Gear Pumps Basic Design BASIC PUMP PARTS 1 - Drive Gear 2 - Driven gear 3 - Bushings 4 - Body 5 - Flange 6 - Cover 7 - Rotary shaft seal 8 - Compensation seals 9 - Anti-extrusion seals - stop Ring - support ring External gear pumps are the most popular pumps used in modern hydraulic systems. They feature versatility, strength and long useful life. Their simple construction ensures limited purchase costs and servicing. They feature versatility, strength and long useful life. Their simple construction ensures limited purchase costs and servicing. Thanks to these basic concepts, together with ever-improving product design and features, research-based on many years of experience, accuracy in material selection, production process followed in great detail and tests on mass-produced parts, our gear pumps have reached top quality standards. 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). An elastic securing ring secures the ring in place. Gears are made of special steel. Their manufacturing process includes case-hardening and quench hardening. Then gears are 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 aluminium alloy and manufactured from die-casting. They are equipped with antifriction DU bearings (except forALP1 pumps). Pump body is aluminiumprofiled by means of extrusion. Micro-pumps andALP series models feature high-tensile aluminumalloy flange and covers, whereas GHP models have globular cast iron flange and covers. These materials minimize part deformation even when subject to continuous, intermittent and peak high pressure values. Special compensation zones onto bushings, insulated by special preformed seals with anti-extrusion ring, allow fully free axial and radial movement to the bushings, which is proportional to pump operating pressure. In 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. Marzocchi Pompe has introduced a splined drive system between the elements of amodular multiple pump. Shaft profile is splined by rolling, whereas the steel splined joint is a result of precision casting. Thanks to an accurate system design and precise setting of connecting part clearances, offsets occurring in assembled modular stages can be compensated still ensuring high power. Multiple pump stages can be easily installed, aligned and sealed through the use of a centring ringmade out of two pieces of different materials. This catalogues describes some models of modular stages belonging to the newALP and GHP series. These gear pumps consist of a pair of gears supported by two aluminumbushes, a body, a flange and a cover. www.jbj.co.uk/gear-pumps.html #DriveLineHarmony 10 11 6 2 7 5 8 9 3 1 4 8 9 6 3 10
RkJQdWJsaXNoZXIy NzQyNjQ=