CN201547046U

CN201547046U - Pilot operated one-way valve

Info

Publication number: CN201547046U
Application number: CN2009202004035U
Authority: CN
Inventors: 应永华; 陈海斌
Original assignee: NINGBO CHANGBI LIQUID CONNECTOR CO Ltd
Current assignee: Ningbo Long Wall Fluid Kinetic Sci-Tech Co., Ltd.
Priority date: 2009-11-18
Filing date: 2009-11-18
Publication date: 2010-08-11
Anticipated expiration: 2019-11-18

Abstract

The utility model discloses a pilot operated one-way valve, comprising a valve body, a guide valve, a valve seat and a valve sleeve which are all sealed inside the valve body. The valve seat is arranged between the guide valve and the valve sleeve, a valve core is arranged inside the guide valve, and the end part of the valve core abuts onto the valve seat. A piston is sealed inside the valve sleeve, the end part of the piston passes into the valve seat to be opposite to the front end of the valve core, and a first spring abuts between the piston and the end face of the valve seat. The valve body is provided with at least a first connector, a second connector and a third connector, wherein the first connector is communicated with the guide valve, the second connector is communicated with the valve seat, and the third connector is communicated with the valve sleeve. The pilot operated one-way valve is characterized in that a pre-decompressing unit is arranged inside the valve core. The utility model has the advantages that the pilot operated one-way valve reduces impact force of hydraulic pressure to subsequent connection members while starting because the pre-decompressing unit is arranged inside the valve core, therefore the subsequent connection members are more stable to start and reset, and hydraulic pressure for starting the subsequent connection members are reduced.

Description

A kind of Pilot operated check valve

Technical field

The utility model relates to a kind of valve, relates in particular to a kind of Pilot operated check valve.

Background technique

Pilot operated check valve is a kind of parts that are widely used in lathe, engineering machinery, boats and ships and the military industrial technology equipment, and it can make hydraulic pressure allow reverse flow after unlatching, and this type of one-way valve is mainly used in the isolation of oil hydraulic circuit part.During Pilot operated check valve work, rely on the pressure of hydraulic pressure to push the spool that withstands on the valve seat earlier open, promote to be connected the subsequent parts motion on the fluid-control one-way valve outlet port then, when subsequent parts will reset, utilize the piston in the valve body to push the spool that withstands on the valve seat open, thereby make the liquid return that promotes subsequent parts that subsequent parts is resetted, but present Pilot operated check valve (pushing spool open in a flash) when starting is bigger to the impact force of subsequent parts, make the startup instability of subsequent parts, and needed hydraulic pressure (power) is bigger when starting.

Summary of the invention

Technical problem to be solved in the utility model is a kind of little to the impact force of follow-up link when starting, and the smaller Pilot operated check valve of required hydraulic pressure.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: a kind of Pilot operated check valve, comprise that valve body and sealing are arranged on the pilot valve in the described valve body, valve seat and valve pocket, described valve seat is arranged between described pilot valve and the described valve pocket, be provided with spool in the described pilot valve, the end apical grafting of described spool is on described valve seat, sealing is provided with piston in the described valve pocket, the end of described piston penetrates in the described valve seat relative with the front end of described spool, apical grafting has first spring between the end face of described piston and described valve seat, be respectively arranged with first interface of at least one on the described valve body, second interface and the 3rd interface, described first interface is connected with described pilot valve, described second interface is connected with described valve seat, described the 3rd interface is connected with described valve pocket, is provided with pre-decompressor in the described spool.

Described pre-decompressor comprises auxiliary spool and the auxiliary valve seat that is arranged in the described spool, the front end that the front end of described auxiliary spool stretches out described spool is relative with described piston, and apical grafting has second spring between the rear end of described auxiliary spool and the interior edge face of described pilot valve.

The distance that the front end end face of described auxiliary spool exceeds the front end end face of described spool is 0.9-1.3mm.

Described pilot valve is provided with pressure reducing sleeve.

