Troubleshooting Help - Mankenberg NV 93 Betriebsanleitung

10 Troubleshooting help

Be sure to observe Section 3 <Safety instructions> when rectifying faults.
Spare parts must be ordered with all the details on the nameplate.
Only original parts from the manufacturer MANKENBERG may be installed.
MANKENBERG experts are available to help in rectifying faults as quickly as possible.
See Section 11 <Further information> for the addresses.
If functional or corrosion damage is detected during maintenance or after a fault:
consult MANKENBERG to find out whether a more suitable fitting is available or whether
the damaged part can be supplied in a better-suited material.
note
Type of fault
Leakage at a connection of
body parts
(flange or clamp ring):
reseal connection
Functional fault
Leakage at the seat
clean functional parts
Action
Tighten the screws clockwise (tighten flange screws crosswise).
If the screws of the body connection have to be loosened or removed
(= unscrewing in the anticlockwise direction):
To prevent any risk for operating personnel, make sure that this repair
measure is only carried out on a section of pipe that is not under pressure.
Take note of Section 3.3 <Special hazards> and then section
5 <Installation in the pipeline>.
Possible reasons:
- A foreign object may be jammed in the seat and be preventing proper
sealing.
- or float/lever are to heavy or moving to heavy due to dirt, deposits or
corrosion
Repeatedly open and close the valve by manually operating the float lever
If leakage cannot be eliminated:
Cleaning is necessary: the float valve must be dismantled.
To prevent any risk for operating personnel, make sure that this repair
measure is only carried out on a valve that is not under pressure.
Take note of Section 3.3 <Special hazards>.
When the valve is not under pressure and the vessel has been (partly)
emptied, take off the float valve by releasing the screw connections at the
valve and dismantle the valve, the float and the lever for cleaning.
Here all parts of the maintenance set should be renewed.
Afterwards, assemble the valve and reinstall it in the vessel and check for
free movement of float and lever.
- 9 -
danger of fatalities
danger of fatalities
© 2020 MANKENBERG GmbH