Valve system

Abstract

A valve system comprising: a valve (4) including a valve stem (13); a valve actuator (2) for controlling opening and closing of the valve (4) and comprising a piston (14) coupled to the valve stem (13) and defining a first chamber (6) of the valve actuator (2), a valve positioner (3) for controlling the valve actuator (2) and adjusting the position of the valve stem (13), and a coupling system (10) comprising: a coupling element (20) for connecting the valve positioner (3) to the valve actuator (2), the coupling element (10) comprising a first channel (22) in fluid communication with a fluid outlet of the valve positioner (3); a stem extension (30) that moves with the valve stem (13) and comprises a second channel (32) in fluid communication with the first channel (22) and the first chamber (6) of the valve actuator (2)

Dependencies are inferred from the claim text.