CN201221628Y

CN201221628Y - Backflow preventer

Info

Publication number: CN201221628Y
Application number: CNU2008201507545U
Authority: CN
Inventors: 季能平
Original assignee: SHANGHAI SHANGLONG VALVE FACTORY
Current assignee: SHANGHAI SHANGLONG VALVE FACTORY
Priority date: 2008-07-11
Filing date: 2008-07-11
Publication date: 2009-04-15
Anticipated expiration: 2018-07-11

Abstract

The utility model discloses a backflow preventer, which is characterized in that a valve body is in an X-shape, the four ends of the valve body are respectively provided with a water inlet, a water outlet, a liquid control port and an inspection operation port. A valve seat is respectively fixed on the water inlet and the water inlet. A guide sleeve is fixed on the liquid control port. A first-stage seal is arranged between the valve seat on the water inlet and the guide sleeve on the liquid control port. A second-stage seal is arranged on the valve seat on the water outlet. The inspection operation port, two regulation and control ports and a drainer port are arranged on the valve body and between the water inlet and the water outlet. Guiding grooves are arranged in the valve body and between the water outlet and the liquid control port. The utility model has small forward direction circulating resistance, good effect of backflow prevention, simple manufacturing and installation and convenient maintenance.

Description

A kind of backflow preventer

Technical field

The utility model relates to the control gear of water pipe pipe network, especially a kind of backflow preventer.

Background technique

Backflow preventer is the double non-return valve of the anti-backflow of a kind of strictness, usually on the connecting tube between Drinking Water pipeline and the non-Drinking Water pipeline, install, mainly protect the water quality safety of its front end Drinking Water, avoid the backflow pollution of the non-Drinking Water in rear end; Its structure of backflow preventer of the prior art mostly is " one " font and two " Y " type; " one " font, be that water intake, water outlet, primary seal, secondary seal are arranged on an axis, the problem of existence is: 1. maintenance difficult must disassemble valve body during maintenance from pipeline, can carry out maintain and replace to the component in the valve body, maintenance load is big; Two " Y " type, be that water intake and primary seal are " Y " type check device, water outlet and secondary seal are another " Y " type check device, there is not primary seal hydraulic control induction installation, primary seal only relies on spring that sealing force is provided, the problem that exists is: the spring that 1. must select big hardness for use, could guarantee sealing reliability, cause that the forward circulating resistance is bigger, 2. because the elastic force decay takes place in spring easily, service time, long slightly causing easily leaked, and 3. volume is bigger, and manufacturing and installation cost are higher.

Summary of the invention

The purpose of this utility model is a kind of backflow preventer that provides at the deficiencies in the prior art, and its forward circulating resistance is little, and is easy to maintenance, and antileaking prevents the effective of backflow pollution, installs simple.

The concrete technological scheme that realizes the utility model purpose is:

A kind of backflow preventer, characteristics are that valve body is " X " shape, and its four end is respectively water intake, water outlet, hydraulic control mouth, access hole; Be fixed with valve seat on water intake, the water outlet respectively, be fixed with guide pin bushing on the hydraulic control mouth; Be provided with primary seal between the guide pin bushing on valve seat on the water intake and the hydraulic control mouth; Valve seat on the water outlet is provided with secondary seal; Be provided with inspection socket, two regulation and control mouths, hydathode interface on the valve body and between water intake and the water outlet, be provided with guiding gutter in the valve body and between water outlet and the hydraulic control mouth.

Described primary seal is made up of valve seat, flap, guide rod, piston; Flap, piston are located at the two ends of guide rod respectively.

Described hydraulic control mouth is provided with end cap, is provided with spring between end cap and the piston.

Described secondary seal is made up of valve seat, flap, guide rod; Guide rod is fixedlyed connected with valve seat, and flap is set on the guide rod, and guide rod is provided with spring seat, is provided with spring between spring seat and the flap.

Described access hole is provided with end cap, and end cap is provided with peep hole.

The utility model compact structure, the forward opening resistance is little, and antileaking is easy to maintenance, prevents the effective of backflow pollution, installs simple.

Description of drawings

Fig. 1 is the utility model structural representation

Fig. 2 is the utility model user mode schematic representation

Embodiment

Consult Fig. 1, the utility model valve body 1 is " X " shape, and its four end is respectively water intake 11, water outlet 12, hydraulic control mouth 13, access hole 14, is respectively equipped with

end cap

27,29 on hydraulic control mouth 13, the access hole 14, is fixed with guide pin bushing 17 on the hydraulic control mouth 13; Be provided with primary seal 3 between valve seat 15 on the water intake 11 and the guide pin bushing 17 on the hydraulic control mouth 13; The valve seat 16 of water outlet 12 is provided with secondary seal 4; Be provided with inspection socket 24, regulation and

control mouth

21,22, hydathode interface 25 on the valve body 1 and between water intake 11 and the water outlet 12, be provided with guiding gutter 26 in the valve body 1 and between water outlet 12 and the hydraulic control mouth 13; Primary seal 3 is made up of valve seat 15, flap 31, guide rod 38, piston 33, and flap 31, piston 33 are fixedlyed connected with the two ends of guide rod 38 respectively; Secondary seal 4 is made up of valve seat 16, flap 41, guide rod 49, and guide rod 49 is fixedlyed connected with valve seat 16, and flap 41 is set on the guide rod 49, and guide rod 49 the other ends are provided with spring seat 43, is provided with spring 44 between spring seat 43 and the flap 41; Be provided with spring 28 between end cap 27 and the piston 33; Access hole 14 is provided with end cap 29, and end cap 29 is provided with peep hole.

