DUAL FUEL HEATING ASSEMBLY WITH SELECTOR SWITCH

摘要

A heating assembly can include a switching valve which can include certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel. The valve can be used with either a first fuel or a second fuel different from the first. The valve can become locked or be held in either the first or the second position. For example, a set fuel pressure can cause the valve to move to a closed position and the valve can become locked or held in that position. If the pressure decreases, the valve can remain in the locked position. Actuation of a reset switch can allow the valve to move to a new position, such as an open position.

主权项

1. A dual fuel heating assembly for use with either a first fuel or a second fuel different from the first, the heating assembly comprising:
an inlet housing comprising:
a first pressure regulator configured to regulate a flow of fuel within a first predetermined pressure range;a second pressure regulator configured to regulate a flow of fluid within a second predetermined pressure range different from the first predetermined pressure range;a first housing outlet downstream of the first and second pressure regulators; anda second housing outlet downstream of the first and second pressure regulators;a first orifice;a second orifice; wherein each of the first and second orifices are configured for the combustion of regulated fuel received from the first housing outlet; a selector switch (SS) comprising:
an SS inlet configured to receive a flow of regulated fuel;a first SS outlet fluidly coupled to the first orifice;a second SS outlet fluidly coupled to the second orifice;an SS valve member and a corresponding SS valve seat; anda diaphragm, wherein the second housing outlet is fluidly coupled to the diaphragm such that a portion of regulated fuel flow acts on a backside of the diaphragm and wherein a pressure of the regulated fuel acting on the backside of the diaphragm determines whether the SS valve member is engaged with or disengaged from the SS valve seat, thereby determining whether regulated fuel entering the SS inlet is directed to one or both of the first orifice and the second orifice.