CN2381857Y

CN2381857Y - Liquid backflow preventor

Info

Publication number: CN2381857Y
Application number: CN 99241906
Authority: CN
Inventors: 穆秋池
Original assignee: RONGYANG TECHNOLOGY INST BEIJING
Current assignee: RONGYANG TECHNOLOGY INST BEIJING
Priority date: 1999-08-17
Filing date: 1999-08-17
Publication date: 2000-06-07
Anticipated expiration: 2009-08-17

Abstract

The utility model relates to a liquid backflow preventer. In the utility model, the lower part of a valve body is provided with a valve seat, a valve clack is perpendicular to a valve stem, the lower side of the valve seat is connected with a nozzle of a backflow-water discharging pipe, and the upper part of the valve body is fixedly provided with a diaphragm seat ring which is provided with an elastic diaphragm supported by the vertical valve stem; a water inflow one-way valve connected with a water inflow pipe segment and a water outflow one-way valve connected with a water outflow pipe segment are arranged on the side wall of the valve body, a communicating pipe is arranged between a water chamber with pressure formed above the diaphragm and the upper stream of the water inflow one-way valve. The utility model has the advantages that once the phenomenon of the backflow of water in a pipe network appears, backflow water can be discharged out of a pipeline system in time, so the backflow water is absolutely prevented from polluting the pipe network system; the liquid backflow preventer has compact structure, and is convenient for assembling and disassembling. The utility model is suitable for preventing the backflow water from flowing backwards in a water-supply network.

Description

The liquid countercurrent preventer

The utility model belongs to valve, particularly a kind of valving that prevents that in pipe-line system liquid from flowing backwards.

At present, the various check valve of using in water supply system are in order to prevent the aqueous reflux in the pipe network, still, in case the flap Sealing is impaired, the refluence of water will to take place, polluting water supply network.If drink feedwater, then can bring harmful effect to health.

The purpose of this utility model is, design and produce a kind of liquid countercurrent preventer, utilize the combination of diaphragm apparatus and one-way cock, in a single day for the aqueous reflux phenomenon that occurs in the pipe network, in time with the backwater offtake piping system that flows backwards, thereby avoid the backflow pollution pipe network system, guarantee drinking water quality health and safety.

The technical solution of the utility model is following realization: a kind of liquid countercurrent preventer, comprise valve body, valve seat, valve rod, flap, in valve body lower portion valve seat is set, the flap and vertical valve rod of band sealing gasket are set on valve seat, the valve seat below connects backwater and discharges the mouth of pipe, valve body top fixedly installs the diaphragm seat ring, is provided with the flexible sheet by vertical valve rod and Returnning spring supporting above diaphragm; On the sidewall of valve body, a side is offered water intake, connects water inlet segment, and the water inlet one-way valve is set in the water inlet, and a relative side sets out the mouth of a river, connects the water outlet pipeline section, and the place sets out water one-way valve at water outlet; Between pressure hydroecium that forms above the diaphragm seat ring and water inlet one-way valve upstream, be provided with cross over pipe, on the press water locular wall, offer No. 1 and test faucet hole and cock, on valve body wall, offer No. 2 and test faucet hole and cock, going out to offer on the water one-way valve downstream tube wall No. 3 tests faucet hole and cocks, discharge the mouth of pipe at water inlet segment, water outlet pipeline section, backwater adpting flange is set.

Aforesaid water inlet one-way valve, its valve seat is fixed on the water inlet, and valve seat central authorities connect valve rod, stop collar, Returnning spring, the flap of valve rod end connecting band sealing gasket;

Aforesaidly go out water one-way valve, its valve seat is fixed on the water outlet place, and valve seat central authorities connect valve rod, stop collar, Returnning spring, the flap of valve rod end connecting band sealing gasket;

Using method of the present utility model is, the liquid countercurrent preventer is connected in the water supply network, when the water forward flow in the pipeline, ductwork pressure is normal, because the local resistance of water inlet one-way valve makes the pressure of valve inner pressure a little less than water inlet segment, this moment, the pressure because of the pressure hydroecium equaled water inlet segment pressure, make flexible sheet motionless downwards, vertical valve rod pushes against valve seat, makes the backwater discharge tube be in closed condition; When current were static, if intake pressure is constant, the backwater discharge tube still was in closed condition; If intake pressure descends, intake pressure surpasses intake pressure in the valve body, the jack-up flexible sheet, and drive valve rod, flap are opened, and the backwater discharge tube carries out draining, as long as the valve body internal pressure than import low spot, is waved water discharge pipe and just closed automatically; If water outlet pipeline section hydraulic pressure raises, when surpassing intake pressure, the back pressure state promptly appears, and in a single day go out the water one-way valve seepage this moment, and then the valve body internal pressure increases, and the jack-up flexible sheet drives valve rod, flap, opens the backwater discharge tube, and backwater is discharged; In the feedwater process, when water supply network hydraulic pressure constantly descends, when reducing to 0.02MPa, Returnning spring jack-up flexible sheet drives valve rod, flap, opens the backwater discharge tube, carries out draining; When water supply network hydraulic pressure constantly descends, reduce to 0 or during negative pressure, the backwater discharge tube is opened fully, and air is entered in the valve body from the backwater discharge tube, forms the airspace, guarantees can not produce siphon and refluxes.1-3 number test faucet hole and cock are used in time measuring the each point hydraulic pressure value.

