Patent ID: 9746100
Date: 2017-08-29
CPC Classifications: F15B,F16K,Y10T

Claim:
1. A pneumatically drivable actuator for setting a position of a valve closure element in a valve, comprising: a piston, which is moveable in a pressure chamber by influence of a drive, gas; a locking mechanism for mechanically locking the piston relative to the pressure chamber; a first connector element connected to the piston, extending axially from the piston through an axial cylinder wall at least partly forming or enclosing the pressure chamber, presenting a connector that is accessible from outside the cylinder, and presenting, or forming part of a ventilation channel forming part of a ventilation device; a second connector element, which is directly or indirectly connectable to the wall; and the locking mechanism comprising a locking device, which is connectable to the first connector element and to the second connector element, such that relative movement between the piston and the pressure chamber is prevented in at least one direction; characterized by a ventilation device for venting the drive gas from the pressure chamber while the piston is mechanically locked relative to the pressure chamber, such that pressurization of the pressure chamber is prevented, wherein the first connector element comprises, or forms part of, a channel forming part of the ventilation device.