Danfoss PVG 100 Technical Information

Also see for PVG 100: Technical information Installation guide Service and parts manual Technical information Service manual

Contents

Danfoss PVG 100 Technical Information Manual pdf 36 page image

OilThe main duty of the oil in a hydraulic system is to transfer energy; but it must also lubricate the movingparts in hydraulic components, protect them against corrosion, and transport dirt particles and heat outof the system. It is therefore important to choose the correct oil with the correct additives. This givesnormal operation and long working life.Mineral oilFor systems with PVG 100 valves Danfoss recommends the use of mineral-based hydraulic oil containingadditives: Type HLP (DIN 51524) or HM (ISO 6743/4).Non-flammable fluidsPhosphate-esters (HFDR fluids) can be used without special precautions. However, dynamic seals must bereplaced with FPM (Viton) seals. Please contact the Danfoss Sales Organization, if the PVG 100 valve is tobe used with phosphate-esters.The following fluids should only be used according to agreement with the Sales Organization forDanfoss:• Water-glycol mixtures (HFC fluids)• Water-oil emulsions (HFB fluids)• Oil-water emulsions (HFAE fluids)Biodegradable oilsPVG 100 valves can be used in systems with rapeseed oil.The use of rapeseed oil is conditioned by:• complying with the demands on viscosity, water content, temperature and filtering etc. (see chaptersbelow and technical data page 7).• adapting the operating conditions to the directions of the oil supplier.Before using other biodegradable fluids, please consult the Danfoss Organization.Particle content, degree of contaminationOil filtration must prevent particle content from exceeding an acceptable level, i.e. an acceptable degreeof contamination.Maximum contamination for PVG 100 is 23/19/16 (see ISO 4406. Calibration in accordance with theACFTD method).In our experience a degree of contamination of 23/19/16 can be maintained by using a filter fineness asdescribed in the next section.FiltrationEffective filtration is the most important precondition in ensuring that a hydraulic system performsreliably and has a long working life. Filter manufacturers issue instructions and recommendations. It isadvisable to follow them.System filtersWhere demands on safety and reliability are very high a pressure filter with bypass and indicator isrecommended. Experience shows that a 10 μm nominal filter (or finer), or a 20 μm absolute filter (or finer)is suitable. It is our experience that a return filter is adequate in a purely mechanically operated valvesystem.Technical Information PVG 100 Proportional Valve GroupOther operating conditions36 520L0720 • Rev EB • Jan 2014