Issue 02
Düker GmbH, www.dueker.de
7
5. Operation
The valve is shut by turning it clockwise and is opened by turning it in the opposite direction. Manual power
suffices to operate the valves. Use of extensions to increase actuating torque is not permissible, since this
will cause damage to the valve.
Operating torques
The stated operating torques are the max. permissible torques for full differential pressure at the actuating
stem, these are described in EN 1074-2.
nominal diameter
DN
max.
operating torque
as per EN 1074-2
MOT Nm
no. of turns for
closing
stem square
mm
80
80
16
17
100
100
20
19
150
150
30
19
200
200
34
24
250
250
42
27
300
300
51
27
6. Service and Maintenance
The valves do not require regular maintenance work. However, when a pipeline section is inspected, the
valve may not show any leakage to the outside.
The valve should be checked for tightness and proper function at least once per year.