Heidolph ROTAVAC 20 - Manual (Page 23)

Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 01-005-005-36-1
page 23 of 35 Translation of the original instructions
The replacement of the diaphragm and the replacement of the valves can be carried out separately.
+ To replace the valves, remove the head covers of one side of the pump along with the assembled
valve heads and fittings.
+ To maintain the diaphragms, the valve heads and the fittings need not be disassembled. The head
covers can be removed along with the assembled valve heads and fittings.
10
1
9
3
2
5
6
7
8
11
18
20
13
12
14
19
16
21
17
22
15
4
View of the disassembled pump head parts
11: Square nut
12: Fillister head screw
13: O-ring
14: Valve
15: Valve head
16: Hose nozzle
17: Connection fastener
with hinged cover
18: Disc spring
19: Clamping bracket
20: Countersunk screw
21: Hose clip
22: Connection tube
1: Head alignment pin / mark
2: Connecting rod
3: Housing
4: Washer
5: Diaphragm support disc
6: Diaphragm
7: Diaphragm clamping disc
with square head screw
8: Allen screw
9: Cap
10: Head cover
6.1 Cleaning and inspecting the pump heads