Structural performance analysis of exhaust valves

This is the earliest production of intake and exhaust valves, generally can not be in the pressure greater than 0.02MPa state automatically exhaust, can only carry out the intake and in the first filling of water or accidental maintenance after the filling of water exhaust, and intake and exhaust speed is slower than the other forms of only suitable for intake and exhaust volume of the situation is not large.
It is improved on the basis of float (cylinder) type exhaust valve. Through the lever principle, it can be used for exhausting in the state of large pressure, and the maximum pressure of exhausting is generally not more than 0.08MPa.
The above two types of exhaust valve structure is simple, but there are some defects. When the water and gas between the large exhaust port can only discharge the first section of gas, can not be continuous exhaust. When the slope of the pipeline is not large, the pipeline is mostly a section of water and a section of gas plunger flow state. Float type exhaust valve buoyancy is small, exhaust after the first section of gas water will float up, the second section of gas that is under pressure, assuming that the pressure is 0.12MPa, the gas on the float of the support force is equal to the exhaust port area multiplied by the pressure in the pipeline, calculations show that the DN100 exhaust valve support ball force of about 1,500 N, DN300 exhaust valve support ball force of about 14,000 N, so it is impossible for the large vent to open the vent automatically, the loss of exhaust in the plunger flow state, the large exhaust port can not automatically open exhaust. In the plunger flow state, the exhaust function is lost.
As an air intake and exhaust equipment that appeared only in recent years, it is a brand-new device made according to the cylinder principle, which is different from any other kind of air intake and exhaust valves, and its principle is to control the pneumatic diaphragm action in the cylinder with the float lever and so on, so as to control the opening and closing of exhaust port of the valve body. In the high-pressure (1MPa below) state, whether it is a multi-section water column, gas column between the pressurised and unpressurised gas can be discharged at high speed.
The main feature of this type of exhaust valve structure is: large and small exhaust port or only large exhaust port of the effective exhaust calibre is not less than 70% of the nominal diameter of the exhaust valve, exhaust calibre, exhaust speed, and in any case can be high-speed exhaust. General designers in the selection of exhaust valves to exhaust the nominal diameter of the exhaust valve to calculate the exhaust volume. Cylinder type exhaust valve can fully meet the design requirements, and really play a role in preventing the pipeline water hammer and pipe burst.

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