Hydraulic pilot valve

A hydraulic pilot valve comprising:

• a valve body;
• a return chamber formed inside the valve body;
• a central pipeline extended from the lower part of the return chamber to the bottom surface of the valve body;
• a return port formed on one side of the bottom surface of the valve body;
• an auxiliary pipeline extended from the lower side of the central pipeline to the return port;
• a supply chamber which is formed in the lower part of the return chamber and has a space in which hydraulic oil is stored;
• a supply port formed on the other side of the bottom surface of the valve body;
• a bush mounted to surround at least a part of the central pipeline;
• at least one spool which is inserted into the valve body to be lifted up and down and to control a flow of the hydraulic oil;
• at least one spool hole into which the spool is inserted to form a space for guiding elevation of the spool, which communicates with the return chamber, and which is communicated with or blocked from the supply chamber by the elevation of the spool;
• at least one valve chamber communicating with the spool hole and formed at the lower part of the spool hole;
• and
• a damping unit formed on one side of the valve chamber to communicate an area of the valve chamber and the central pipeline with each other,
• wherein at least some of the hydraulic oil supplied to the supply chamber flows to the valve chamber or the central pipeline through the damping unit according to the elevation of the spool.