Global Pipeline System Solution Provider
Product Description
DEFINITION
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
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. There are various types of check valves used in a wide variety of applications. 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 metal like ductile iron and steel.
An important concept in check valves is the cracking pressure which is the minimum differential upstream pressure between inlet and outlet at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
TYPE OF CHECK VALVES
ball check valve/diaphragm check valve /swing check valve or tilting disc check valve/stop-check valve/ lift-check valve/in-line check valve/duckbill valve/pneumatic non-return valve/ reed valve /etc.
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