| 摘要 |
A system for controlling the delivery of a fuel gas to a burner apparatus comprises a gas-delivery duct (1) extending between an inlet opening (2) and an outlet opening (3), a pressure-regulator device (4) including a servo-valve in the duct, having a closure member (6) with diaphragm control (7), the diaphragm being subjected, on one side, to the pressure regulated by the regulator device (4) and, on the other side, to a calibration pressure established in a calibration chamber (8) of the regulator, as well as a calibration spring (9) provided in the calibration chamber and acting on the diaphragm (7). The system also comprises a delivery-pressure modulator unit (11) including a modulation valve with a valve seat (12) disposed in the duct (1) downstream of the pressure regulator (4) and cooperating with a respective closure member (13) operatively connected to actuator means arranged for the modulation control of the delivery pressure, as well as flow communication means between the calibration chamber (8) of the pressure regulator (4) and the modulator unit (11), for bringing into the chamber (8) a pressure signal that is correlated proportionally with the gas-delivery pressure so that the pressure regulated by the pressure regulator (4) is in turn correlated with the pressure signal.
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