![]() ![]() Heart valves are essentially inlet and outlet check valves for the heart ventricles, since the ventricles act as pumps." Typically the check valve is designed for and can therefore be specified for a specific cracking pressure. The bodies (external shells) of most check valves are made of plastic or metal.Īn important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. 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. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. ![]() Check valves are often part of common household items. There are various types of check valves used in a wide variety of applications. ![]() "A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.Ĭheck 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. Retract resistor check valve application: pneumatic cylinder, piston driven by Compressed air through 2 Retract resistor check valves. ![]()
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