Check valves are one-way safety valves that allow the liquids passing through the piping to move in one direction, prevent their return, thus ensuring a healthier and more efficient operation of the system. Check valves are simple devices. They perform a very important function by preventing reverse flow.
The reverse flow that may occur in the pipeline is often caused by valves, pumps, etc. connected to the line. may cause damage or malfunction of other devices. It can cause loss of system integrity even if there is no malfunction. The operation of the check valve with a single inlet and outlet is based on the pressure difference. The valve opens when the pressure from the inlet direction is greater than the pressure downstream. If the pressure in the inlet direction is lower than the pressure in the outlet direction, it is closed and the return of the fluid is prevented. Check valves do not require an actuator or manpower as in the on-off principle of other valves. Closing and opening is completely automatic.
Check Valve Types
There are multiple types of check valves according to the system to be used. Selection should be made according to factors such as the type of fluid, operating mode, installation direction, maximum pressure, connection point, temperature, closing speed. The main varieties are:
- Check Valve (Swing )
- Wafer Check Valve
- Spring Check Valve
- Disk Check Valve
- Dual Check Valve