ACTUATOR FOR A VALVE AND A VALVE COMPRISING SUCH ACTUATOR

摘要

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

主权项

1. An actuator for a valve, comprising:
a first piston comprising a first piston rod, a first fluid chamber for the first piston, for enabling movement of the first piston and the first piston rod when fluid is introduced into the first fluid chamber, a second piston comprising a second piston rod, the second piston rod being coaxially arranged with the first piston rod and radially enclosing at least a part of the first piston rod, a second fluid chamber for the second piston, for enabling movement of the second piston and the second piston rod when fluid is introduced into the second fluid chamber, a first fluid channel in communication with each of the first and the second fluid chambers, for effecting, when fluid is introduced into the first fluid channel and thereby also introduced into the first and the second fluid chambers, movement of the first piston and movement of the second piston.