Gear coatings for rotary gear pumps

Details Gear coatings for rotary gear pumps Gear coatings for rotary gear pumps

1997-09-11

1999-11-30

Vrablik, John J.

Rotary expansible chamber devices

With wear surface treatment or integrally plated wear layer

418179, 4182069, 29888023, F04C 218, F04C 1300

Patent

active

059931833

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.

REFERENCES:
patent: 2966860 (1961-01-01), Maynard
patent: 3918137 (1975-11-01), Telang et al.
patent: 4682939 (1987-07-01), Petro
patent: 4974318 (1990-12-01), Heppekausen et al.
patent: 5024591 (1991-06-01), Nakajima
patent: 5060531 (1991-10-01), Iguchi et al.
patent: 5554020 (1996-09-01), Rao et al.

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