Electromagnetically operable proportional pressure control valve

摘要

An electromagnetically operable proportional pressure control device has a spool which is slidably housed in a cylindrical bore formed in a housing. A pressure chamber defined in the cylindrical bore communicates with an inlet port through a diametrically reduced bore and an outlet port through a return hole, a pilot valve and a return passage. The pressure difference produced between the inlet port and the pressure chamber causes the spool to move establishing a direct fluid communication of both ports. An oil flow from the inlet port into the pressure chamber is smaller than an oil flow from the pressure chamber to the return passage.