Pressure control valve and control valve

Abstract

In order to provide a pressure control valve that does not result in an increase in the number of parts and assembly steps, and that can prevent or suppress the occurrence of problems that produce abnormal noise by a pilot valve body vibrating from receiving the fluid pressure from a fluid and colliding with a pilot valve seat member when the pilot valve body is in the open valve position. This pressure control valve is provided with a main valve part that comprises: a main valve body; and a valve storing body that is equipped with a main valve seat for seating the main valve body, and that has a pilot chamber for slidably storing the main valve body. The pressure control valve is further provided with a pilot valve part that opens by the pilot valve body being separated from the pilot valve seat when the pressure inside of the pilot chamber surpasses a prescribed pressure, and that comprises: the pilot valve body; and a pilot valve seat member that is equipped with a pilot valve seat that can seat the pilot valve body. The pilot valve body is configured to have a hydraulic fluid passageway having a hydraulic fluid inlet that opens on the pilot chamber side, and at least three hydraulic fluid outlets that are formed at the opposite side from the side on which the hydraulic fluid inlet faces the pilot chamber and are formed in the direction of the pilot valve, the hydraulic fluid passageway having a shape in which each passage heading toward each of the hydraulic fluid outlets from the hydraulic fluid inlet is arranged at an equal angle.

Description

technical field [0001] The present invention relates to a pressure control valve employed in a hydraulic circuit for industrial vehicles and the like and a control valve including the pressure control valve as a constituent element. Background technique [0002] Conventionally, as pressure control valves used in hydraulic circuits for industrial vehicles, etc., refer to Figure 6 Instead, it is understood as a balanced piston type pressure control valve as shown below. This kind of pressure control valve V is set between the input port a1c for receiving the operating fluid and the tank port a1d connected to the storage tank for storing the operating fluid, and includes a main valve part a4 and a pilot valve part a5. The main valve part a4 uses the main The valve body a6 and the valve housing body a7 including the main valve seat a7a on which the main valve body a6 can be seated and the guide chamber a7b which slidably accommodates the main valve body a6 are formed. The valv...

AI Technical Summary

Problems solved by technology

Therefore, in the case where the pilot valve body a8 is eccentric with respect to the pilot valve seat a9a, there arises a problem that when the operating fluid flows through the gap, the pilot valve body a8 receives the hydraulic pressure of the fluid and vibrates, and contacts the pilot valve seat member a9a. Unfavorable situation of abnormal sound due to collision

[0006] However, in the structure described in this patent document 1, since a guide member is provided separately, there arises another kind of problems as follows: the number of parts and assembly labor increase, and the manufacturing cost increases.

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