ACTUATOR FOR A VALVE AND A VALVE COMPRISING SUCH ACTUACTOR

摘要

Actuator (1) for a valve (2), comprising a first piston (11), a first piston rod (13) and a first fluid chamber (12) for enabling movement of the first piston (11) and the first piston rod (13). The actuator (1) has a second piston (40), a second piston rod (45), the second piston rod (45) being coaxially arranged with the first piston rod (13) and radially enclosing at least a part of the first piston rod (13). A second fluid chamber (43) is arranged for the second piston (40), for enabling movement of the second piston (40) and the second piston rod (45). A first fluid channel (80) is arranged in communication with each of the first and the second fluid chambers (12, 43), for effecting, when fluid is introduced into the first fluid channel (80), movement of the first piston (11) and the second piston (40). Also, a valve comprising such actuator (1) is disclosed.