Check valves (CV) are designed to allow the fluid/vapor to flow in only one direction to prevent backflow. There are four basic types: diaphragm check, lift check, swing check, and tilting-disk check. Check valves are also called non-return valves and are usually self-acting.
Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.

Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.

Sonwaysupply will offer you all types of check valves according to your specific needs.