Three-way proportional pressure reducing control valve

摘要

A three-way proportional pressure reducing valve includes a valve body and a cylindrical valve spool. Five chambers are formed between the valve body and the cylindrical valve spool, respectively a fifth chambers, a first chamber, a second chamber, a third chamber and the fourth chamber. The first chamber connected to a high pressure inlet port P, the second chamber connected to a oil port A and the third chamber connected to a low pressure outlet port T. A first control edge being fitted between the first chamber and the second chamber, a second control edge being fitted between the second chamber and the third chamber. A first passage being located between the fifth chamber and the second chamber for connecting the second chamber to the fifth chamber, a second passage being located between the fourth chamber and the third chamber for connecting the fourth chamber to the third chamber. The present invention mainly provides a three-way proportional pressure reducing valve which can be achieved to control arbitrary pressure course change between pressure P at the constant pressure source and the oil tank at zero pressure by two damping adjustable control edges and the pressure feedback means of the chamber. The aim of the present invention is to solve the technological problem of change-over only within two limit value of zero pressure and maximum pressure and unable to control the intermediate pressure, which exists in the technology now available.