Valve assembly and disassembly device

Claim 1

A valve having a retractable valve seat, including a valve body having an inlet port, an outlet port and an upper opening in a first surface intermediate said inlet and output ports, a cover for closing the upper opening, a valve member for controlling the flow of fluid between the inlet port and outlet port, said valve seat being in contact with the valve member and a central chamber between said inlet port and said outlet port for receiving said valve member, said valve further comprising: means for retracting said valve seat, said means for retraction being formed of an elongated main section, a forward section and a rear section, said forward section including a camming surface for contacting said valve seat and having a variable diameter as well as a constant diameter portion, said rear section being formed for receiving a force for moving the means for retraction; and said first surface having holes formed therein for receiving said means for retraction, said holes being formed in a portion of said first surface which is not sealingly covered by said cover, whereby said means for retraction may be inserted in said holes without removing said cover; wherein said movement of the means for retraction causes the point of said contact of said camming surface to change to a point having said constant diameter, forcing said seat to retract and remain retracted in a locked position by said constant diameter.