Patent ID: 6601823
Filing Date: 2003-08-05
Classification: F16K

Abstract:
A valve for draining a process from a tank or conduit, comprising:a valve body; a first inlet formed in said valve body; an outlet formed in said valve body; an internal cavity formed in said valve body and in communication with said first inlet and said outlet, said internal cavity being at least partly defined by a bottom wall having a first side facing the process and a second side facing away from the process; a sealing tip, said sealing tip having a first side facing the process and a second side facing away from the process; a valve operating rod, said valve operating rod being connected to said sealing tip and movable to move said sealing tip into sealing contact with an annular surface about said first inlet into said internal cavity to form a first seal for sealing the internal cavity from communication with the process; a second seal, said second seal being a dynamic seal and being formed between said first side of said bottom wall of said internal cavity and said second side of said sealing tip to isolate said valve operating rod and the surrounding outside environment from the process.