When more than three ports are included, they generally require more than one diaphragm seat; however, special dual actuators can handle more ports with one membrane.
Valve Corporation | Thoracic diaphragm | variable valve timing | Valve | Poppet valve | Walschaerts valve gear | valve | Walshaert's valve gear | Variable valve timing | valve gear | Valve audio amplifier | The Omega Seamaster, a deep diving watch. The second crown (at 10 o'clock) is a Helium release valve | tap (valve) | Piston valve | Justice Safety Valve Act of 2013 | helium release valve | Flutter valve | Fleming valve | Diaphragm seal | desmodromic valve | Check valve | Artificial heart valve | Aortic valve stenosis |