JPH0325080U

JPH0325080U -

Info

Publication number: JPH0325080U
Application number: JP8625689U
Authority: JP
Priority date: 1989-07-21
Filing date: 1989-07-21
Publication date: 1991-03-14
Anticipated expiration: 2004-06-01
Also published as: JPH0620939Y2

Description

[Brief explanation of the drawing]

第１図ないし第３図は本考案の一実施例を示し
たもので、第１図はパイロツト操作逆止め弁を縦
断面図にして示した流体回路図、第２図、第３図
はそれぞれパイロツト操作逆止め弁の作動状態図
、第４図は従来例を示した図である。１……弁本体、４……給排流路、６……負荷流
路、７……流体アクチユエータ、８……弁座、９
……ポペツト弁体、９Ｂ……嵌挿孔、１２……流
量調整部材、１３……パイロツトピストン、１３
Ａ……突出部。 Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a fluid circuit diagram showing a vertical sectional view of a pilot operated check valve, and Figures 2 and 3 are respectively FIG. 4 is a diagram illustrating the operating state of a pilot-operated check valve, showing a conventional example. DESCRIPTION OF SYMBOLS 1... Valve body, 4... Supply/discharge channel, 6... Load channel, 7... Fluid actuator, 8... Valve seat, 9
... Poppet valve body, 9B ... Fitting hole, 12 ... Flow rate adjustment member, 13 ... Pilot piston, 13
A... Protrusion.

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 flow passage opening side so as to separate from the valve seat and obtain a free flow, and receives the acting force based on the pilot fluid pressure. It slides in the axial direction and presses the poppet valve body against the acting force based on the fluid pressure from the load flow path acting on the back of the poppet valve body to separate from the valve seat and flow from the load flow path to the supply/discharge flow path. In order to obtain a controlled flow, a pilot piston having a protrusion that can freely come into contact with the head of the poppet valve body is fitted into the valve hole so as to be slidable in the axial direction from the valve seat toward the opening of the supply/discharge passage. A flow rate adjusting member is fitted into a fitting hole extending axially through the body, facing the protruding part of the pilot piston so that it can move forward and backward in the axial direction, and the head is pressed by the protruding part of the pilot piston, and the flow rate adjusting member is inserted from the valve seat. A pilot-operated check valve comprising a protrusion of a pilot piston so as to be able to come into contact with a flow rate adjusting member so as to adjust the axial opening amount of a poppet valve body that is separated from the seat.