Abstract: The improved gas flow rate control regulator valve of the present invention maintains an optimum precombustion air to gas mass ratio for a wide range of air and gas flows within the combustion chamber of a furnace for efficient burning. The regulator valve of the present invention includes at least one piston diaphragm chamber containing a control piston for equalizing the pressure of the gas effluent with that of the precombustion air in a first preferred embodiment. In a second preferred embodiment, a bottom control piston chamber containing a piston of a size greater than the size of the top control piston is provided such that amplifier means for increasing the gas pressure are provided for application where the gas pressure to the combustion chamber must be greater than the pressure of the available precombustion air.

Abstract: The present invention provides an improved nozzle mixing line burner for automatically increasing available oxygen for combustion as the fuel gas flow rate increases. This improved nozzle mixing line burner includes a pair of fuel gas manifolds, each of which has a row of gas discharge ports discharging laterally and toward the opposite manifold to provide streams of fuel gas. An orifice plate extends between the fuel gas manifolds and includes a plurality of rows of air orifices extending along the line of the burner, with the air orifices closest to the gas manifolds being relatively smaller in size and the more internally disposed rows of air orifices increasing in orifice size toward the middle of the orifice plate, to increase the available air supply proportionately as the velocity of the fuel gas flow increases.

Abstract: The pneumatically controlled, variable oil pressure regulator of the present invention maintains a selected combustion ratio of oil and air to a furnace and includes in preferred embodiments a diaphragm housing for a flexible air diaphragm and a flexible oil diaphragm, each preferably including a rolled peripheral lip portion for maximum extensibility and connected to a valve plug having the shape of a solid of revolution formed by rotating a convexly curved surface such as an arc of a circle of less than approximately 90.degree. or a corresponding portion of a hyperbolic, parabolic, or elliptical curve, which intersects the longitudinal axis of the valve plug stem about the longitudinal axis thereof to approximate an ellipsoidal shape whereby very low minimum flow rates can be effected without oscillation of the valve.