| 摘要 |
A device is described for controlling the supply of fuel gas to a burner, in particular of a water heater appliance, comprising a main duct for supplying the gas between an inlet section and an outlet section, this main duct being 5 provided with at least one main valve including a respective valve seat associated with a corresponding shutter with a respective control for the opening of the seat in opposition to a respective resilient recall member. A pilot duct leads from the main duct downstream of the main valve in order to supply a pilot burner, the main duct being provided, upstream of the main valve, with io a magnetic thermoelectric safety unit with a manually armed switch or with an automatic arming system, which acts on the pilot duct to enable the gas to flow to the pilot burner when the unit is armed and the pilot duct being provided with a pressure regulator having a shutter with a membrane control, the membrane being subject on one hand to the pressure regulated by the is regulator and on the other hand to a calibration pressure determined in a calibration chamber of the regulator, a calibration spring being provided in the chamber and acting on the membrane. The device comprises fluid communication means between the calibration chamber of the pressure regulator and the main valve, in order to supply to this calibration chamber a 20 pressure signal correlated with the gas supply pressure when supplied to the main duct such that the pressure regulated by the regulator can be regulated at least to a first level, when there is no gas supply in the main duct, and to a second level, greater than the first level, when gas is being supplied in the main duct, the flow of gas supplied to the pilot duct being correlated with the 25 respective levels of the pressure signal supplied to the calibration chamber. 6e Iv 000oo -0 ooooos4 C>N |
