Manual butterfly valve
The manual valve can be fully opened and fully closed, rotated it usually less than 90 degrees, high vacuum butterfly valve and butterfly locking bar itself is not strong, in order to position the disc to install the valve stem on the worm gear. The use of worm gear reducer, not only can make the butterfly plate with self-locking capability, so that the butterfly plate stops at any position, but also improve the operating performance of the vacuum valve.
The characteristics of sanitary butterfly valve can be used for high temperature and high pressure range, the valve nominal diameter is large, the valve body is made of carbon steel, the sealing ring of the valve plate is made of metal ring instead of rubber ring. Large scale high temperature butterfly valve is made of steel plate, which is mainly used for flue gas duct and gas pipeline in high temperature medium.
Manual butterfly valve actuator is featured by fast and convenient opening and closing , labor-saving, fluid resistance is small, you can often operate. It is featured by simple structure, small size, light weight. The valve can transport mud, at the mouth of the pipeline to accumulate liquid at least. Low pressure, can achieve a good seal, good adjustment performance.
Disadvantages of vacuum butterfly valve:
1 Pressure and working temperature range.
2. Poor sealing.
Vacuum butterfly valve:
The high vacuum butterfly valve can be divided into the following types: offset plate, vertical plate, inclined plate and lever type.
According to the seal, it can be divided into: two types of seal and hard seal. Generally, the soft sealing ring is made of rubber ring.
According to the type of connection can be divided into: flange connection and clamp connection.