The lift check valve refers to a valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, which is also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve whose main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. The check valve can also be used to supply a line in which the pressure may rise to an auxiliary system that exceeds the system pressure. The check valve can be mainly divided into a swing type check valve (rotation according to the center of gravity) and a lift check valve (moving along the axis).
Principle structure
During use of the valve, the medium flows in the direction of the arrow shown.
1. When the medium flows in the specified direction, the valve flap is subjected to the medium force. When the medium is reversed by the medium, the valve flap and the sealing surface of the valve seat are closely sealed due to the self-weight of the valve disc and the reverse force of the valve flap. Closed, to prevent the reverse flow of the medium.
2. The sealing surfaces of the valve body and the disc are made of stainless steel.
3. The structural length of the valve is in accordance with the provisions of GB12221-1989, and the flange connection size is in accordance with JB/T79-1994.
1, the valve passage must be blocked at both ends, there is a dry and ventilated room. If stored for a long time, always check for anti-corrosion.
2, the valve should be cleaned before installation, and eliminate the defects caused during transportation.
3. When installing, you must carefully check whether the signs and nameplates on the valve meet the requirements for use.
4. The lift vertical flap check valve should be installed on the horizontal pipe.
5. The lift horizontal flap check valve should be installed on the vertical pipe.
6. Do not allow the check valve to bear weight in the pipeline. The large check valve should be independently supported so that it is not affected by the pressure generated by the piping system.
7. When installing the check valve, pay special attention 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 pump suction line.
8, the general 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. If it is serious, it will cause damage to the valve, pipeline or equipment, especially for large-mouth pipeline or high-pressure pipeline, so it should cause the check valve selector. Highly noticed.
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