CN201615267U

CN201615267U - Pilot overflow valve

Info

Publication number: CN201615267U
Application number: CN2009202986490U
Authority: CN
Inventors: 刘韶林; 陈贵文; 刘玉; 张韩平
Original assignee: CHENGDU WEILISHENG BIOTECH Co Ltd
Current assignee: CHENGDU WEILISHENG BIOTECH Co Ltd
Priority date: 2009-12-30
Filing date: 2009-12-30
Publication date: 2010-10-27
Anticipated expiration: 2019-12-30

Abstract

The utility model relates to a pilot overflow valve, which comprises a main valve and a pilot valve fixed on the main valve, and is characterized in that the main valve mainly comprises a main valve body, a main valve seat, a main valve core and a main valve spring; the pilot valve mainly comprises a pilot valve assembly, a pilot valve spring and a pilot valve body; the pilot valve is fixed on the main valve through four screws; the pilot valve assembly is mounted in the pilot valve body; a stationary liquid resistance R1 is arranged on the main valve; one end of the pilot valve seat adopts a miter valve port, the middle part thereof adopts a piston hole, and the other end thereof is provided with a plug; a control piston is further included in the pilot overflow valve, and separated from a pilot miter valve; the control piston can freely move in the piston hole of the pilot valve seat; a radial hole is formed on the control piston, and a stationary liquid resistance R2 is mounted in the radial hole; and the pilot miter valve is mounted in the miter valve port of the pilot valve seat. The utility model solves the problem of the prior art that the processing requires much effort, and has the advantages of simple structure and the like.

Description

A kind of pilot operated compound relief valve

Technology neck city

The utility model relates to a kind of pilot operated compound relief valve.

Background technique

Its structure of the pilot operated compound relief valve of using often at present is that cone valve and piston are integral structure, this structural design makes piston and cone valve two-stage be strict with concentric man-hour adding, increased technology difficulty, incorporate in addition structure causes the runner more complicated of pilot valve, and the height of pilot valve is also higher.Provide another kind of pilot operated compound relief valve in order to address the above problem the utility model at this.

The model utility content

The purpose of this utility model is to provide a kind of difficulty of processing little, simple in structure pilot operated compound relief valve.

The purpose of this utility model is achieved in that a kind of pilot operated compound relief valve of structure, it comprises main valve and is fixed on pilot valve on the main valve, it is characterized in that: main valve mainly comprises main valve body, main valve seat, main valve plug and main spool spring, pilot valve mainly comprises the pilot valve assembly, pilot valve spring and guide's valve body, wherein pilot valve is fixed on the main valve with four screws, the pilot valve assembly is installed in guide's valve body, and there is fixer to hinder R1 on the main valve, one end of guide's valve seat is the cone valve mouth, the middle part is a piston hole, the other end is provided with plug, also comprises control piston, and control piston and pilot poppet valve are separation structure, control piston can unrestricted motion in the piston hole of guide valve seat, open radial hole on the control piston, its inside is equipped with fixer resistance R2, and pilot poppet valve is installed in the cone valve mouth of guide's valve seat.

According to a kind of pilot operated compound relief valve described in the utility model, the cone valve head that it is characterized in that described pilot poppet valve is a cylindrical structure.

1., pilot poppet valve and piston be separation structure advantage of the present utility model is:, thereby avoided piston and the strict concentric processing technology requirement of cone valve two-stage, the technology capability of the utility model pilot valve is good, and quality of product is guaranteed easily.2., fixer resistance R2 is directly installed on the piston middle part, the runner of the utility model pilot valve is simplified, and has reduced the height of pilot valve.3., pilot valve technology for assembling of the prior art is relatively poor, before the pilot valve assembled, its piston is wanted to unload from poppet valve core earlier, and cone valve is inserted guide's valve seat from the right, piston is inserted on the guiding awl of cone valve from the left side, bore in the guiding of cone valve with nut check.The cone valve of the utility model relief valve, piston are separation structure, and be easy for installation.4., the utility model pilot operated compound relief valve and the background technique guide loop of being adopted all is G type 7T bridge liquid resistance networks, its stable state override pressure is almost nil, but because the pilot valve structure of the utility model pilot operated compound relief valve is simpler, its technology capability is good, technical performance guarantees easily, thereby the better application prospect is arranged.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model overall structure schematic representation;

