
34 UNIBLOC-PD Operation & Service Manual: PD600-677
6.4 Rotor Clearances
The tables below list the clearances between the rotor housing and the rotors. If the rotor class is not known you must
contact your pump supplier to retrieve the correct clearance information. Always refer to pump serial number and/or
have process conditions available.
Class B Stainless Steel Rotors, x0.01 mm (x0.001in.)
UNIBLOC
MODEL
POSITION
1-6
7
8 & 10
9 & 11
600/602
22-24
(8.7-9.4)
14-16
(5.5-6.3)
35-37
(13.8-14.6)
12-14
(4.7-5.5)
650/652
35-37
(13.8-14.6)
14-16
(5.5-6.3)
44-46
(17.3-18.1)
14-16
(5.5-6.3)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class C Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
35-37
(13.8-14.6)
16-18
(6.3-7.1)
54-56
(21.3-22.0)
14-16
(5.5-6.3)
650/652
44-46
(17.3-18.1)
16-18
(6.3-7.1)
67-69
(26.4-27.2)
16-18
(6.3-7.1)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class D Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
42-44
(16.5-17.3)
21-23
(8.3-9.1)
72-74
(28.3-29.1)
17-19
(6.7-7.5)
650/652
51-53
(20.1-20.9)
21-23
(8.3-9.1)
87-89
(34.3-35.0)
20-22
(7.9-8.7)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class E Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
50-52
(19.7-20.5)
25-27
(9.8-10.6)
90-92
(35.4-36.2)
21-23
(8.3-9.1)
650/652
58-60
(22.8-23.6)
25-27
(9.8-10.6)
107-109
(42.1-42.9)
24-26
(9.4-10.2)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
High Temp./Low Pressure Applications
Class B Stainless Steel Rotors, x0.01 mm (x0.001in.)
UNIBLOC
MODEL
POSITION
1-6
7
8 & 10
9 & 11
600/602
22-24
(8.7-9.4)
14-16
(5.5-6.3)
35-37
(13.8-14.6)
12-14
(4.7-5.5)
650/652
35-37
(13.8-14.6)
14-16
(5.5-6.3)
44-46
(17.3-18.1)
14-16
(5.5-6.3)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class C Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
35-37
(13.8-14.6)
16-18
(6.3-7.1)
50-55
(19.7-21.7)
15-20
(5.9-7.9)
650/652
44-46
(17.3-18.1)
16-18
(6.3-7.1)
55-65
(21.7-25.6)
20-30
(7.9-11.8)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class D Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
42-44
(16.5-17.3)
21-23
(8.3-9.1)
65-70
(25.6-27.6)
20-25
(7.9-9.8)
650/652
51-53
(20.1-20.9)
21-23
(8.3-9.1)
70-80
(27.6-31.5)
30-40
(11.8-15.7)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Class E Stainless Steel Rotors, x0.01 mm (x0.001in.)
600/602
50-52
(19.7-20.5)
25-27
(9.8-10.6)
75-85
(29.5-33.5)
25-35
(9.8-13.8)
650/652
58-60
(22.8-23.6)
25-27
(9.8-10.6)
95-105
(37.4-41.3)
35-45
(13.8-17.7)
677
CONTACT UNIBLOC-PUMP FOR CLEARANCES
Low Temp./High Pressure Applications