JPH031369U

JPH031369U -

Info

Publication number: JPH031369U
Application number: JP6269089U
Authority: JP
Priority date: 1989-05-30
Filing date: 1989-05-30
Publication date: 1991-01-09
Anticipated expiration: 2004-04-27
Also published as: JPH0616162Y2

Description

[Brief explanation of drawings]

第１図は本考案によるパイロツト操作逆止め弁
の一実施例を縦断面図にして示した流体回路図、
第２図は本考案の他実施例を示した図、第３図は
従来例を示した図である。１３……弁孔、１５……流体アクチユエータ、
１６……負荷流路、１８……給排流路、１９……
弁座、２０，３２……ポペツト弁体、２１……作
用室、２３，３５……凹部、２４，３３……凸部
、２８……パイロツトピストン、Ｖ……弁本体。 FIG. 1 is a fluid circuit diagram showing an embodiment of a pilot-operated check valve according to the present invention in a vertical cross-sectional view;
FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a diagram showing a conventional example. 13...Valve hole, 15...Fluid actuator,
16...Load channel, 18...Supply/discharge channel, 19...
Valve seat, 20, 32... Poppet valve body, 21... Action chamber, 23, 35... Concave portion, 24, 33... Convex portion, 28... Pilot piston, V... Valve body.

Claims

[Scope of utility model registration request]

A valve hole in which a load flow path connected to a fluid actuator and a fluid supply/discharge flow path are opened with a gap in the axial direction, and a valve seat is formed between the load flow path opening point and the supply/discharge flow path opening point. is provided in the valve body, and receives the acting force based on the fluid pressure from the load flow path on the back and seats on the valve seat to block the flow, and receives the acting force based on the fluid pressure from the supply and discharge flow path on the head. A poppet valve element is fitted into the valve hole so as to be able to slide freely in the axial direction from the valve seat to the load passage opening side so as to separate from the valve seat and obtain a free flow. The poppet valve body is pushed away from the valve seat by sliding in the direction against the acting force based on the fluid pressure from the load flow path acting on the back of the poppet valve body, and the flow flows from the load flow path to the supply/discharge flow path. In order to obtain a controlled flow, a pilot piston is fitted into the valve hole so that it can freely slide in the axial direction from the valve seat toward the opening of the supply/discharge passage, and is provided so that it can freely come into contact with the head of the poppet valve body, and a load is placed on the back of the poppet valve body. In order for the acting force based on the fluid pressure from the flow path to act on the back of the poppet valve body, the poppet valve body, the valve hole, and the valve body form an action chamber into which the fluid in the load flow path is introduced, and A pilot-operated check valve in which the action chamber for introducing fluid is formed by mutually fitting a recess and a protrusion formed opposite to each other on the back of the poppet valve body and the valve body to reduce the area of action on the back of the poppet valve body.