Consult Fig. 2, when the utility model uses, connect hydathode 2 on hydathode interface 25, regulation and

control mouthfuls

21,22 are communicated with hydathode 2; When the medium forward flow, be the pressure of the pressure of water intake 11 greater than water outlet 12, at this moment, inlet pressure, outlet pressure is through regulation and

control mouth

21,22 enter hydathode 2, hydathode interface 25 is closed, pressure medium is entered by water intake 11 through pipeline, overcome the resistance of spring 28, promote flap 31, guide rod 38, piston 33 moves to hydraulic control mouth 13 directions, at this moment, flap 31 separates with valve seat 15, makes pressure medium enter intermediate cavity 214, simultaneously, piston 33 promotes liquid controling cavity 213 interior media and flows to water outlet 12 from guiding gutter 26, and the pressure mediums in the intermediate cavity 214 overcome the resistance of spring 44, promote flap 41 and outwards move along guide rod 49, at this moment, flap 41 separates with valve seat 16, makes the pressure medium flow inlet/outlet chamber 212 in the intermediate cavity 214, flows into downstream line through water outlet 12, realize the circulation of medium forward, hydathode 2 cuts out water-tight simultaneously; Otherwise, when the pressure medium of water outlet 12 during greater than the pressure of water intake 11, medium is in reflux state, the pressure medium of water outlet 12 enters hydathode 2 through regulation and control mouth 22, hydathode interface 25 is opened to communicate with atmosphere, at this moment, pressure in the intermediate cavity 214 reduces rapidly, and equate with barometric pressure, simultaneously, pressure medium in the water outlet 12 promotes flap 41 and draws close to valve seat 16 rapidly along guide rod 49, secondary seal 4 selfsealings are closed, stop the outlet medium to flow to intermediate cavity, simultaneously, pressure medium in the water outlet 12 passes to liquid controling cavity 213 through guiding gutter 26, promote piston 33, guide rod 38, flap 31 moves to valve seat 15 fast, make primary seal 3 hermetically closings, stop the pressure medium in the entrance point 11 to flow to intermediate cavity 214, at this moment, form the low pressure that pressure in the intermediate cavity 214 all are lower than snout cavity 211 pressure and outlet plenum 212 pressure and cut off effect, in case primary seal 3 takes place, the seal failure at position such as between secondary seal 4 or piston 33 and the guide pin bushing 17, and the generation seepage, leak the intermediate cavity 214 that medium all can flow to low pressure, and process hydathode interface 25 reaches hydathode 2 quick the outflows outside the valves of having opened, the medium back flow at water outlet 12 places prevents the backflow pollution purpose to the possibility of water intake 11 thereby reach when having avoided valve seal to lose efficacy; During backflow, utilize the piston 33 on the primary seal 3, induce the high pressure at the mouth of a river 12, overcome the active force of low pressure on primary seal 3 flaps 31 of water intake 11, seal action power directly is provided for primary seal 3, not only sealing is reliable, and has reduced the hardness of primary seal 3 upper reset springs significantly, the resistance when having reduced the forward circulation effectively; When refluxing, because the pressure in the intermediate cavity 214 is barometric pressure, realized that atmosphere cuts off purpose, it cuts off reliability and increases substantially than existing decompression principle type backflow preventer.

The utility model is when maintenance, as long as open end cap 27 on the hydraulic control mouth 13 and the end cap 29 on the access hole 14, be all component enforcement maintenances in the detachable valve body 1, only need open peep hole on the end cap 29 at ordinary times and can remove the rubbish of

flap

15,16 sealed mouths, need not valve body 1 is pulled down from pipeline, realize online maintenance purpose.

Claims

1, a kind of backflow preventer is characterized in that valve body (1) is " X " shape, and its four end is respectively water intake (11), water outlet (12), hydraulic control mouth (13), access hole (14); Be fixed with valve seat (15), (16) respectively on water intake (11), the water outlet (12), be fixed with guide pin bushing (17) on the hydraulic control mouth (13); Be provided with primary seal (3) between valve seat (15) on the water intake (11) and the guide pin bushing (17) on the hydraulic control mouth; Valve seat (16) on the water outlet (12) is provided with secondary seal (4); Be provided with inspection socket (24), regulation and control mouthful (21), (22), hydathode interface (25) on the valve body (1) and between water intake (11) and the water outlet (12), be provided with guiding gutter (26) in the valve body (1) and between water outlet (12) and the hydraulic control mouth (13).

2, backflow preventer according to claim 1 is characterized in that described primary seal (3) is made up of valve seat (15), flap (31), guide rod (38), piston (33); Flap (31), piston (33) are located at the two ends of guide rod (38) respectively.

3, backflow preventer according to claim 1 is characterized in that described hydraulic control mouth (13) is provided with end cap (27), is provided with spring (28) between end cap (27) and the piston (33).

4, backflow preventer according to claim 1 is characterized in that described secondary seal (4) is made up of valve seat (16), flap (41), guide rod (49); Guide rod (49) is fixedlyed connected with valve seat (16), and flap (41) is set on the guide rod (49), and guide rod (49) is provided with spring seat (43), is provided with spring (44) between spring seat (43) and the flap (41).

5, backflow preventer according to claim 1 is characterized in that described access hole (14) is provided with end cap (29), and end cap (29) is provided with peep hole.