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Text version of the page
| i"|BUCHER Vjtfi HYDRAULICS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2.2 Recommended fluids/Allowed temperatures We recommend using only mineral oil-based hydraulic Viscosity range: fluids that comply with the ISO/DIN standards. recommended 20 * 120 mm2/s (cSt) permitted up to 700 mm2/s (cSt) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating temperature | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A Attention: Use of pumps at temperatures above J\ 80°C must always be agreed upon with our Technical Office, and in any case this can cause a significant worsening in the volumetric efficiency. For use under conditions different from those indicated in this catalogue, please contact our Sales Department | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2.3 Suction | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| The absolute suction pressure must be V a 0.75 bar (11 PSI); therefore, the following must be avoided: • large height differences between pump and tank • long stretches of piping • 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 prevent gradual clogging over time. (Example 1) In certain cases, the suction pressure can exceed 1 bar (14.3 PSI), or atmospheric pressure. Please contact our Sales Department, solution for M1 s 3.5 bar (50 PSI) , are available. If in a particular application the M1 pressure is higher than the recommended value, contact our Sales Office. The diameter of the suction pipe should ensure that the oil speed will fall within the range: v = 0.6 - 1.2 m/s. (Example 2) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (Example 1) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (Example 2) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2.4 Filtration A short service life of a gear pump is normally due to the presence of impurities in the oil. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| It is therefore essential to have an effective filter in the system and to carry out regular maintenance to ensure a long, trouble-free service life. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| When possible and compatible with the hydraulic circuit installed, Bucher Hydraulics S.p.A. recommends that the system have total filtration (suction, pressure, return). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| We also recommend that an adequate air filter be installed on the tank to prevent contaminating substances such as dust, sand, etc. from getting into the oil, as these substances can enter the tank through the air flow caused by the level variations in the tank itself. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| In any case, the filtering system must constantly ensure an oil contamination class equal to or less than those shown in the following table. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 200-P-991218-E-02/09.07 AP | 5/96 | |||||||||||||||||||||||||||||||||||||||||||||||||||||