Electromagnetic valve

摘要

A piston is configured by a piston body and a support such that the piston is divided, along a direction of axis line, into the piston body, which is formed integrally with a valve element, and the support, which is provided separately from the valve element. A piston ring, which slides along a body, is held between the piston body and the support. The piston body is constantly in contact with one side face of the piston ring, and the support is constantly in contact with the other side face of the piston ring.

主权项

1. A pilot operated electromagnetic valve comprising:
a body having a lead-in port through which a fluid is led in, a lead-out port through which the fluid is led out, and a main valve hole provided in a main passage joining the lead-in port to the lead-out port; a driven member integrally formed with both a main valve element and a piston, wherein the main valve element opens and closes a main valve by moving toward and away from the main valve hole and wherein the piston separates the main passage from a back pressure chamber; a pilot valve element that opens and closes a pilot valve by moving toward and away from a pilot valve hole, the pilot valve hole being provided in a sub-passage joining the lead-in port to the lead-out port by way of the back pressure chamber; and a biasing member that biases a support in a direction in which the support is brought close to a piston body, wherein the piston is configured by the piston body and the support such that the piston is divided, along a direction of axis line, into the piston body, which is formed integrally with the main valve element, and the support, which is provided separately from the main valve element, wherein a piston ring, which slides along the body, is held between the piston body and the support, and wherein the piston body is constantly in contact with one side face of the piston ring, and the support is constantly in contact with the other side face of the piston ring.