Check Valve (Liquid or gas) flows in one direction.
Check valves are two-port valves, which means there are two openings in the body for the liquid to come in and one for the liquid to be released. There are various types of check valves used in various types of work. Inspection valves are usually part of general household appliances. Although valves have different sizes and costs. But the general inspection valve is very small, simple or inexpensive. Check valves work automatically and most are not controlled by any person or any external control. So most do not have a handle on the valve or trunk. The chassis (outer shell) of the check valve is mainly made of plastic or metal.
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