AP212
60Pages

Standard and Low Noise series

External gear pumps components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Example of typical sound pressure level recorded in a semi-anechoic testing room . . . . . Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Rotation changing instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pumps seal kit NBR standard type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product identification plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General information The product range of Bucher Hydraulics SpA includes single pumps 05-100-212-212HP-250-300 (corresponding with the common group denominations: 05-1-2-2.5-3) and several combinations of double pumps, triple pumps, and so on, that can be assembled together according to versions of displacement, flanging, and auxiliary valves . External gear pumps are widely used in modern hydraulic systems due to their high performance, long service life and low purchase and maintenance costs. Product development of the new AP212 family has made it possible to achieve high operating...

1.1 External gear pumps components 11 I2 l3l |4||5| I6l7| |3| 1. Retaining ring 2. Shaft seal 3. Front cover 4. Balancing seal 5. Back up seal 6. Balancing block 7. Drive gear 13. Fixing screw and washer 1.1.1 Improvements (New AP212 vs AP200) Front covers : In addition to aluminium versions, complete new range of cast iron front covers Balancing blocks : New generation optimised and standardised balancing blocks Gears : New gears profile (12 teeth) with increased transmissible torque Bodies: New design pump bodies Back covers: Wide range of aluminium and cast iron back covers...

12 = number of new optimised teeth H = 15-18-21 AP212 optimised balancing area with higher performance materials AP212 Low Noise gear pump Pulsation reduced AP200 Standard gear pump 1.2 Example of typical sound pressure level recorded in a semi-anechoic testing room Noise reduction effects Oil temperature: 40°C - Oil viscosity: 32 mm2/s Distance between pump and sensor: 1 m

1.3 Technical data Features * Referred to pumps and motors with flanged ports. Utilising threaded ports, ** obtained with a specific balancing plate, please contact our Sales Center please to consider a significantly de-rated performances. The mechanical stress localised on threaded ports cause a reduced pump life performances IMPORTANT!: Please consult Bucher Hydraulics if even one of the operating limits indicated in the table (temperature, pressure, rpm) is exceeded, as well as in the case of two or more maximum values at the same time, or for applications with particularly heavy-duty...

1.5 Suction The absolute suction pressure must be Pin . 0.75 bar (11 PSI); therefore, the following conditions must be avoided: - large height differences between pump and tank - long stretches of piping M - special features such as: - bends - reductions in diameter - quick couplings - etc. It is also advisable to choose a filter of a suitable size to minimise any pressure drop and to take measures to pre­ vent gradual clogging over time. In certain cases, the suction pressure can exceed 1 bar (14.3 PSI), or atmospheric pressure. Please contact our Sales Department, solution for Pin 3 3.5...

1.7 Identifying the rotation direction The rotation direction of a gear pump is identified by looking at the pump from the front and with the drive gear turned upwards (see figures below). As regards reversible pumps (R), the ports are alternatively for suction and pressure. Pumps with a unidirectional rotation (D or S) have the denomination AP. Pumps with clockwise rotation (D) have a drive gear which turns clockwise, with the suction port on the left and the pressure port on the right. Pumps with counterclockwise rotation (S) have a drive gear which turns counterclockwise, with the...

Hexagonal-head screw ( TE screw) Lock washer Socket head screw (TCE screw) Dynamometric spanners 1.10 Calculating the specification of a gear pump The following parameters are defined: Vc = (cm3/rev) pump displacement; n = (rev/min) no. of rpms of the drive shaft; Q = (l/min) flow rate; p = (bar) operating pressure; T = (Nm) drive torque; N = (kW) Absorbed power; ^v = (%) volumetric efficiency; ^m = (%) mechanical efficiency; ^t = (%) total efficiency ^ Vc • n n

2 Overview standard types In the next pages, front, rear cover, and seals materials are listed for each pump series. For ordering purposes, it is enough to outline the complete pump description (for example: AP212/4.5 D 218). In case of a different configuration request (or a combination of different features, such as port threads, front flange materials, etc.), the description configurator shown in section 3.1 can be easily used. This pumps configuration are considered as “standard”. Aluminium front cover type Drive shaft Cast iron front cover type

For reversible pumps alternative inlet and outlet ports have the same sizes as per inlet unidirectional rotation.

Front cover: aluminium Body: aluminium Back cover: cast iron Shaft max torque: see section 3.3 Tightening torque: see section 3.5 - 3.6

Reversible pump ED - External Drain Gear pump material Front cover: aluminium Body: aluminium Back cover: cast iron Seals: NBR + HNBR Shaft max torque: see section 3.3 Tightening torque: see section 3.5 - 3.6 Reversible pump External Drain