Luer syringe activated valves and one way valves are used as in-line check valves or directional flow control valves Luer syringe activated valves and one way valves are used as in-line check valves ...

Varicose veins - distended, visible superficial veins on the legs - are almost always the result of problems with valves within the venous system of the leg. All leg veins contain one-way flap valves ...