The working principle of the lift check valve is that when the medium flows into the valve body from the direction indicated by the arrow marked on the valve body, the pressure of the medium acts on the valve disc to generate upward thrust. When the medium thrust is greater than the gravity of the valve disc, the lift check valve opens. When the force of the medium pressure behind the valve acting on the valve disc plus the weight of the valve disc itself is greater than the force of the pressure before the valve acting on the valve disc, the lift check valve is closed to prevent the medium from flowing back.
Installation of lift check valve:
- clean the lift check valve before installation, make sure the lift check valve is not damaged during transportation;
- When installation, the lift check valve should be installed on horizontal pipelines with the valve bonnet facing upward;
- After the installation is completed, check the connection between the valve body and the bonnet, whether the nuts are tightened, whether the flange is damaged by mistake.
- For long term storage, check the rust-proof condition regularly.
Lift check valve is mainly used in pharmaceutical, chemical, metallurgy, electric power, textile, purification equipment, petroleum and other industries to prevent the medium from flowing back.