In a single day the utility model has the advantages that:,, thereby avoid the backflow pollution pipe network system in time with the backwater offtake piping system that flows backwards for the aqueous reflux phenomenon that occurs in the pipe network.Can directly survey and read the each point pressure value, be convenient to understand the working state of liquid countercurrent preventer.Compact structure is convenient to loading and unloading.Be applicable to and prevent in the water supply system pipe network of various occasions that backwater from flowing backwards.

Below in conjunction with drawings and Examples, the utility model will be further described:

Fig. 1 is the organigram of liquid countercurrent preventer of the present utility model

As seen from Figure 1, liquid countercurrent preventer of the present utility model, comprise valve body, valve seat, valve rod, flap, in valve body 1 bottom valve seat 2 is set, the flap 3 and vertical valve rod 4 of band sealing gasket are set on valve seat, the valve seat below connects backwater and discharges the mouth of pipe 5, and valve body top fixedly installs diaphragm seat ring 6, is provided with the flexible sheet 8 by vertical valve rod 4 and Returnning spring 7 supportings above the diaphragm seat ring; On the sidewall of valve body, a side is offered water intake, connects water inlet segment 10, and water inlet one-way valve 11 is set in the water inlet, and a relative side sets out the mouth of a river, connects water outlet pipeline section 12, sets out water one-way valve 13 at the water outlet place; Between pressure hydroecium 14 that forms above the diaphragm and water inlet one-way valve upstream, be provided with cross over pipe 15, on the press water locular wall, offer No. 1 and test faucet hole and cock 16, on valve body wall, offer No. 2 and test faucet hole and cock 17, going out to offer on the water one-way valve downstream tube wall No. 3 tests faucet hole and cocks 18, at the water inlet segment oral area adpting flange 19 is set, adpting flange 20 is set at water outlet pipeline section oral area.

The valve seat 21 of water inlet one-way valve is fixed on the water inlet, and valve seat central authorities connect valve rod 22, stop collar 23, Returnning spring 24, the flap 25 of valve rod end connecting band sealing gasket;

The valve seat 26 that goes out water one-way valve is fixed on the water outlet place, and valve seat central authorities connect valve rod 27, stop collar 28, Returnning spring 29, the flap 30 of valve rod end connecting band sealing gasket;

Claims

1, a kind of liquid countercurrent preventer, comprise valve body, valve seat, valve rod, flap, it is characterized in that, in valve body lower portion valve seat is set, the flap and vertical valve rod of band sealing gasket are set on valve seat, the valve seat below connects backwater and discharges the mouth of pipe, and valve body top fixedly installs the diaphragm seat ring, is provided with the flexible sheet by vertical valve rod and Returnning spring supporting above the diaphragm seat ring; On the sidewall of valve body, a side is offered water intake, connects water inlet segment, and the water inlet one-way valve is set in the water inlet, and a relative side sets out the mouth of a river, connects the water outlet pipeline section, and the place sets out water one-way valve at water outlet; Between pressure hydroecium that forms above the diaphragm and water inlet one-way valve upstream, be provided with cross over pipe.

2, liquid countercurrent preventer as claimed in claim 1, it is characterized in that, on the press water locular wall, offer No. 1 test faucet hole and cock, on valve body wall, offer No. 2 test faucet holes and cock, going out to offer on the water one-way valve downstream tube wall No. 3 test faucet holes and cock.

3, liquid countercurrent preventer as claimed in claim 1 is characterized in that, the valve seat of water inlet one-way valve is fixed on the water inlet, and valve seat central authorities connect valve rod, stop collar, Returnning spring, the flap of valve rod end connecting band sealing gasket.

4, liquid countercurrent preventer as claimed in claim 1 is characterized in that, the valve seat that goes out water one-way valve is fixed on the water outlet place, and valve seat central authorities connect valve rod, stop collar, Returnning spring, the flap of valve rod end connecting band sealing gasket.