Zirconia is the material of choice for pumping plunger applications. A thermal expansion coefficient similar to steel allows a tight plunger/bore clearance to be maintained over the operating temperature range of the system. The superior scuff/seize resistance of the zirconia allows tighter clearances to reduce fluid leakage. The zirconia material we supply has been optimized for environmental stability and is well suited for high pressure fluid power applications, many other zirconias are not. Zirconia is also cost competitive with some coating systems, like titanium nitride.
These ceramic plungers have provided a substantial cost savings with respect to the conventional tool steel design.
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CELECT™ Metering Plunger - Click on the picture for more information |
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CELECT™ Timing Plunger - Click on the picture for more information |
Additional information is available in the June 2004 Diesel Progress article "Zirconia a Gem in Fuel Injector Application" .
CAPS Pumping Plunger
The Cummins CAPS (Cummins Accumulator Pump System), introduced in 1998, is a common rail fuel system currently used on the Cummins ISC mid-range diesel engine. The pumping plunger was the first ceramic component to be "designed into" a Cummins product. Prior to this, other materials were used for intial production and the ceramic became a retrofit. The success of the timing plunger gave Cummins' engineers the confidence to incorporate the zirconia pumping plunger into the CAPS pump early in the development process.
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CAPS Pump High Pressure Section |
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