Main technical parameters and performance requirem

2022-08-12
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Main technical parameters and performance requirements of exhaust valve

plate thickness C. the strength test pressure is 1.5 MPa

d. the water closing pressure of the exhaust valve should be ≤ 0.02 MPa

e. the air closing pressure of the exhaust valve should be ≥ 0.07 MPa

f. the pressure test shall comply with the provisions of the standard gb/t13927

g. the connecting flange shall comply with the standard gb/t17241 Provisions of

② performance requirements

a. the exhaust valve should have a large exhaust volume, which can realize rapid exhaust and restore to the normal water supply capacity in a very short time when the empty pipe is filled with water

b. when the exhaust valve has negative pressure in the pipe, the piston should be able to quickly open and quickly suck in a large amount of external air, so as to ensure that the pipeline will not be damaged due to negative pressure. And it can discharge the trace air accumulated in the pipeline under the working pressure

c. the exhaust valve should have a relatively high air closing pressure. In a relatively short time before the piston is closed, it should have sufficient capacity to discharge the air in the pipeline and improve the water delivery efficiency

d. the water closing pressure of the exhaust valve should not be greater than 0.02MPa. The exhaust valve can be closed under low water pressure, so as to avoid a large amount of water gushing out

e. stainless steel floating ball (floating bucket) shall be used as the opening and closing parts of the exhaust valve

f. the exhaust valve body should be equipped with an anti impact protective inner cylinder to prevent the floating ball (floating bucket) from being damaged prematurely due to the direct impact of high-speed water flow after a large amount of exhaust (it may not return to the market until 3 (4) months to re measure the friction coefficient. Precautions for replenishing the stock floating bucket)

g. the exhaust valve with DN ≥ 100 adopts a split structure, which is composed of a large number of exhaust valves and automatic exhaust valves to meet the requirements of pipeline pressure. The automatic exhaust valve should adopt the multiple lever mechanism, so that the buoyancy of the floating ball can be greatly amplified, and the closing water level is low, so the impurities in the water are not easy to contact the sealing surface, and the exhaust port will not be blocked, and its anti blocking performance can be greatly improved. At the same time, under high pressure, due to the additional force of the complex lever, the floating ball can fall synchronously with the water level, and the hoist will not be sucked by high pressure like the traditional valve, so as to exhaust normally

h. for the working conditions of high flow rate, frequent start-up of water pump and diameter DN ≥ 100, in order to reduce the impact of slow water flow, which is the "ancestor" of the experimental machine family, the exhaust valve should be equipped with a buffer plug valve. The buffer plug valve shall be able to prevent a large amount of water spray but not affect a large amount of exhaust, so that the water delivery efficiency will not be affected, and effectively prevent the occurrence of water hammer

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