A check valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves operate automatically and are typically not controlled by a person or any external control; as a result, most do not have valve handles.
An important concept in check valves is the cracking pressure, which is the minimum differential upstream pressure between the 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.
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Valve type (ball, gate, globe, check etc.), valve size, pressure class, valve material, and end connection (flanged, butt welding etc.)