US 8,573,559 B1 · Control valve with area independent pressure sensing

Abstract

A control valve includes a valve body with a longitudinal bore into which a first port, a second port, and a workport communicate. A valve element is slideably received within the longitudinal bore and has a valve element bore extending inwardly from one end. An aperture extends through the valve element to provide a fluid path between the workport and selectively the first port and the second port in different positions of the valve element in the longitudinal bore. A slug of solid material is received within the valve element bore and is operatively connected to transfer a force to a stationary component of the control valve without the force being applied to the valve element. This arrangement results in force due to pressure in the longitudinal bore acting on only an annular surface at the one end of the valve element.

Claims18

Dependent claims

An electrohydraulic control valve comprising:

a valve body having a first bore with a first port and a workport in communication with the first bore;
a valve element slideably received within the first bore for controlling fluid flow between the first port and the workport, and having a first end from which a valve element bore extends into the valve element;
an electrically powered actuator operatively coupled for moving the valve element;
and
a slug received within the valve element bore and operatively coupled to transfer a force produced by pressure in the valve element bore to a stationary component of the control valve thereby preventing the pressure in the valve element bore from affecting motion of the valve element, wherein the force is transferred without being applied to the valve element.

2 more elements

Dependencies are inferred from the claim text.

Control valve with area independent pressure sensing

Life of this patent

Control valve with area independent pressure sensing

Life of this patent

Abstract

Claims18