SOLID WEAR PARTICLES /CONTAMIANTS IN MACHINE HYDRAULIC OILS
A recipe for trouble for the system. Particles whisked along with high flows and pressure result it being driven into tolerences and causing components and valves to stick and malfunction the sandblasting effect of solid contaminants multiplies the presence of particles exponentially
REASONS FOR CRITICAL HYDRAULIC SYSTEMS TO FAIL
Todays hydraulic systems contain minute pilot circuits with electronically controlled high pressure valves,which produce the exact hydraulic force to move the proportional valve directional spool.The internal parts have low tolerences and right size particles can render the equipment inoperable .
Hence these particles are a must to be removed from the oil.
CONTROL PUMPS AND SERVO VALVE MALFUNCTION
REASONS-1 VALVE JET STEERING – Sticking of large contaminants in the narow passages
REASON-2 FIRST STAGE STEERING- Wear of ball surface to ovalty due to smaller metal contaminants results in wrong steering of main spool.
REASON -3 NO OVERLAP IN EDGES OF SERVO VALVE- is restricted by contamainants and results in sticking of valve.
Control pumps and servo have very critical tolerences 1-10 micron and are very susceptible to fine contaminants.
NAS 6 ISO CODE 15/12 can be attained by depth filtration to ensure Kleen oil and a long trouble free operation of system.