A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which 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
are often part of common household items. Although they are available in a wide range of sizes and costs, many
check valves are very small, simple, and/or cheap. 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.
Supplier: Saitai Valve, China
Manufacturer: Shop in Shanghai Qingpu Industrial Park
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