PILOT VALVE OF PRESSURE REDUCING VALVE TYPE

摘要

PROBLEM TO BE SOLVED: To provide a pilot valve of pressure reducing valve type capable of relieving an impact to be generated when an actuator is stopped and assuring a good responsiveness for the actuator to a quick operation of an operating member. SOLUTION: The pilot valve has a first oil passage and a second oil passage, wherein the first passage is located between the spools 6 of decompression valve parts 2A and 2B and an inter-port sliding wall surface 10 and consists of a slender meterout notch 20 having a constant section shape while the second passage is formed of a bleedoff passage 21 to be open in the neutral position and to open and close in a specified position in association with the vertical motions of the spools 6 owing to the residual pressure of an output port 13A. The residual pressure is decompressed only by the first passage if the spools 6 is pushed up to above the specified position when a direction selector valve 30 is going to return to the neutral position in association with the return of an operating lever 3 to the neutral position, and if the spools 6 are lowered to the specified position, decompression is made both in the first and the second oil passage. When the operating lever 3 is turned from the neutral position to the a-direction, the pressure oil at the output port 13B is returned to the tank port 11 both in the first and the second oil passage.