A valve body for a valve includes a body having an internal cavity formed therein. An inlet passage and an outlet passage are formed in the body. The inlet passage has an inlet opening in communication with the internal cavity, and the outlet passage has an outlet opening in communication with the internal...http://www.google.es/patents/US7100894?utm_source=gb-gplus-sharePatente US7100894 - Circumferential sealing diaphragm valve
