Patent ID: 8191857
Filing Date: 2012-06-05
Classification: F16K

Abstract:
1. A valve comprising: a valve body having spaced inlet and outlet ports separated by an intermediate valve seat in open communication with the inlet and outlet ports; a piston reciprocable within a bore in the valve body; a valve member being adapted to sealingly mate with the valve seat; a biasing member for normally biasing the valve member toward the valve seat; a linear motor assembly attached to the valve body, the linear motor comprising a plurality of stator discs, a plurality of stator coils, and a plurality of teeth defining a cylindrical opening, a slider positioned within the cylindrical opening, the slider having a plurality of teeth defining a generally cylindrical outer periphery of the slider, the outer periphery of the slider being smaller than the cylindrical opening, the slider being movable in a stepped manner in response to magnetic flux generated by electrical current passing through successive stator cores, wherein an interior hollow portion of the slider is hermetically sealed from the generally cylindrical outer periphery of the slider.