Diesel Technology Company

Werner Faupel

Robert D Straub

A fuel pump or injector has a control valve with a piston valve body axially movable over a motion displacement interval defined by first and second sub-intervals. A first control valve spring causes the piston valve body to be biased toward the unactuated position whenever the piston valve body is in the first sub-interval. A second control valve spring causes the piston valve body to be biased into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.

Fuel pump control valve assembly

A fuel pump for a vehicular diesel fuel pump member having a control valve assembly which includes a housing having a control valve chamber, and an actuatable control valve disposed in the control valve chamber. The control valve includes a piston valve body axially movable over a motion displacement interval between first and second positions. The motion displacement interval is defined by first and second sub-intervals bounded by the first and second positions, respectively. The control valve assembly further includes means for actuating the control valve. A valve stop is disposed in the housing adjacent the control valve chamber, and a piston valve body seat contacts the valve stop whenever the piston valve body is in the second position. The piston valve body seat contacts a pump body seating surface whenever the piston valve body is in the first position. A first control valve spring resiliently biases the piston valve body toward the unactuated position whenever the piston valve body is in the first sub-interval. A second control valve spring resiliently biases the piston valve body into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.

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Wyoming, MI, United States of America

Werner Faupel