Fig. 3 is the utility model working principle schematic representation;

Embodiment

As Figure 1-3, the utility model pilot operated compound relief valve is made up of main valve and pilot valve, and main valve mainly comprises main valve body 1, main valve seat 2, main valve plug 3 and main spool spring 4, and pilot valve mainly comprises pilot valve assembly 5, pilot valve spring 6 and guide's valve body 7.Pilot valve is positioned at above the main valve, with four screws pilot valve is fixed on the main valve, and the main valve structure is identical with existing relief valve main valve.The pilot valve assembly is installed in guide's valve body 7, its structure as shown in Figure 2, the pilot valve assembly is by preventing that piston from skidding off the plug 8 of guide's valve seat, control piston 9, the fixer resistance R2, guide's valve seat 10 and the pilot poppet valve 11 that are fixed in the piston with screw thread are formed.Control piston 9 formerly can be free to slide in the guide valve seat 10, and guide's valve seat is fixed in guide's valve body 7 with circlip.As shown in Figure 1 and Figure 2, guide's valve seat 10 1 ends of the utility model pilot operated compound relief valve are the cone valve mouth, the middle part is a piston hole, the other end is fixed with plug 8, and control piston 9 is a separation structure with pilot poppet valve 11, and control piston 9 is the interior unrestricted motion of piston hole of guide valve seat 10 formerly, open radial hole on the control piston 9, its inside is equipped with fixer resistance R2, and pilot poppet valve 11 is installed in the cone valve mouth of guide's valve seat 10, and the cone valve head of described pilot poppet valve 11 is a cylindrical structure.The working principle of this valve as shown in Figure 3, the guide loop is made of the resistance of 3 liquid R1, R2, R3, wherein R1 is arranged on the main valve side, R2 is arranged on the inside of control piston 9, R1 and R2 are the fixer resistance, and the valve port between pilot poppet valve 11 and the guide's valve seat 10 is R3, and R3 is variable liquid resistance.The control piston of this valve is subjected to two pressure P 2 and the P3 effect before and after the liquid resistance R2, because P2＞P3, so an end of control piston 9 and pilot poppet valve 11 conehead ends are against contacting, the thrust of the controlled piston 9 of pilot poppet valve n, the pilot valve spring force, steady-state fluid force control, this relief valve working principle is as follows: when pilot valve is not opened, liquid resistance R1 and R2 do not have fluid to flow through, P1=P2=P3, when P1 rises, when making the hydraulic coupling that acts on pilot poppet valve 11 left sides reach the pilot valve spring force, pilot valve is opened, fluid passes through R1, R2 and pilot poppet valve mouth flow back to fuel tank, this moment P1＞P2＞P3, control piston 9 contact with pilot poppet valve 11, the thrust that acts on the control piston 9 is passed through pilot valve spring force realization balance.When pressure differential deltap P=P1 one P3 reaches certain value, main valve open, most of flow makes the valve inlet pressure controlled from the primary valve overflow.

Claims

1. pilot operated compound relief valve, it comprises main valve and is fixed on pilot valve on the main valve, it is characterized in that: main valve mainly comprises main valve body (1), main valve seat (2), main valve plug (3) and main spool spring (4), pilot valve mainly comprises pilot valve assembly (5), pilot valve spring (6) and guide's valve body (7), wherein pilot valve is fixed on the main valve with four screws, guide's valve body is equipped with the pilot valve assembly in (7), and there is fixer to hinder R1 on the main valve, one end of guide's valve seat (10) is the cone valve mouth, the middle part is a piston hole, the other end is provided with plug (8), also comprise control piston (9), control piston (9) is a separation structure with pilot poppet valve (11), control piston (9) can unrestricted motion in the piston hole of guide valve seat (10), control piston is opened radial hole on (9), and its inside is equipped with fixer resistance R2, and pilot poppet valve (11) is installed in the cone valve mouth of guide's valve seat (10).

2. a kind of pilot operated compound relief valve according to claim 1, the cone valve head that it is characterized in that described pilot poppet valve (11) is a cylindrical structure.