US 6,485,636 B1Granted

Dual filter for diesel engine

OwnerLoren F. Mossinventor

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Abstract

A dual filter system for diesel fuel is provided, which allows the operator to keep the diesel engine running while inspecting or replacing one of the two fuel filters. The system includes an upper block which is divided into two identical mirror image sections. Each section has a shutoff valve, a fuel filter and a one-way check valve. Fuel is introduced into a common passageway and flows equally to each side of the upper block. Fuel is fed through each filter and filtered fuel moves through the one-way check valve to a common outport. In order to inspect or replace one filter, the fuel to the filter to be replaced is simply, shut off by the cutoff valve. All of the fuel then flows through the opposite side. The one-way check valves prevent fuel flowing through the opposite side from flowing back into the side which is being serviced. Air bleed valves are also provided in order to put the new filter side back in operation.

A dual filter device, comprising:

an upper block having left and right identical halves;
a central fuel inlet port in said block;
a common inlet passage in said block including a left hand portion extending from said central fuel inlet port to the left hand portion of the filter block and a right hand portion extending from the central fuel inlet port to the right hand portion of the filter block, wherein the left hand portion of the common inlet passage includes a left hand filter inlet port and the right hand portion of the common inlet passage includes a right hand filter inlet port;
a left hand shut-off valve located in the left hand portion of the common inlet passage between the central fuel inlet port and the left hand filter inlet port;
a right hand shut off valve separate from said left hand shut off valve, wherein said right hand shut off valve is located in the right hand portion of the common inlet passage between the central fuel inlet port and the right hand filter inlet port;
a central fuel outlet port in said block;
a common outlet passage in said block including a left hand portion extending from said central fuel outlet port to the left hand portion of the filter block and a right hand portion extending from the central fuel outlet port to the right hand portion of the filter block, wherein the left hand portion of the common outlet passage includes a left hand filter outlet port and the right hand portion of the common outlet passage includes a right hand filter outlet port;
a left spin-on fuel filter connected to the block in adjacent fluid communication with left filter inlet port and the right filter inlet port;
a right spin-on fuel filter connected to the block in adjacent fluid communication with the right filter inlet port and the right filter outlet port;
a left hand one way check valve located in the left hand portion of the common outlet passage between the central fuel outlet port and the left hand filter outlet port;
and
a right hand one way check valve located in the right hand portion of the common outlet passage between the central fuel outlet port and the right hand filter outlet port.

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Abstract

Claims2