Overview

• Because of their versatility, strength and long useful life, external gear pumps are the most popular pumps used in modern hydraulic systems
• Simple construction ensures limited purchase costs and servicing
• Good hydraulic, mechanical and volumetric efficiency, low noise level and, last but not least, compact dimensions and low weight/power ratio
• Usually consist of a gear pair supported by two aluminum bushings, a body, a securing flange and a cover
• Shaft of the driving gear projecting beyond the flange mounts a twin-lip seal ring (the inner lip being a seal and the outer being a dust seal)
• Elastic securing ring secures the ring in place
• Pump body, flange and cover are made of special hi-resistant aluminum alloys for minimized deformation even when subject to high pressure, be it continuous or intermittent or peak pressure
• Flange and cover are made out of spheroidal cast iron in order to ensure minimized deformation even when subject to high pressure, be it continuous or intermittent or peak pressure
• Body is profiled by means of extrusion, whereas flange and cover are obtained by means of die-casting or gravity casting
• Gears are made of special steel; their manufacturing process includes case hardening and quench hardening
• Gears are then ground and fine finished so to have a high degree of surface finishing
• Proper tooth profile design and geometric proportions ensure low pulsation levels and low noise levels during pump operation
• Bushings are made of special low-friction and hi-resistant aluminum alloy and manufactured from die-casting
• Equipped with anti-friction DU bearings
• Special compensation zones onto bushings, insulated by special pre-formed seals with anti-extrusion ring, allow fully free axial and radial movement to the bushings, which is proportional to pump operating pressure; this way, internal dripping is dramatically reduced, thus ensuring very good pump performance (both in terms of volume and in general) and proper lubrication of pump moving parts
• Special order pumps available with other mounts, shafts, and ports