Heidolph ROTAVAC 20 - Manual (Page 27)

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 27 of 35 Translation of the original instructions
➨ Position valve heads, with hose nozzle, if applicable, con-
nection tube or connection fastener, and disc springs on
the valve seats. Position disc springs with large opening
downwards. Pay attention to the correct orientation of the
valve heads.
+ Center the valve head with respect to the valve seat. The
valve head must lie flat on the valve seat.
Valve head with gas ballast or hose nozzle connection:
➨ Insert square nut in the groove of the head cover or posi-
tion square nut in the groove and then screw on connec-
tion fastener.
+ Loosely fasten fillister head screw.
➨ Position clamping bracket with countersunk bores facing
upwards.
➨ Align the countersunk bores with the threaded pegs.
➨ Loosely fasten the countersunk screws and correct the
alignment of the valve heads if necessary.
➨ Tighten countersunk screws with Torx screwdriver T20.
+ Torque: 3 Nm.
➨ Bring the diaphragms into a position, in which they are in
contact with the housing and centered with respect to the
bore.
➨ Put on head cover with valve heads and connections at-
tached.
+ Pay attention to the correct orientation of the head cov-
ers:
Housing with head alignment pin: The head alignment pin
at the pump housing has to fit into the recess at the head
cover.
Housing with mark: Align the recess at the head cover with
the mark at the pump housing.
➨ Loosely screw in the Allen head screws at the head cov-
ers diagonally at first slightly with an Allen key size 5, then
tighten.
+ Recommended torque: 12 Nm.
➨ Slide the caps into the head cover.
Affix the connection tube to the other side of the pump, as well
as the hose connection to the inlet or outlet of the vacuum
system at the valve head.
➨ Slip connecting tube onto hose connection of valve head.
➨ Slide on the tube and the hose clip until touching the nose
at the valve head.
➨ Close hose clip with flat pliers.