①The main technical parameters a. Exhaust valve nominal pressure of PN10. b. Seal test pressure is 1.1MPa. c. Strength test pressure of 1.5 MPa. d. Exhaust valve water shut-off pressure should be ≤ 0.02 MPa. e. Exhaust valve air pressure should be closed ≥ 0.07 MPa. f. Pressure test should be consistent with the provisions of GB / T13927. g. Connecting flange should comply with the provisions of the standard GB / T17241.6-98. ② performance requirements a. Exhaust valve should have a larger displacement, when the empty pipe when the water pipe can be achieved in a very short period of time to quickly return to the normal water supply capacity. b. When the exhaust valve is under negative pressure in the pipe, the piston should be able to quickly open and quickly inhale the outside air to ensure that the pipeline will not be damaged due to negative pressure. And under the pressure of work to trace the air in the pipeline assembly. c. Exhaust valve should have a relatively high pressure to close the air, the piston closed in a short period of time before, there should be sufficient capacity to exhaust the air inside the pipeline is completed to improve water delivery efficiency. d. Exhaust valve water shut-off pressure should be less than 0.02MPa, at lower water pressure to close the exhaust valve, thus avoiding the large amount of water emission. e. exhaust valve should be stainless steel float (float) for the opening and closing pieces. f. Exhaust valve body should be provided with anti-impact protection of the inner cylinder, to prevent a large number of high-speed exhaust flow after the direct impact on the float (float) and the float (float) premature damage. g. For DN ≥ 100 exhaust valve split structure, a large number of exhaust valves and automatic exhaust valve to meet the requirements of the use of pipeline pressure. Automatic exhaust valve should be double lever mechanism, so that the buoyancy of the float can be greatly enlarged, and close the water level is low, the water is not easy to contact the sealing surface impurities, the exhaust port will not be blocked, and its anti-clogging performance can be greatly improved. At the same time under high pressure, due to the force exerted by the double lever, the float can be synchronized with the water level. The opening and closing parts will not be exhausted as the traditional valve is under high pressure. h. For high flow rate, frequent start pump, diameter DN? 100 conditions, in order to reduce the impact of water flow, exhaust valve should be installed buffer plug valve. Buffer plug valve should be able to prevent a lot of water spray but does not affect a lot of exhaust, so that water efficiency will not be affected, and effectively prevent the occurrence of water hammer. More Search Keywords: exhaust valve
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