Diesel Emissions Fluid Injection Nozzle Metering Unit 0 444 021 013 dosing module bosch

Diesel Emissions Fluid Injection Nozzle Metering Unit 0 444 021 013 dosing module bosch

Sandy(FM)
China Lutong Parts Plant
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China Lutong Parts Plant is a manufacturer specialist diesel fuel injection system accessory.
We have strong technique power, advanced equipment, craft, first class processing test equipment, perfect quality assurance system and excellent after services.




The Origin Of The Stanadyne DB2 Pump

With the DB2, engine rpm is controlled by a rotary fuel-metering valve. When the accelerator is depressed, the throttle linkage opens the metering valve in the injection pump, allowing more fuel to be delivered to the pumping chamber. Thus, the job of the injection pump is to not only accurately time the fuel delivery to the combustion chamber, but to also control the engine speed by varying the air/fuel ratio supplied to the cylinders.

The first practical design for a rotary distributor pump was engineered by Vernon Roosa, a diesel mechanic employed by the City of New York, where he maintained and repaired diesel-driven generators. Roosa patented his design in 1941, but it took him some time to generate any interest in his invention. Following the end of World War II, the Hartford Machine and Screw Company, a machine shop best known for producing aircraft engine components for Pratt and Whitney, decided to test out the Roosa design and brought its inventor to Hartford, Connecticut, to assist in research and development.

The DB2 is an opposed-plunger, inlet-metering, distributor-type diesel injection pump. It was designed for low-cost production and simplicity. A typical DB2 (there were slight variations on the design for different engines) has approximately 100 components and only four main rotating members. There are no spring-loaded components, none are lap-fitted in manufacture, and there are no ball bearings or gears. The pump has a single pumping chamber in which two opposed plungers are actuated by an internal cam ring.

The shape of the hydraulic head determines the distribution of fuel between cylinders, and because fuel flow can be preset, lengthy periods on the fuel pump test bench are eliminated.


The DB2 is near the end of its production cycle, being replaced by electronic-controlled diesels. For many enthusiasts, this pump was on their first diesel, and there are still thousands of them in use in Ford and GM trucks.

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