Installation Regulations And Precautions For Pneumatic Butterfly Valves

Installation regulations for Sanitary Butterfly Valve:
1. When installing the pneumatic butterfly valve, pay attention to the material fluid mechanics position and the arrow mark position.
2. Pneumatic butterfly valves and concealed stem gate valves cannot be installed naturally to prevent the valve stem from rusting. In the pipe trench with a back cover, the gate valve should be installed, maintained, inspected and operated.
3. When pneumatic butterfly valves are installed in horizontal pipelines, the valve stem must be installed vertically upward, or at a certain angle, and the valve stem is not allowed to be installed downwards.
4. For gate valves connected with flanges and bolts, the gate valve must be closed during installation. When installing the flange gate valve, ensure that both sides of the flange are parallel and consistent with each other.
Installation regulations and precautions for pneumatic butterfly valves
Frequently Asked Questions:
1. The opening degree of the pneumatic butterfly valve is related to the flow rate, and most of them show a linear proportional change. If it is used to control the flow, its flow characteristics are also closely related to the fluid density of the pipeline. For example, if two pipelines are constructed with the same gate valve specifications and methods, but the pipeline damage index is different, the flow difference of the gate valve will be quite different. big.
2. If the valve is in a state where the throttle force is very strong, cavitation will easily occur on the back of the valve body, which may damage the valve. It is usually used outside 15°.
3. When the pneumatic butterfly valve is in the middle opening position, the opening shape formed by the oil circuit plate and the front end of the butterfly plate is centered on the valve axis. Different situations occur on both sides, and the front end of the butterfly plate on one side moves along the direction of the water flow. The other side moves in the direction of the reverse flow of water. Therefore, one side of the oil circuit plate and the valve body has a nozzle-shaped opening, and the other side has a similar opening to the throttle valve hole. The water flow rate on the nozzle side is much faster than that on the throttle side, while the throttle side The air pressure will be generated under the valve, so the rubber product will fall off.
4. The actual operating torque of pneumatic butterfly valves has different values ​​due to differences in opening degree and valve opening and closing range. Vertical pneumatic butterfly valves, especially large-sized valves, cannot operate due to the water level, the torque on the valve shaft, and the difference in the drain head. ignore. On the other hand, when the equipment on the inlet side of the gate valve bends, bias flow will occur and the torque will increase. When the gate valve is in the middle opening position, the operating mechanism must be locked due to the action of the water flow torque.