CN86103677A

CN86103677A - Air isolating valve used for anti-pollution purpose

Info

Publication number: CN86103677A
Application number: CN198686103677A
Authority: CN
Inventors: 王彭龄; 苏恩远; 贾树学
Original assignee: SHENYANG WATER AND HEATING EQUIPMENT FACTORY
Current assignee: SHENYANG WATER AND HEATING EQUIPMENT FACTORY
Priority date: 1986-06-03
Filing date: 1986-06-03
Publication date: 1987-12-16

Abstract

What the present invention relates to is a kind of protection potable water pipeline, the safety and sanitary device that makes it avoid polluting.This device is made up of a liquid operated globe valve, a drain valve and the safety check with the liquid operated globe valve interlock.When causing the pipeline generation to push back stream by various reasons, liquid operated globe valve and safety check are just closed, the drain valve of while and liquid operated globe valve interlock is with the water emptying between liquid operated globe valve and the safety check, form an air and cut off the chamber, purified water and contaminated water are separated, to eliminate the drinking-water pipe route in falling to press the pollution problem that causes.

Description

Air isolating valve used for anti-pollution purpose

In public supply mains, frequent and some the nonpotable water pipeline cross-join of potable water pipeline.As connecting with water pipelines such as factory, building site, hospitals, like this owing to some undesired reasons, as the right step-down of water supply distal process, or the waterexit end boosts suddenly, often causes the refluence phenomenon, makes urban drinking water pipe network part, even all faces the danger of pollution.NORTHWEST CHINA industrial design institute just provides: NJ USA makes the survey report that suspend in plant downtime, airport, thousands of people is in hospital because industry water blows back into potable water network and pollutes.Pour in down a chimney pollution problems and attract great attention abroad, some advanced industrial countries all have corresponding regulations, have special factory to make corresponding apparatus.As: U. S. Patent 3936968,3747621,3906987,4332274; B. P. 2017262,2102918 etc. all is this class device.U. S. Patent: 3936968,3,906,987 two patents by U.S. Watts regulator company (WATTS, REGULATOR, COMPA И Y) as approved product production.But above-mentioned patent all is the counter-flow-preventing device of decompression type, and promptly when the adverse current phenomenon took place, a floss hole of this device was opened automatically, outside the current discharge conduit that will pour in down a chimney.Outdoor and the 96th and the 13rd regulation of indoor water supply and drainage design code of China: ... when producing alternate source, two kinds of pipeline junctions should take to prevent the measure of water pollution with Drinking Water ...Therefore above-mentioned decompression type counter-flow-preventing device all can not satisfy the requirement of China's design code.Purpose of the present invention just provides and a kind ofly can satisfy that China plumbing design code requires, the safety and sanitary device that safe and reliable potable water pipeline is used.

Please referring to accompanying drawing 1.This device is made up of the drain valve B and the safety check C of liquid operated globe valve A and liquid operated globe valve interlock.Please referring to accompanying drawing 2.This figure is liquid operated globe valve A and drain valve B combination, and liquid operated globe valve is made up of major parts such as valve body 7, valve seat 10, rubber cushion 11, small piston 12, hollow coupking shaft 15, lining 20, oil hydraulic cylinder 24, big piston 25, hydraulic cylinders 31.Rubber cushion 11 usefulness locknuts 9 are screwed on the small piston body 12.Small piston 12 forms active chamber E by cushion rubber 16, " zero " shape seal ring 17 and 37.Cushion rubber 16 by means of pressing plate 19, dunnage 18, be clipped on the small piston body 12, big piston 25 formed active chamber F and G by cushion rubber 26, " zero " shape seal ring 36.Cushion rubber 26 is fastened on the big piston body 25 by dunnage 27 usefulness pressing plates 29 and screw.Big piston body 25 and small piston 12 usefulness locknuts 13,14,68 are fastened on the hollow coupking shaft 15.Active chamber F is communicated with import by the center hole 70 and the hole 69 of hollow coupking shaft 15.Active chamber E and G are communicated with the H and the i of outlet end respectively by pipeline 41,71.Drain valve B is made up of major parts such as connecting rod 1, adjusting nut 67, cushion rubber bumper 66, valve seat 65, sealing gasket 64, valve seat 5, " zero " shape seal ring 63, passage 72 and cases 2.When drain valve was in Fig. 1 position, the water of intermediate cavity D can be by passage 72 outside the drain valve discharge conduit.Drain valve B and liquid operated globe valve A link, when the small piston 12 that plays the flap effect when liquid operated globe valve rises fully, locking plate 8 is just mentioned connecting rod 1, the sealing gasket 64 of drain valve B just abuts against on the valve seat 5 and keeps sealing state, when the small piston 12 that plays the flap effect when liquid operated globe valve is in Fig. 1 position, be the stop valve upper end that the lower end of hollow shaft 15 just promotes connecting rod 1 when being in sealing state, the seal rubber pad 64 of drain valve B is pushed away valve seat 6, make drain valve B be in opening state.Please referring to accompanying drawing 3.Form by valve body 47,55 safety check C, valve seat 48, " zero " shape seal ring 50, seal rubber pad 51, dunnage 52, pressing plate 53, " zero " shape seal ring 56, the axis of guide 58, spring 57, spring seat 59 and locknut 55 etc.Safety check C only allows water to flow to outlet from import, otherwise then closes automatically.

