Patent ID: 6361018
Filing Date: 2002-03-26
Classification: F16K

Abstract:
A coaxial valve for controlling a flow of a liquid or gaseous flow medium therethrough, comprising:a valve housing with an inlet, an outlet and a flow passage passing in a longitudinal direction therethrough from said inlet to said outlet; a closing body arranged in said flow passage in said housing; a valve sleeve slidably arranged in said flow passage so as to be slidable in said longitudinal direction between a closed position in which said valve sleeve contacts and seals against said closing body to close said flow passage and an open position in which said valve sleeve is spaced a distance apart from said closing body to open a valve flow opening between said valve sleeve and said closing body and allow the flow medium to flow from said inlet, through said valve sleeve in said longitudinal direction, through said valve flow opening and out of said outlet; an actuating drive including an electric servomotor and a linear actuator coupled to said servomotor and adapted to output a linear actuating motion; and a transmission mechanism connected between said linear actuator and said valve sleeve and adapted to transmit the linear actuating motion from said linear actuator to said valve sleeve; wherein said transmission mechanism comprises a rocker lever that extends transversely relative to said longitudinal direction and that includes a first end, a second end opposite said first end, and a middle section between said first and second ends; and wherein said transmission mechanism further comprises a drive bearing that articulately couples said first end of said rocker lever with said linear actuator, a locating bearing that articulately couples said second end of said rocker lever with said valve housing, and an actuator bearing that articulately couples said middle section of said rocker lever with said valve sleeve.