Here’s a review of the basic types of valves, how they work, functions they perform, and trade-offs when choosing one over another. On-off valves On-off control is the most basic valve function.

Type 1 — in which the valves function normally but dilation (widening) or openings cause the leaks Type 2 — in which excessive leaflet tissue causes aortic cusp prolapse ...

Exploring the criteria — including size, function and connection options — for pilot valve manifolds deployed in ...

You may need a certain type of valve to match up with the configuration of the new shower you have. Since putting in a new valve is usually a plumbing project best left to the pros, you can save ...

A leaky heart valve (also known as valve regurgitation) is a valve that doesn’t close properly. This means that blood can flow backward in the heart and potentially affect heart function.

Mitral regurgitation derives from anatomical or functional impairment of one or more components of the mitral apparatus that are necessary for normal valve function, including the left ventricle ...

Nat Clin Pract Cardiovasc Med. 2005;2(2):60-61. Several strategies for heart valve tissue engineering are evolving. They include the use of decellularized allogenic or xenogenic valve matrices ...