Hydraulic valve

A hydraulic valve comprising;

• a housing including a first hydraulic chamber and a second hydraulic chamber;
• a valve seat located in the first hydraulic chamber, wherein the valve seat has a tubular shape including a central passage and an open end, wherein the open end includes a valve seat contact surface;
• a valve member located in the second hydraulic chamber and including a valve member contact surface;
• and
• a biasing member that generates a biasing force to press the valve seat and the valve member so that the valve member contact surface contacts the valve seat contact surface, wherein
• when hydraulic pressure of the first hydraulic chamber is higher than that of the second hydraulic chamber, the hydraulic pressure of the first hydraulic chamber acts on the valve member through the central passage of the valve seat to separate the valve member from the valve seat against the biasing force of the biasing member so that the first hydraulic chamber and the second hydraulic chamber come into fluidal communication, and
• when hydraulic pressure of the second hydraulic chamber is higher than that of the first hydraulic chamber, a hydraulic pressure difference between the first hydraulic chamber and the second hydraulic chamber acts on the valve seat to separate the valve seat from the valve member against the biasing force of the biasing member so that the first hydraulic chamber and the second hydraulic chamber come into fluidal communication.