Performance analysis of exhaust valve structure
The structure, type and installation application of the exhaust valve were analyzed , and the performance of the composite exhaust valve and the conventional exhaust valve were analyzed and compared.
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Three fine float ( cylinder ) type exhaust valve
This is the intake and exhaust valve produced by Zui early. Generally, it can not be automatically exhausted at a pressure greater than 0102 MPa . It can only be used for intake air and water and exhaust after the first water filling or accident repair, and the intake and exhaust speed is better than other forms. Slow, only suitable for the case of small intake and exhaust.
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Three fine float ( cylinder ) lever type exhaust valve
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It is improved on the basis of the float ( cylinder ) type exhaust valve. 08MPa。 The pressure is also vented in a large pressure state, the exhaust pressure is generally not more than 0. 08 MPa . The above two types of exhaust valves have a simple structure but have certain drawbacks. When the water vapor phase is large, the large exhaust port can only discharge the * segment of gas, and cannot be continuously exhausted. When the slope of the water delivery pipeline is not large, most of the pipelines are in a state of plug flow of a section of water. The buoyancy type of the float-type exhaust valve is small. After the exhaust gas is exhausted, the water lifts the float ball. The second gas is pressurized. The assumed pressure is 012 MPa . The force of the gas on the float is equal to the exhaust port. The area is multiplied by the pressure inside the pipeline. The calculated DN100 exhaust valve ball force is about 1 500 N, and the DN300 exhaust valve ball force is about 14 000 N. Therefore , it is impossible for the large exhaust port to automatically open the exhaust gas at the plunger flow. The exhaust function is lost in the state.
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Three precision cylinder type exhaust valve
The cylinder type exhaust valve is an intake and exhaust device that has appeared in recent years. It is a new device that is different from any other type of intake and exhaust valve according to the principle of cylinder. The principle is to control the pneumatic membrane inside the cylinder with a float lever or the like. The sheet moves to control the opening and closing of the valve body exhaust port. In the state of high pressure (1 MPa or less ) , both the multi-stage water column and the gas column phase, the pressure-free gas can be discharged at high speed.
The main features of this type of exhaust valve structure are : the effective exhaust diameter of the large and small exhaust ports or only the large exhaust port is not less than 70% of the nominal diameter of the exhaust valve , the exhaust port diameter is large , and the exhaust speed is fast . In any case, it can be exhausted at high speed. The general designer calculates the displacement by the nominal diameter of the exhaust valve when selecting the exhaust valve. The cylinder type exhaust valve can fully meet the design requirements , and truly prevents the water hammer and tube from appearing in the pipeline.
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Three-precision combined ( composite ) exhaust valve
The compound exhaust valve is a commonly used exhaust valve in China, and it is combined and improved on the basis of a float ( cylinder ) type and a float ( cylinder ) lever type exhaust valve. In the micro-pressure state by the exhaust gas exhaust float lever means; first charge with a large number of intake and exhaust float in water or other cases (cylinder) type device. The size of the intake and exhaust ports can be increased, so that the intake and exhaust speed is greatly improved.
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