Device for regulating the delivery pressure of combustible gases

A device for regulating the delivery pressure of gases, which is arranged for use with gases of various natures, comprising:

• a valve unit having at least one valve seat and a respective closure element which is controlled by a diaphragm, is associated with said seat and is displaceable along a predetermined axis during the movement of opening/closing the seat,
• a first resilient actuator which can be regulated and which acts on the diaphragm in order to subject it to a first preselected resilient load,
• a first regulator capable of regulating the first resilient load exerted on the diaphragm by said first resilient actuator,
• a second resilient actuator which can be regulated and which can be activated selectively to exert an additional resilient load on the diaphragm, in addition to the first resilient load exerted by the first resilient actuator,
• a second regulator capable of regulating the load exerted by the second resilient actuator, said second regulator including a second checker connected to said second resilient actuator, which second checker can be associated selectively with the regulating device to convert it from a first operative configuration in which said second resilient actuator is inactive and is not exerting any resilient load on the diaphragm, to a second operative configuration in which it is are selectively activated to exert the additional preselected resilient load on the diaphragm, said first and second resilient actuators comprise respective springing systems coaxial with said axis,
• said first regulator comprising a respective first checker for the corresponding springing system of the first resilient actuator, which is axially displaceable in an adjustable manner along said axis by a male thread/female thread coupling, wherein
• said corresponding springing system of the first resilient actuator acts on the diaphragm,
• said device comprises a handle-form operator common to and associated with said first and second regulators in order to impose selectively, in each of said operative configurations, a desired delivery pressure value, between a minimum value and a maximum value of pre-calibration, said pressure value being proportionally correlated with a total predetermined resilient load exerted on the diaphragm,
• said male thread/female thread coupling is provided between said first checker and a stationary structure of the valve unit, it being possible to fix the handle-form operator for rotation with the first checker about said axis so that the rotational movement of the handle operator is converted into a corresponding axial translation movement of the first checker, with consequent regulation of the first resilient load exerted on the diaphragm by the springing system of the first resilient actuator, and in that
• the second checker, when activated in said second configuration, is fixed for translation along the axis with the first checker and is also fixed for rotation with the handle-form operator in order to regulate the resilient load of the second resilient actuator by rotation of the handle form operator and wherein adjustable stops are provided for the axial travel, along said axis, of said first and second regulator, in order to define the minimum and maximum values of the total resilient preload acting on the diaphragm in each of said configurations, so as to predetermine in a correlated manner the minimum and maximum values of the delivery pressures that can be imposed in the device.