Patent ID: 6161585
Filing Date: 2000-12-19
Classification: G05D,Y10T

Abstract:
A proportional solenoid operated pressure reducing control valve comprising:an elongate cylindrical housing having an axial throughbore between an outer end and an inner end defining an interior chamber, the inner end being receivable in a solenoid, in use, a plurality of axially spaced side port openings proximate the outer end defining a cylinder port and a pressure port, and a tank opening proximate the outer end defining a tank port;a valve member comprising a cylindrical body movable in the chamber at the outer end for selectively controlling fluid flow through the interior chamber between said tank port and said cylinder port in a neutral position or the cylinder port is modulating between said pressure port and said tank port in a regulated position, the valve member including an axially extending throughbore;dividing means in the valve member for separating the valve member throughbore to define an outer chamber and a control chamber; anda solenoid plunger, movable in the interior chamber at the inner end, operatively associated with the valve member for positioning the valve member responsive to energization of a solenoid, in use,the valve member further comprising a first passage therethrough providing fluid communication between the outer chamber and the interior chamber to provide a drain to the tank port and a second passage therethrough opening into the control chamber providing fluid communication between the cylinder port and the control chamber so that control pressure from the pressure port acts only on the dividing means of the valve member.