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5.2 Installation conditions
Work position
The work position for the regulator is the
front view onto all operating controls on the
regulator (including any additional fittings)
seen from the position of operating person-
nel.
Plant operators must ensure that, after instal-
lation of the device, the operating personnel
can perform all necessary work safely and
easily access the device from the work posi-
tion.
Make sure the following conditions are met:
Î Install a strainer upstream of the regula-
tor (see section 5.3).
Î Make sure the direction of flow matches
the direction indicated by the arrow on
the body.
Î Install the regulator free of stress.
Î On insulating the valve, do not insulate
the actuator and the coupling nut as well.
Make sure the permissible ambient tem-
perature is not exceeded, especially at
the actuator stem (10.1). If necessary, an
intermediate insulating piece (order no.
1992-3132) must be used. The insulat-
ing limit is in this case approx. 25 mm
above the top of the valve body.
Î Observe the minimum differential pres-
sure across the plant (see Table 1).
EB 3135-1 EN
The minimum differential pressure is calculat-
ed as follows:
∆p
= ∆p
min
Minimum differential pressure across the
∆p
min
valve in bar
Differential pressure created at the
∆p
restriction for measuring the flow rate in
restriction
bar
.
V
Flow rate, adjusted in m³/h
K
Valve flow coefficient in m³/h
VS
NOTICE
!
Possible malfunction and damage due to ad-
verse weather conditions (temperature, hu-
midity).
− Do not install the regulator outdoors or in
rooms prone to frost.
− Protect the regulator against frost if it is
used to control freezing media.
− Either heat the regulator or remove it from
the plant and completely drain the residual
medium.
Mounting position
To ensure that the regulator functions proper-
ly, proceed as follows:
Î For regulators DN 15 to 25:
Installation into horizontal and vertical
pipes.
Î For regulators DN 32 to 50:
Install the regulators in horizontal pipe-
lines.
Î The electric actuator must be mounted
above the valve body.
Assembly
∙
) ²
+ ( V/K
restriction
VS
25
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