Compared with prior art, the utility model has the advantages that owing to be provided with pre-decompressor in the spool, the front end of auxiliary spool stretches out spool, when Pilot operated check valve is worked, the liquid that flows into valve seat by second interface is pushed auxiliary spool earlier open, allow a part of liquid flow to pilot valve from auxiliary spool earlier and flow to first interface again, the follow-up link that promotes earlier to be connected on first interface slowly starts, when the front-end face of auxiliary spool flushes with the front-end face of spool, liquid is pushed spool open and is flow to pilot valve from spool and flow to first interface again, thereby promoting follow-up link normally starts, when liquid will reflux (when follow-up link will reset), promote pistons work by feeding liquid at the 3rd interface, the process that piston promotes spool is identical with said process, this process has reduced when starting hydraulic pressure to the impact force of follow-up link, make the startup of follow-up link and reset more steady, and needed hydraulic pressure when having reduced startup.

Description of drawings

Fig. 1 is a whole linkage structure schematic representation of the present utility model;

Fig. 2 is the structural representation of pilot valve of the present utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in the figure, a kind of Pilot operated check valve, comprise that valve body 1 and sealing are arranged on the pilot valve 2 in the valve body 1, valve seat 3 and valve pocket 4, valve seat 3 is arranged between pilot valve 2 and the valve pocket 4, be provided with spool 5 in the pilot valve 2, the end apical grafting of spool 5 is on valve seat 3, be provided with auxiliary spool 51 and auxiliary valve seat 52 in the spool 5, the front end of auxiliary spool 51 stretches out the front end of spool 5, the distance that the front end end face of auxiliary spool 51 exceeds the front end end face of spool 5 is 1mm, apical grafting has second spring 8 between the interior edge face of the rear end of auxiliary spool 51 and pilot valve 2, sealing is provided with piston 6 in the valve pocket 4, the end of piston 6 penetrates in the valve seat 3 relative with the front end of spool 5, and apical grafting has first spring 7 between the end face of piston 6 and valve seat 3, and valve body 1 is provided with three first interface A, two second interface PA and three the 3rd interface PB, first interface 11 is connected with pilot valve 2, second interface 12 is connected with valve seat 3, and the 3rd interface 13 is connected with valve pocket 4, and pilot valve 2 is provided with pressure reducing sleeve 22.

In the foregoing description, the front end end face of auxiliary spool 51 exceed the distance of the front end end face of spool 5 can be in the scope of 0.9-1.3mm value arbitrarily, the quantity of the first interface A, the second interface PA and the 3rd interface PB can also can be one for a plurality of.

Claims

1. Pilot operated check valve, comprise that valve body and sealing are arranged on the pilot valve in the described valve body, valve seat and valve pocket, described valve seat is arranged between described pilot valve and the described valve pocket, be provided with spool in the described pilot valve, the end apical grafting of described spool is on described valve seat, sealing is provided with piston in the described valve pocket, the end of described piston penetrates in the described valve seat relative with the front end of described spool, apical grafting has first spring between the end face of described piston and described valve seat, be respectively arranged with first interface of at least one on the described valve body, second interface and the 3rd interface, described first interface is connected with described pilot valve, described second interface is connected with described valve seat, described the 3rd interface is connected with described valve pocket, it is characterized in that being provided with in the described spool pre-decompressor.

2. a kind of Pilot operated check valve as claimed in claim 1, it is characterized in that described pre-decompressor comprises auxiliary spool and the auxiliary valve seat that is arranged in the described spool, the front end that the front end of described auxiliary spool stretches out described spool is relative with described piston, and apical grafting has second spring between the rear end of described auxiliary spool and the interior edge face of described pilot valve.

3. a kind of Pilot operated check valve as claimed in claim 2, the distance that the front end end face that it is characterized in that described auxiliary spool exceeds the front end end face of described spool is 0.9-1.3mm.

4. a kind of Pilot operated check valve as claimed in claim 1 is characterized in that described pilot valve is provided with pressure reducing sleeve.