a first closed position in which the enclosed passage is misaligned with the first ports, and a second open position in which the enclosed passage is substantially aligned with the first ports, allowing fluid communication between the first ports; a first piston, coupled to the valve element, hydraulic pressure against the first piston causing helical translation of the piston in a first direction, and motion of the valve element in a first direction from the first position toward the second position; and a first biasing member, configured to bias the first piston and the valve element toward the first position.