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Gas valve with high/low gas pressure detection

  • US 9,995,486 B2
  • Filed: 12/15/2011
  • Issued: 06/12/2018
  • Est. Priority Date: 12/15/2011
  • Status: Active Grant
First Claim
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1. A valve assembly for controlling fuel flow to a combustion appliance, the valve assembly comprising:

  • a valve body having an inlet port and an outlet port, with a fluid path extending between the inlet port and the outlet port;

    a first valve situated in the fluid path between the inlet port and the outlet port;

    a second valve situated in the fluid path between the inlet port and the outlet port downstream of the first valve, with an intermediate volume between the first valve and the second valve defined by the valve body;

    a first valve actuator, secured relative to the valve body, for selectively moving the first valve between a closed position, which closes the fluid path between the inlet port and the outlet port, and an open position;

    a second valve actuator, secured relative to the valve body, for selectively moving the second valve between a closed position, which closes the fluid path between the inlet port and the outlet port, and an open position;

    a first pressure sensor positioned upstream of the first valve, the first pressure sensor sensing a pressure in the valve body upstream of the first valve and providing a first measure, which at least tracks the sensed pressure in the valve body upstream of the first valve;

    a second pressure sensor positioned downstream of the second valve, the second pressure sensor sensing a pressure in the valve body downstream of the second valve and providing a second measure, which at least tracks the sensed pressure in the valve body downstream of the second valve; and

    a controller in communication with the first pressure sensor and the second pressure sensor, the controller configured to;

    compare the first measure, which at least tracks the sensed pressure in the valve body upstream of the first valve, with a first pressure threshold, and if the first measure goes beyond the first pressure threshold, the controller provides a predetermined first output signal, causes the first valve actuator to close the first valve, and causes the second valve actuator to close the second valve;

    compare the second measure, which at least tracks the sensed pressure in the valve body downstream of the second valve, with a second pressure threshold that is different from the first pressure threshold, and if the second measure goes beyond the second pressure threshold, the controller provides a predetermined second output signal, causes the first valve actuator to close the first valve, and causes the second valve actuator to close the second valve; and

    compare the first measure with a third pressure threshold that is different from the first pressure threshold, and to provide a predetermined output signal if the first measure goes beyond the third pressure threshold.

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