Gear coatings for rotary gear pumps
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Sep 11, 1997
filing date -
Sep 11, 1997
priority date (Note) -
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Abstract
Gears for pumping non-lubricating fluids at high pressure are provided which include special coatings. One of the gears is coated with a combination of nickel and polytetrafluoroethylene; the other gear is coated with a combination of carbon and tungsten carbide. Because the coatings are different and have different hardnesses, galling is prevented. Preferably, the gears are fabricated from stainless steel and, therefore, in the event a scratch or nick in the coating is produced, corrosion is prevented. The gears are useful for gear pumps used to pump fire fighting liquids and foam at high pressures.
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