PATHOLOGY

Detailed explanation-1: -valve, in anatomy, any of various membranous structures, especially in the heart, veins, and lymph ducts, that function to close temporarily a passage or orifice, permitting movement of a fluid in one direction only. A valve may consist of a sphincter muscle or two or three membranous flaps or folds.

Detailed explanation-2: -Check valves are one-way or nonreturn valves that open with fluid movement and pressure, and close to prevent backflow of the pressure to upstream equipment such as pumps and compressors. In fact, check valves allow the fluid to flow in only one direction.

Detailed explanation-3: -Check Valves, also known as Non Return Valves (NRV) or One Way Valves, are automatic valves that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valve open with forward flow and close against reverse flow.

Detailed explanation-4: -Ball valves are quarter-turn valves that use rotating ported spheres inside the pipe to block and allow the flow of fluids-basically, a ball containing a hole. With the valve open, the ball allows the fluid to pass through. A ball valve controls pressure and flow.