Plug-type valve with lost-motion actuator

Claim 1

A plug-type valve, comprising a valve body formed with a generally conical valve seat and an inlet and outlet communicating therewith; a generally conical plug received in said valve seat and axially and angularly shiftable relative to said body, said seat and said plug defining an axis of rotation of said plug, said plug being formed with an axially extending shaft; a support bar perpendicular to said axis and spaced axially from said seat, and at least one rod mounting said bar on said body and extending parallel to said axis but spaced therefrom; a handle mounted on said bar and swingable about said axis, said handle being provided with an axle thReadedly engaging said shaft for axially shifting said plug upon angular displacement of said handle, said shaft being formed with a disk perpendicular to said axis and between said bar and said body, said disk being formed with a sector describing a path upon rotation of said disk about said axis which is intercepted by said rod, said disk further being formed with an arcuate slot centered on said axis; detent means interconnecting said plug and said handle for joint rotation over a limited arc, said detent means including a pin on said handle extending axially into said slot and receivable therein with lost motion about said axis, a rocker pawl having a first arm engageable with said pin, and spring means biasing said first arm into the path of said pin for entrainment of said disk therewith; and means including a second arm on said rocker pawl engageable with said rod for releasing said handle for angular displacement of said axle relative to said shaft upon angular immobilization of said plug by engagement of said sector with said rod whereby a rotating and a translating movement of said plug occur successively with angular displacement of said handle.