Patent ID: 9695790
Date: 2017-07-04
CPC Classifications: F02M,F16K

Claim:
1. A hydraulic system comprising a high pressure fluid source and a hydraulic actuator fluidly connected to the high pressure fluid source, and a low pressure fluid system fluidly connected to the hydraulic actuator via a fluid return line, and a hydraulic valve, wherein the hydraulic valve comprises a return spring and an elongate member, which is movably arranged in its longitudinal direction for controlling a fluid flow, wherein the elongate member is biased to a closed position by means of the return spring, wherein the elongate member forms a needle, the hydraulic valve comprises needle receiving body having a needle seat, and the needle is engageable with the needle seat so as to control the fluid flow, wherein the needle receiving body comprises an internal bore forming a cylindrical guide for axially guiding the needle within the needle receiving body, the cylindrical guide is located at a distance from the needle seat, and an outlet chamber is provided between the needle seat and the cylindrical guide; the hydraulic valve comprises a valve housing for receiving the needle and needle receiving body; and the valve housing comprises a fluid inlet configured to supply fluid to the contact region of the needle and needle seat for urging the needle away from the needle seat, the cylindrical guide forms part of a needle chamber, which is located on the side of the cylindrical guide opposite to the outlet chamber, wherein the hydraulic valve comprise two outlets: a first fluid outlet fluidly connected to the outlet chamber and a second fluid outlet (