Water Cooled Version Recommendations - Parker NK Series Technical Manual

3.4.5.

Water cooled version recommendations

3.4.5.1.
The cooling circuit is sealed by four O-rings seal between stator and user's housing.
Caution: The 2 O-rings must be greased with an ordinary lubricant
before mounting to avoid damages and leakages.
Caution: Be careful not to make damage on the O-ring during the
mounting to avoid leakage. It's recommended to realize a waterproof
test with 5 bars air pressure during 30 minutes and check if there is not
pressure decreasing.
Caution: Water inlet and outlet must be aligned with the cables inlet to
guarantee an optimized cooling circulation.
O-ring
Motor diameter
(mm)
NK3 75.92
NK4 94.97
NK6 126.72
NK8 151.64
3.4.5.2.
Condensation and risk of rust may occur when the temperature gradient between the
air and the water becomes significant, so drain holes must be integrated on the frame
design. These holes must be positioned at the lowest point in the motor housing.
Condensation water drain holes must be checked at least once a year
O-ring recommendations
Cross
section Material
(mm)
1.78 NBR
1.78 NBR
1.78 NBR
1.78 NBR
Condensation water drain hole
55 - PVD 3664_GB_NK-November 2016.Docx
Working
Hardness temperature
(°C)
70 shores -25 / +120
70 shores -25 / +120
70 shores -25 / +120
70 shores -25 / +120
PARKER part
number
5340P0069
5340P0081
5340P0077
5340P0093