Ventilation butterfly valve

Ventilation butterfly valves are used in the ventilation and environmental protection projects in the chemical industry, building materials, power station, glass and other industries in the dusty cold air or hot air gas pipeline, as a gas medium to regulate the flow or cut off the pipeline control device. This kind of valve should be installed horizontally in the pipeline.

Working Principle

Ventilation butterfly valve is divided into manual and electric drive, can be driven by the motor or turbine drive actuator, so that the butterfly plate in the 90 ° range of free rotation to achieve the purpose of opening and closing or regulating the flow of media.

Installation points

1. Installation position, height, import and export direction in accordance with the design requirements, pay attention to the direction of media flow should be consistent with the direction of the arrow marked on the valve body, the connection should be firm and tight.

2. Valve installation before the appearance of the inspection, the valve nameplate should be in line with the current standard ‘General Valve Signs’ GB 12220 provisions. For the working pressure greater than 1.0 MPa and in the main pipeline to play a role in cutting off the valve, the installation should be carried out before the strength and tightness of the performance test, qualified before being allowed to use. Strength test, the test pressure for the nominal pressure of 1.5 times the duration of not less than 5min, the valve shell, packing should be no leakage as qualified. Tightness test, the test pressure for the nominal pressure of 1.1 times; test duration in line with the requirements of GB 50243.

Characteristics

The structure of the ventilation butterfly valve is welded by using the centre line butterfly plate and short structural steel plate, so it has no internal components such as connecting rods and bolts, which will not cause some component problems in the process of using, so the failure rate is very low. It is easy to use. It is a kind of valve device. And because its sealing system is metal closed, although the sealing effect is not as good as the elastic seal, but the service life is longer than the elastic seal, and has the characteristics. So it has a wide range of applications in building materials, electric power, metallurgy and other industries. In the temperature is not higher than 300 degrees in the medium transport pipeline. This kind of butterfly valve can also be customised according to the needs of customers, the humanization.

Because the gap between the butterfly plate and the valve body of the ventilated butterfly valve is large, there is enough expansion space, so in the process of using it can prevent the thermal expansion and contraction brought about by temperature changes, and there will be no phenomenon of butterfly plate jamming. Common butterfly valves have a variety of driving methods, manual drive, electric drive and pneumatic drive, etc., the choice is very large. Because of the material, this kind of butterfly valve also has the characteristic of no friction when switching, and the service life is very long. Ventilation butterfly valve is a kind of valve made of welded steel plate, which has the characteristics of small size and light weight, easy to install, etc. Moreover, because of its small flow resistance and large circulation, it will not be affected by the expansion of high temperature. Its driving torque is small, the switch is very flexible, so it is easy to operate. Deeply loved by the industry.