- Check Valves
Check Valves allow fluid to flow in only one direction. They are two port valves, one for the fluid to enter, the other for it to exit. Check valves work automatically are not controlled by a person or any external control.
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.