Mankenberg UV 3.9 ATEX Originalbetriebsanleitung Seite 18

Original operating manual
Back pressure regulators UV 3.9 ATEX
Type of fault Action
Leakage on the The control mechanism (diaphragm, piston or bellows) is defective and has to be
bonnet: replaced:
Repair necessary, as described further below.
the valve must be
repaired
The pretensioned spring must be fully relaxed before a fitting is dismantled!
To prevent any risk for operating personnel, make sure that this repair measure is
only carried out when the fitting is not under pressure. Take note of section Special
hazards [} 7].
Functional fault A foreign object may be jammed in the seat and be preventing proper sealing:
Leakage at the seat - Pressure reducing valve DM: fully tighten spring
means the set inlet
- Backpressure regulator UV:fully release the tension of the spring
or outlet pressure is
not correctly
- Vacuum control valve: according to design, the abovementioned has to be
regulated:
observed
clean the
- Differential pressure control valve: according to design, the abovementioned has to
functional parts
be observed
- Flow control valve: je nach Ausführung o.g. zu beachtenaccording to design, the
abovementioned has to be observed
so that the valves open and foreign objects can be flushed out.
If the functional fault cannot be rectified in this way: Cleaning is necessary: the
pressure-reducing valve must be dismantled
Danger of fatalities The pretensioned spring must be fully relaxed before a
fitting is dismantled!
To prevent any risk for operating personnel, make sure that this repair measure is
only carried out when the fitting is not under pressure. Take note of section Special
hazards [} 7].
When the valve is not under pressure, take off the spring module by releasing the
clamp rings (or the screw connection) and dismantle the diaphragm (or piston/
bellows) and functional parts for cleaning. Here all parts of the maintenance set
should be renewed.
Afterwards, assemble the fitting and readjust it, as described under sectionInitial
start-up [} 14].
UV 3.9 ATEX-4.X.222 Issue 18.07.2022
Danger of fatalities
Danger of fatalities
18
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