A check valve is an automatic valve that operates by opening and closing its valve flap based on the flow of the medium. Also known as a one-way valve, reverse flow valve, or back pressure valve, its primary function is to prevent the medium from flowing back. The check valve plays a crucial role in preventing the pump and drive motor from reversing and ensuring that the container medium is discharged seamlessly. Essentially, it operates by automatically allowing the medium to flow in one direction and closing when there is a backflow. Its unique design ensures that it remains closed until the medium flows back in the correct direction.
The check valve is currently being tested and in the lift check valve, the disc axis is positioned at a right angle to the horizontal line. On the other hand, in the swing check valve, both the channel axis and the disc axis are positioned almost parallel to the horizontal line. These are important details to consider during the testing process.
In the strength test, the specified value of the test medium is introduced from the inlet end, and then the other end is sealed. Qualification is determined by checking for any leakage in the valve body and bonnet. A successful test is achieved when there are no signs of leakage in both the valve body and bonnet.
During the sealing test, we introduce the test medium from the outlet end and then check the sealing surface at the inlet end. The packing and gasket should not leak, and only if no leakage is found, can the test be considered as qualified.