Patent ID: 8241034

Claim:
An apparatus comprising: a control valve configured to regulate fuel flow through the apparatus; a burner configured to produce a flame; and a valve assembly comprising: a housing defining: a first fuel input for receiving a first fuel from a first fuel source; a second fuel input for receiving a second fuel from a second fuel source; a first fuel output directing fuel received from either the first fuel input or the second fuel input toward the control valve; a third fuel input receiving a portion of either said first fuel or said second fuel from the control valve; a first egress flow path for directing at least some of said portion of said first fuel received via the third fuel input to the burner; and a second egress flow path for directing at least some of said portion of said second fuel received via the third fuel input to the burner; and a valve body configured to selectively permit fluid communication between the first fuel input and the first fuel output or between the second fuel input and the first fuel output, and configured to selectively permit fluid communication (a) between the third fuel input and the first egress flow path, and between the third fuel input and the second egress flow path, or (b) between the third fuel input and the first egress flow path, and between the third fuel input and the first and second egress flow paths.