Air Valve

Air Valve

    The new double-canisters Exhaust Valve consists of a big canister and a small one.

    When there is no water in the pipe, the canister in the body drops down to the full opening place. When water coming in, the air in the body is released from the big canister, then water can be filled into the pine immediately. When there is no air in the pipe, water comes into the valve cavity and causes the two canisters rise up to the closing place. And the big canister stays closed so as to improve the capacity of transporting water and to economize energy.Since air is often dissolved into water, when transporting water, the air is released from water continuously , however, when reaching the quantity, the small canister will drop down with a small amount of air released from air vents . Otherwise the air accumulating on the top of the pipe will reduce the pipe system`s capability of transporting water.

    When there is negative pressure in the pipe, the big canister drops down and the discharge hole is open. Then the valve takes in air in good time so that it can avoid affecting normal water supply due to the negative pressure on the pipe.

1.Unique design:

The two canisters are made of non-toxic engineering plastics of high strength., with concise structure, light weight, reliable and stable exhausting.

Inside and outside surfaces of the body, cover and dust-prevented cap are all coated with epoxy resin powder with no iron exposed. Materials of inner components are made of stainless steel and engineering plastics so as to prevent corrosion and to ensure purity of media.

The sealed seat, made of bronze, improves the ability of anti-abrasion, and prolongs service life.

2.Excellent anti-corrosion:

        Inside and outside surfaces of the body, cover and dust-prevented cap are all coated with epoxy resin powder with no iron exposed

3.Sanitary standard:

Non-toxic epoxy resin powder used comply with sanitary standard GB/T 17219-1998.The coated resin is in accordance with standards of drinking water.

4.Tested summary:

       The media is air.  In the procedure of the test, the air temperature shall keep between 5℃ and 45℃. The fluctuation of air flowing value shall be within 4% and that of the pressure value within 5% while that of air temperature value within 2%.

       Sealing test at a low pressure.  When the pressure goes up to 0.05 Mpa, 0.1 Mpa, 0.2 Mpa, 0.3 Mpa, 0.4 Mpa, 0.5 Mpa, the valve maintains the pressure at 12mins with no visually detectable leakage of the sealed surface.

        Repeated test of exhausting  Putting water into the valve and discharging air every 8-9 seconds. Then increasing the pressure to 1.6 Mpa , keeping it for 2mins before releasing. Conducting leakage test for 250 times with the result that there is no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.

         Repeated test of airing  Injecting air into the valve till the valve closes fully, then cutting off the air till the valve open fully. Repeating leakage tests for about 25000 times with the consequence of no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.

Test of the valve's endurance  The valve is poured by water with a pressure of 1.6 Mpa at a temperature of 50℃and maintaining it for five days, then checking whether the valve can be normally opened or not after releasing the pressure.Testing the leakage, resulting in no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.