Product Overview
A lift check valve is a valve that automatically opens and closes the valve disc by the flow of the medium itself to prevent the backflow of the medium. It is also called a non-return valve, a one-way valve, a reverse flow valve, and a back pressure valve. A check valve is an automatic valve. Its main function is to prevent the backflow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. The check valve can also be used to provide supply to the auxiliary system where the pressure may rise to exceed the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Performance characteristics
1. Both ends of the valve passage must be blocked and stored in a dry and ventilated room. If stored for a long time, anti-rust should be checked frequently.
2. The valve should be cleaned before installation and defects caused during transportation should be eliminated.
3. During installation, carefully check whether the markings and nameplates on the valve meet the use requirements.
4. The lift vertical flap check valve should be installed on a vertical pipe.
5. The lifting horizontal flap check valve should be installed on the horizontal pipeline.
6. Do not let the check valve bear weight in the pipeline. The large check valve should be supported independently so that it is not affected by the pressure generated by the pipeline.
7. When installing the check valve, special attention should be paid to the flow direction of the medium. The normal flow direction of the medium should be consistent with the direction of the arrow indicated on the valve body, otherwise the normal flow of the medium will be cut off. The bottom valve should be installed at the bottom of the water pump suction pipeline.
8. The through lift check valve should be installed on the horizontal pipeline. The vertical lift check valve and the bottom valve are generally installed on the vertical pipeline, and the medium flows from bottom to top.
9. When the check valve is closed, water hammer pressure will be generated in the pipeline. In severe cases, it will cause damage to the valve, pipeline or equipment, especially for large-mouth pipelines or high-pressure pipelines, so the selector of the check valve should pay close attention.
Application field
Applicable to pipelines in various working conditions such as petroleum, chemical, pharmaceutical, fertilizer, and power industries
