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SCREW ROTOR CLEARANCE
Screw rotor clearance must be precisely maintained to provide maximum pumping efficiency, yet
prevent contact between screw rotors, screw case, and front cover during operation.
If pumping efficiency is lower than expected or if parts contact has occurred during operation (Within
rated differential pressure), check the screw rotor clearances and adjust, if incorrect.
Model
ZS100 SERIES
ZS200 SERIES
ZS300 SERIES
Clearances for Standard (mm)
Screw to Screw
Screw to Housing
(A/B)
0.1
0.12
0.15
Clearances for High Pressure (mm)
Screw to Screw
(B)
0.1
0.2
0.12
0.24
0.15
0.3
Fig. 17
Screw to Housing
0.2
0.24
0.3
13
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