The working principle of this device is as follows: when water when import flows to outlet, water will enter active chamber F by the center hole 70 of hole 69 and hollow shaft 15.The hydraulic pressure of import will act on the lower end area of small piston 12 and big piston 25.At this moment because of active chamber E and C communicate with outlet end owing to the pressure drop effect of valve itself, the pressure of outlet end must be lower than entrance point pressure.Be that big small piston upper end will be less than the active force of big small piston lower end from import hydraulic pressure from the active force of outlet hydraulic pressure, at this moment resultant direction makes progress, and promotes big small piston and rise together.Stop valve A is in full-gear, and drain valve B is in the closed condition of sealing simultaneously.Water flows into the D chamber by import, pushes safety check C open and flows to outlet.When overwhelming the stream situation by certain reason generation, because of the upper end active chamber GE of big small piston communicates with outlet end: top stressed will be greater than following stressed, resultant direction is downward, at this moment safety check B and liquid operated globe valve A will close, and drain valve B opens automatically the water among the D of confined area is given off formation air partition chamber outside the pipeline simultaneously.44 is one-way valves, and it will be closed during greater than atmospheric pressure when the pressure in the pipeline, and it will be opened when the pressure in the pipeline is lower than atmospheric pressure, and allow air to enter pipeline.The purpose that this valve is set is that air can enter in the pipeline during for drain valve B draining, so that draining smoothly forms air and cuts off state.

Claims

1, a kind of prevent the drinking-water pipe route in pressing adverse current contaminated safety and sanitary device, form by a liquid operated globe valve A, one and drain valve B and a safety check C of liquid operated globe valve A interlock.When water flowed to outlet by import normally, liquid operated globe valve A and safety check C opened automatically by the differential pressure action of import and outlet, and drain valve B is in closed condition, and water flows to outlet freely.When outlet end pressure had adverse current dangerous greater than entrance point, safety check C and liquid operated globe valve A closed automatically by the differential pressure action of export and import, and drain valve B opens automatically the water among the enclosed cavity D is discharged simultaneously, forms the safety protection state that air cuts off.

2, claim 1 said liquid operated globe valve A is made up of major parts such as valve body 7, valve seat 10, lining 20, small piston 12, hollow coupling shaft 15, big piston 25, oil hydraulic cylinder 24, hydraulic cylinder 31 and seal ring 16,24, " zero " shape seal rings 17,37,36.The lower end of big piston, small piston communicates with water intake respectively; The upper end of big piston, small piston communicates with outlet respectively.

3, claim 1 said drain valve B is made up of connecting rod 1, adjusting nut 67, cushion rubber bumper 66, valve seat 65, sealing gasket 64, passage 72, valve seat 5, " zero " shape seal ring 63 and case 2 etc.; Drain valve B is by connecting rod 1, locking plate 8, locknut 9 12 active connections of small piston with liquid operated globe valve.