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User Manual
ATEX / UKEX Certified Variable Axial Piston Pumps for Industrial Applications – PVM 18 – 141 cc
Installation, Operation and Maintenance
Installation, Commissioning and General Operation of ATEX / UKEX PVM Pumps
When assembling the pump in the machine/system it is the builder's responsibility that the parts used
conform to the ATEX directive or UKEX statutory instruments and that the components are assembled and
running according to the operational data/design found in product data sheets and instructions.
Only use the pump as required by the explosion protection shown on the name plate.
Always ensure that the following is maintained:
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Manufacture the assembly flange on the machine/system where the pump has to be installed: the
relevant surface has to be perfectly smooth, completely de-greased and non-deforming. Coupling and
protection elements shall meet the material requirements relevant to the respective ATEX / UKEX
requirements (e.g. avoiding magnesium, titanium, zirconium)
It is necessary to verify the perfect alignment between the prime mover (e.g. engine/ e-motor) output
shaft and the pump – the fitment between pump shaft and prime mover shaft must be executed so that
no radial or axial pre-load is generated – these extra loads reduce the bearings expected lifetime and can
increase heat generation.
10 | Vickers by Danfoss | January 2024
The ambient conditions specified in this manual are maintained.
The pump may only be operated with the housing fully mounted, unopened and in an undamaged
condition.
The pump must be installed per specific orientation as specified within the pump catalog. The
pump should be mounted in such a way, so that the case drain port is on the top of the pump.
The supporting frame, chassis, or structure of equipment containing the pump shall be constructed
of electrically conducting material and shall be so arranged as to provide a leakage path to earth
(ground) for any static electricity which occurs on the pump.
If this is not possible, a grounding wire needs to be attached to the pump housing. Consult Danfoss
for recommendations on connection placement.
The pump is approved for operation with the selected hydraulic fluid.
It is compulsory to use oils whose inflammable degree is at least 50K above the maximum surface
temperature of the pump according to the temperature classification (T4, T3...).
The hydraulic fluid must be filtered to ensure the cleanliness stated above.
All types of accessories installed on the pump are ATEX / UKEX specified and have been installed in
accordance with ATEX / UKEX requirements.
There are no creeping metal elements external to the pump.
There are no plastic parts that might accumulate electrostatic; or they are shielded.
The inlet and case drain oil and ambient temperature is monitored to not exceed the maximum
permissible for the category and temperature class of the associated zone. The system must shut
down if the case drain oil temperature exceeds 118 °C [245 °F] or inlet temperatures exceed the
limits stated within this manual.
The pump may only be operated when fully primed and filled with oil. An active oil level alarm shall
be used. The system should safely shut down in the event of a low oil alarm.
The pump must be protected against overloading and over-speeding using suitable measures. This
includes the installation of pressure-relief valves to prevent the pump from exceeding the maximum
allowable pressures as given by the catalog.
For applications where running the pump for extended periods (>3 min) at "high-pressure – low
flow" (e.g. pressure compensated stand-by) conditions cannot be avoided, it is highly
recommended to install case flushing. Consult Danfoss representative for advice.
BC479055194216en-000101
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