Manual Override; Commissioning - Gemü Rsk Betriebsanleitung

10. Installation with vertical flow is only permissible if the
check valve can open upwards. The flow direction arrow
on the valve must point upwards.
11. If the medium flows horizontally through the check valve,
the eye bolt must point upwards.
12. Put one washer onto each of the flange bolts.
13. Insert two flange bolts through the lower flange holes.
These can act as a holder for the valve when in the install-
ation position with a horizontal flow direction.
14. From the other side, put one washer onto each of the
flange bolts and place one nut on each.
15. With metal seated valves (without O-rings in the body), the
operator is responsible for providing a suitable flange con-
nection seal. This should be centred with the valve
between the flanges.
16. Insert the valve between the flanges using the eye bolt.
Here, the installation notes on the following pages must
be observed in accordance with the flow direction.
17. When being installed in horizontal piping, the valve can be
placed on the two flange bolts.
18. Insert the remaining flange bolts into the flange holes.
19. Insert the remaining washers onto the flange bolts from
the other side.
20. Position the remaining nuts on the flange bolts.
21. Centre the valve between the flanges using the eye bolt.
22. Tighten the flange bolts to the appropriate torque in a di-
agonal pattern.
Flange bolt tightening torques
Thread
M12
M16
M20
M24
M27
* The specified tightening torques are to be seen as guide values
since they depend on various factors, e.g. material and property class
of the bolts or the flange seal used.
www.gemu-group.com
Torque [Nm]*
20
35
60
100
165

10 Manual override

A manual override is available for nominal sizes DN 50–300.
The manual override is actuated by an Allen key. The Allen key
is not included in the scope of delivery.
● Insert the Allen key in the manual override and turn by the
required angle (max. 90°).

11 Commissioning

Corrosive chemicals!
▶ Risk of caustic burns
●
●
●
Leakage!
▶ Emission of dangerous materials
●
1. Check the tightness and the function of the product (close
and reopen the product).
2. Flush the piping system of new plant and following repair
work (the product must be fully open).
ð Harmful foreign matter has been removed.
ð The product is ready for use.
3. Commission the product.
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11 Commissioning
WARNING
Wear appropriate protective gear.
Completely drain the plant.
Completely decontaminate the plant.
CAUTION
Provide for precautionary measures
against exceeding the maximum per-
missible pressure that may be caused
by pressure surges (water hammer).
GEMÜ RSK