Dual fuel heater

  • US 8,281,781 B2
  • Filed: 06/27/2011
  • Issued: 10/09/2012
  • Est. Priority Date: 05/17/2006
  • Status: Active Grant
First Claim
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1. A heater comprising:

  • a regulator unit configured for regulating the pressure of either a first fuel within a first pressure range or a second fuel within a second pressure range different from the first, the first fuel being a different type of fuel from the second fuel;

    a main control valve having an outer housing and an internal valve, the main control valve configured to control a flow of fuel through the main control valve;

    a first flow channel configured to transmit fuel from the regulator unit to the main control valve;

    a first oxygen depletion sensor orifice selectably in fluid communication with the main control valve, the first oxygen depletion sensor orifice being fixed in position within the heater; and

    a second oxygen depletion sensor orifice selectably in fluid communication with the main control valve, the second oxygen depletion sensor orifice spaced from the first oxygen depletion sensor orifice;

    wherein heat from combustion of either the first fuel from the first oxygen depletion sensor orifice or the second fuel from the second oxygen depletion sensor orifice generates an electric current which maintains the main control valve in an open position to permit passage through the main control valve of the first fuel or the second fuel and when the combustion of either the first fuel from the first oxygen depletion sensor orifice or the second fuel from the second oxygen depletion sensor orifice is terminated, the main control valve closes thereby preventing passage therethrough of the first or second fuel.

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