Sit La Precisa S.p.a.

Roberto Dorigo

Stefano Zanella

Filiberto Rimondo

Massimo Giacomelli

Pierluigi De'Stefani

A valve unit for controlling the delivery of a fuel gas through a delivery duct () comprises a valve seat () in the duct, a closure member () associated with the seat, a motor-driven actuator () acting on the closure member in order to control it so as to open/close the valve seat, as well as an electromagnetic unit () with a first portion () carrying a magnetizing winding () and a second portion () which can be fixed firmly to the first position by magnetization. The electromagnetic unit () is associated with the actuator in order to act on the closure member () so as to close the valve seat (), irrespective of the operative position of the actuator (), upon the occurrence of a predetermined condition which requires the valve seat to be shut off, and the actuator means () is movable, together with the second portion () of the electromagnetic unit () so as to open/close the valve seat, the first portion () of the electromagnetic unit being connected to a stationary structure of the valve unit.

Valve unit for controlling the delivery of a fuel gas

A device for measuring the flow-rate of gas in a duct, particularly for burners. The device includes a gas flow-rate sensor generating a first output signal proportional to the flow-rate detected, a temperature-compensation circuit receiving the first output signal and generating a second output signal proportional to the gas flow-rate detected by the sensor and independent of the temperature of the gas and/or the flow-rate sensor. The compensation circuit has a temperature sensor. The device also includes a calibration circuit receiving the second output signal. The calibration circuit generates a third output signal proportional to the gas flow-rate detected and independent of structural parameters of the flow-rate sensor and/or of the temperature sensor so that the third output signal is correlated with the flow-rate detected and independent of the temperature of the gas, the temperature of the flow-rate sensor, and the structural parameters of the flow-rate sensor.

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Caorle, Italy

Roberto Dorigo