Valve attachment
15
4.4
Insulating flange
When using an insulating flange, heed the length of the screws used. They must not
be too long; otherwise the insulating caps within the flange or even the flange as such
will be damaged. We therefore recommend using studs according to DIN 938 with a
depth of thread of 1 x D (refer to figure Insulating flange [}15]). A remaining width of
joint of 0 mm must not be fallen short of.
Caution: Isolating spark gaps for lightning conditions between multi-turn actuator and
pipeline are not part of the DREHMO delivery! A potential supplier is the DEHN com-
pany, product TFS [Trennfunkenstrecke, German for isolation spark gaps].
NOTICE
Risk of damage at insulating flanges when using motors with mounted
terminal box (standard motors) and horizontal mounting position!
à Due to the limited permissible forces at the insulation flange, a horizontal mounting
position is not permitted for standard motors (with separate terminal box).
Figure9: Insulating flange
[1] Input mounting flange [2] Insulating body
[3] Output drive flange [4] Stud
[5] Insulating caps [6] Remaining width of joint (> 0 mm)
4.5
Rain protection hood
For HEW-RUF motors, the rain protection hood [2] is always used in combination with
the fan cover [1] ( refer to Rain protection hood [}16]). This is the responsibility of
the supplier! The hood must only be disassembled at the customers’ for upward
mounted shafts (protection hood points downward). For this, the fan cover [1] must be
disassembled first. After this, the rain protection hood [2] with positive connection can
be removed. For this, straighten the four lugs [3] using appropriate universal pliers or
similar. Finally, the fan cover [1] must be refitted.
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