Wafer butterfly valve is a widely used valve. According to valve materials and driving forms, wafer butterfly valve can adapt to many different industries.
Sealing materials for wafer butterfly valves can be roughly divided into two types: soft sealing type and hard sealing type. Soft seal butterfly valve has excellent performance, but it can not be used in high temperature and high pressure pipeline due to the limitation of sealing materials. The sealing material of hard sealing butterfly valve is metal, which can resist high temperature and pressure, but its sealing performance is not particularly good.
Introduction of main parts and materials of wafer butterfly valve:
1.Valve body: gray cast iron, nodular cast iron, cast steel, stainless steel, etc.
2.Butterfly plate: nodular cast iron, cast steel, stainless steel, etc.
3.Valve stem: usually stainless steel;
4.Seat: soft seal (EPDM, NBR, PTFE, etc. ), hard seal (cemented carbide).
The driving forms of wafer butterfly valves are: handle drive, turbine drive, pneumatic drive, electric drive and so on.
Compared with valves with other connection forms, wafer butterfly valves have shorter structure length and smaller size, and are suitable for installation in narrow space environment. So what should we pay attention to when installing wafer butterfly valve?
- Before installation, clean the sealing surface of the valve and the inside of the pipeline without dust and impurities.
- The wafer butterfly valve needs a special flange. During installation, the flange hole position must be aligned with the “ear” hole position of the valve, and the flange part and the valve sealing ring are tightly pressed together.
- After the valve is fixed in the pipeline, it is necessary to do several valve opening and closing tests to observe whether there is blockage during the opening and closing of the butterfly plate.
- When installing the electric or pneumatic actuator of butterfly valve, attention should be paid to the position of actuator and butterfly plate, which should be assembled from opening to closing, and installed on the pipeline after assembly and debugging.
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