ARI Armaturen STEVI 446 EN - Manual (Page 10)

Page 10 Rev. 0040301000 0410
Operating and installation instructions
Str. thr. control valves - STEVI
®
440 / 441, 445 / 446
5.2 Requirements at the place of installation
The place of installation should be easily accessible and provide ample space for
maintenance and removing the actuator. Stop valves should be installed before and after
the control valve to enable maintenance working without draining the piping system. The
valve should preferably installed vertically with the actuator at the top. Inclined or horizontal
installation without supports is permissible only with light actuators.
For this installation position, the two distance columns (or joke) have to be above each
other in the vertical plane.
Permissible actuator weights for valves with unsupported horizontal stems:
The pipes must be lagged to protect the actuators from excessive heat. Sufficient space
must be left for the maintenance of the stem packing.
To ensure that the control valves function correctly, the pipe run should be straight for at
least 2 x n.d. upstream and 6 x n.d. downstream of the valve.
Fig. 16: Pipeline vertically Fig. 17: Pipeline horizontally
20 kg for DN 15 - 32 55 kg for DN125v-150v
(only series 445/446)
25 kg for DN 40 - 65
35 kg for DN 80-100
55 kg for DN200-250
40 kg for DN125-150