US Patent 7100894 Circumferential sealing diaphragm valve

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 cavity. A circumferential sealing surface is formed on a wall of the internal cavity. The circumferential sealing surface extends between the inlet opening and the outlet opening and circumferentially around the internal cavity. Furthermore, a bottom line extending through the inlet passage, the internal cavity and the outlet passage forms a coplanar surface to allow for free-drainage of the body.