Valve with means to block relative rotation of parts during assembly

摘要

A fluid valve that comprises a body forming a cavity and a cap on the body extending over the cavity, the cap and body carrying interengaging threads allowing rotary make-up of the cap on the body; a diaphragm in the cavity and seated on a ledge formed in the body, thereby to form a seal; a pressure-transmitting element in the cavity to transmit cap thrust to effectuate the seal; and blocking structure to block relative rotary movement between the pressure-transmitting element and the body.