Importance

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Abstract

A gear pump receives fuel oil from an intake line leading from a storage tank and supplies pressurized fuel to a regulating valve which selectively opens and closes to control the flow of fuel to an oil burner. When the pump first starts but before the regulating valve opens, fuel bypasses the regulating valve and is returned to the tank along with any air that might be in the system, the system thus being automatically purged of air. After the regulating valve opens, excess fuel which is not required by the oil burner is returned directly to the inlet of the pump for recirculation and bypasses both the seal chamber of the pump and the storage tank so as to enable low flow velocity to be maintained in the intake line leading from the tank to the pump and thereby prevent cavitation at the pump when the fuel is of high viscosity. Only a small flow of fuel is directed to the seal chamber to lubricate the shaft of the pump. A magnetic ring in the seal chamber removes metallic components from the fuel in the seal chamber by magnetic attraction and also acts as a baffle to reduce excessive wear of the shaft.

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First Claim