PVC double-run ball valve is a main accessory for controlling the flow of medium on chemical pipelines. The specific principle and structural cross-sectional view refer to the relevant material books. The valve consists of three parts: valve body, opening and closing mechanism, and valve cover.
PVC double function of ball valve
1. The opening and closing function blocks or communicates the flow of fluid in the pipe;
2. The adjustment function adjusts the flow and flow rate in the pipe;
3. The throttling effect causes a large pressure drop after the fluid passes through the valve;
4. Other functions a. Active opening and closing b. Maintain a certain pressure c. Steam blocking and drainage
Variety of PVC double order ball valve
1. Classified by use: cut-off valve, regulating valve, diverter valve, check valve, safety valve;
2. According to the force of action: other action valve, automatic action valve.
The pre-use inspection items of PVC double order ball valve include:
1. Whether there are blisters, cracks and other defects inside and outside the valve body;
2. Whether the connection between the valve seat and the valve body is firm, whether the valve core and the valve seat are consistent, and whether the sealing surface is defective;
3. Whether the connection between the valve stem and the valve core is reliable, whether the valve stem is twisted, whether the thread is damaged or corroded;
4. Whether the packing and gasket are aging and damaged;
5. Whether the valve is dexterous to open, etc.
Frequently Asked Questions
1. Flange and thread leakage at the connection with the pipeline;
2. Packing culvert leakage, waist pad leakage and valve stem can not be opened;
Post time: Jun-10-2022
