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AIR BLEED VALVES
Hydraulic systems can effectively be bled with ELA air-bleed valves.
Easily installed - maintenance free- almost unlimited service life - simple - safe - reliable - efficient. The system can be operated immediately. No control irregularities due to air contamination of the pressure medium. Cost saving, as non-productive de-aeration time is saved.
The principle of the air bleed valve is based on the difference in behaviour of gases and liquids under pressure because of their dependence on viscosity. A piston, housed in the bore of the body with defined clearance, effects the opening and closing of the valve on start-up or shut-down of the system. On setting the system in operation, the accumulated air escapes until the liquid column of the pressure medium reaches the piston. The pressure of the liquid lifts the piston against the upper, high pressure seal, securely closing the air-vent (slight oil discharge may occur). When pressure is released the spring releases the piston reopening the air-vent, whereupon the procedure may be repeated. The special piston design prevents any intake of air in case of partial vacuum. The air bleed valve should be connected vertical, at the highest point of the hydraulic system or in places where air accumulation may occur.
The ELA air-bleed valves are available only for mineral oil based fluids, and within the temperature limits or -20° C to +90° C.