Abstract: Blocking device for pressurized gas pipelines includes: a blocking valve, which includes: a connection body; a movable shutter; a stem carrying the shutter; a fluid-dynamic actuator, configured to translate the stem; thrust means to bring the shutter from an operating position of opening to an operating position of complete closure; a control system for controlled actuation of the fluid-dynamic actuator, having a by-pass group for equalizing upstream pressures in an upstream chamber and downstream pressures in a downstream chamber, and a pressure reducer group interconnected with the bypass group, the pressure reducer group configured to receive a motorization fluid at a supply pressure as input, and to supply the fluid-dynamic actuator with a motorization pressure through a motorization line, the control system having a pressure differential selector that detects a signal of the upstream pressure and a signal of the supply pressure.

Abstract: A pressure regulator for gas distribution systems includes: a connection body for connection between an upstream pipe and a downstream pipe, the following elements being defined inside the connection body: an inlet duct an outlet duct, a high-pressure chamber connected to the inlet duct, a low-pressure chamber connected to the outlet duct, a passage opening between the high-pressure chamber and the low-pressure chamber, a movable shutter designed to obstruct the passage opening, components for moving the movable shutter in a controlled manner. The components for moving the movable shutter in a controlled manner include: a first main control head fixed to the connection body and configured to operate the movable shutter through a first control rod, a second auxiliary control head configured to operate the movable shutter through a second control rod fixed to the same movable shutter.

Abstract: A pressure regulator for gas distribution systems includes: a connection body for connection between an upstream pipe and a downstream pipe, the following elements being defined inside the connection body: an inlet duct an outlet duct, a high-pressure chamber connected to the inlet duct, a low-pressure chamber connected to the outlet duct, a passage opening between the high-pressure chamber and the low-pressure chamber, a movable shutter designed to obstruct the passage opening, components for moving the movable shutter in a controlled manner. The components for moving the movable shutter in a controlled manner include: a first main control head fixed to the connection body and configured to operate the movable shutter through a first control rod, a second auxiliary control head configured to operate the movable shutter through a second control rod fixed to the same movable shutter.