Patent ID: 9644760
Date: 2017-05-09
CPC Classifications: F16F,F16K,Y10T

Claim:
1. A damping valve comprising: a valve seat member provided with a port; a valve body that opens or closes the port; a back-pressure chamber configured to bias the valve body toward the valve seat member using an internal pressure; a pilot passage configured to reduce a pressure upstream of the port and guide the pressure into the back-pressure chamber; and a pilot valve provided in the middle of the pilot passage, the pilot valve being configured to control the internal pressure of the back-pressure chamber, wherein the pilot valve has a pilot valve seat member and a pilot valve body, the pilot valve seat member having an cylindrical valve container provided with a penetrating hole connecting the inside and the outside, the penetrating hole communicating with the port, and an annular pilot valve seat provided in an end of the valve container, and the pilot valve body having a large diameter portion, a small diameter portion slidably inserted into the valve container, and a concave portion provided between the large diameter portion and the small diameter portion to face the penetrating hole, and an end of the large diameter portion is seated on or unseated from the pilot valve seat to open or close the pilot passage.