Abstract: A valve system (1) comprising a valve body (20) and a stuffing box (30) assembled to the valve body (20), the valve body (20) having an internal surface (29) defining an annular groove (21), the annular groove (21) comprising an upper side (22), a lower side (23) and a bottom (24) extending axially between the upper (23) and lower (23) sides, the annular groove (21) forming with the stuffing box (30) an annular cavity (80) for receiving a sealing element (15).

Abstract: A valve system (1) comprising a valve having a valve stem (50), a valve body (20) and a stuffing box (30) assembled to the valve body, the valve system comprising a washer (60) in contact with the stem (50) and the stuffing box (30), the washer (60) comprising an electrically conductive material.

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)