Heidolph ROTAVAC valve control Instruction Manual page 63

Explosion drawing: pump head
housing
piston rod
diaphragm back-
up ring
Loosen 4 ea. machine hex-recessed bolts on pump heads
and lift off upper half (lid with internal part)
Never attempt to loosen parts with sharp tools
(screwdriver), use rubber hammer or compressed air
instead.
To inspect valves carefully detach lid from internal part;
denote location of valves and remove valves.
Replace damaged valves.
Remove contamination with cleaning agent.
Inspect diaphragm for damage, replace on condition. To
this end remove data plate with 4 ea. Phillips screws.
lid, inside
lid
63
diaphragm
diaphragm cocking spring with
square-head bolt
cover
valve
E