Difference Between Sliding-Stem Control Valve And Rotary-Shaft Control Valve
Update time: 21-06-11 Views: 2020
The Sliding-Stem Control Valves are the most commonly used type of Control Valves. The main reasons for its wide use are as follows:
1. High adjustment accuracy, it can provide a variety of different types of flow characteristics for selection.
2. Especially suitable for high pressure drop liquid and gas applications, with mature anti-cavitation and noise reduction technology.
3. The corresponding speed is fast and the action is sensitive.
Disadvantages:
1. The valve body has large flow resistance and large pressure loss.
2. The flow coefficient is relatively small.
3. It is not easy to make a large diameter, and the diameter is generally less than 500 mm.
4. Heavy weight and expensive.
Rotary-Shaft Control Valves are mainly Butterfly Valves and Ball Valves, which have the following advantages:
1. Large flow coefficient, small flow resistance, small pressure loss.
2. Small volume, light weight, relatively low price of the same diameter.
Disadvantages:
1. The nominal pressure is low, and the ability to overcome the pressure difference is weak.
2. Poor control performance.
3. Generally provide approximate equal percentage flow characteristics.
4. Rangeability is small.
5. The diamater only provides DN50 or more, which cannot meet the small flow control.
