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5.3 Steam applications
Observe the following points for applications
with steam:
− Before start-up, all pipes conveying the
process medium must be completely
drained and dry (to prevent steam ham-
mering).
− Before start-up, fill the compensation
chamber (10) with water (also at the pi-
lot valve, if necessary).
− Slowly start up the plant and allow time
for the pipes and valves to heat up.
− Air and condensate must be allowed to
escape from the plant. Install steam trap
or air vent for steam-operated systems at
a suitable location.
5.4 Adjusting the set point
Adjust the required set point while the plant
(consumer) is open by turning the set point
adjuster at the pilot valve (5).
When the adjusted downstream pressure (set
point) is reached, the pilot valve closes,
causing the main valve to close as well.
Turn clockwise (P):
–
To increase the pressure set point
Turn counterclockwise (Q):
–
To reduce the pressure set point
EB 2552-1 EN
The pressure gauge located on the down-
stream pressure side allows the adjusted set
point to be monitored.
First set the minimum set point by turning the
set point adjuster counterclockwise (Q).
Wait until the pressure reducing valve starts
to regulate before adjusting the set point by
slowly turning the adjuster clockwise (P).
NOTICE
!
Incorrectly adjusted set point or set point
cannot be adjusted.
Malfunction
Start by turning the set point adjuster by one
turn at a time and wait until the downstream
pressure reaches the set point. As soon as
the pressure reducing valve starts to work,
you can adjust the set point by making larg-
er changes. Wait several minutes until the
pressure conditions have stabilized and
check the set point. Correct the set point, if
necessary.
After start-up and set point adjustment,
avoid fast changes in pressure.
5.5 Decommissioning
Depressurize the plant. Close the shut-off
valves starting from the flow pipe (high-pres-
sure line).
Operation
13
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