Danfoss PVG 100, Техническая информация

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Oil
The main duty of the oil in a hydraulic system is to transfer energy; but it must also lubricate the moving
parts in hydraulic components, protect them against corrosion, and transport dirt particles and heat out
of the system. It is therefore important to choose the correct oil with the correct additives. This gives
normal operation and long working life.
Mineral oil
For systems with this valve Danfoss recommends the use of mineral-based hydraulic oil containing
additives: Type HLP (DIN 51524) or HM (ISO 6743/4).
Non-flammable fluids
Phosphate-esters (HFDR fluids) can be used without special precautions. However, dynamic seals must be
replaced with FPM (Viton) seals. Please contact the Danfoss Sales Organization, if the PVG 100 valve is to
be used with phosphate-esters.
The following fluids should only be used according to agreement with the Sales Organization for
Danfoss:
•
Water-glycol mixtures (HFC fluids)
•
Water-oil emulsions (HFB fluids)
•
Oil-water emulsions (HFAE fluids)
Biodegradable oils
PVG 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 chapters
below 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 Contamination
Oil filtration must prevent the particle content from exceeding an acceptable level, i.e. an acceptable
degree of contamination.
Maximum contamination for is 23/19/16 (see ISO 4406).
Calibration in accordance with the ACFTD method.
A degree of contamination of 23/19/16 can be maintained by using a filter fineness as described in the
next section.
Filtration
Effective filtration is the most important precondition in ensuring that a hydraulic system performs
reliably and has a long working life. Filter manufacturers issue instructions and recommendations. It is
advisable to follow these.
System filters
Where demands on safety and reliability are very high a pressure filter with bypass and indicator is
recommended. 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 valve
system. The fineness of a pressure filter must be selected as described by the filter manufacturer so that a
particle level of 23/19/16 is not exceeded. The filter must be fitted with pressure gauge or dirt indicator to
make it possible to check the condition of the filter. In systems with differential cylinders or accumulators
Technical Information
PVG 100 Proportional Valve Group
Other operating conditions
36 | © Danfoss | May 2018 520L0720 | BC00000039en-US0502