The check valve is a crucial mechanism for controlling backflow. It automatically ensures flow in one direction and prevents backflow.

The energy used to perform this function comes from the fluid itself, which eliminates the need for human action or any other mechanism to function.

It is widely used with coal or oil gas at high or low temperatures, as well as air and steam.

Valve Types

1 – Porthole Type:

They are ideal for use in liquids, industrial gas and liquid pipelines, and water systems. They are highly durable and have low maintenance costs.

2 – Piston Type

Used in pump discharge lines.

3 – Double Door Type:

Used in applications where the pressure drop caused by a different type of check valve would be significant. This results in a smaller pressure drop.

Maintenance of Check Valves

Check valves are generally installed at the beginning of the pipeline, between the pump outlet and the valve. They protect pumps from sudden shocks, which can result in the cessation of water flow due to a mechanical problem or a power outage.      

To perform perfect maintenance on Check Valves, it is necessary to stop pumping and close the valves to stop the flow.