HG1
7 Maintenance and repair
WARNING
Hazardous media
Work on parts in contact with hazardous media may only be carried out with appropriate protective
equipment.
CAUTION
Pipelines are under pressure
a) Before removing the valve make sure that the pipe section is depressurised and evacuated.
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In case of toxic, caustic and other outgasing media the pipe section must also be ventilated.
NOTICE
Qualified persons
Work on the valve may only be carried out by qualified and authorised persons.
7.1 Maintenance
DANGER
There is an acute danger to life when opening a pressurized valve!
Opening of screw connenctions, limit switches, manual overrides or auxiliary equipment when the
valve is under pressure may result in eruption of the fluid and damage to the valve.
The valves of GEFA Processtechnik GmbH are as far as possible maintenance-free. However, for operational
safety reasons, all valves should nevertheless be checked regularly, for example by assessing the external con-
dition and their accessories. Valves should generally be operated regularly in order not to impair the proper op-
eration of all moving parts due to excessive downtimes. Maintenance intervals are to be determined by the op-
erator according to the conditions of use.
A routine maintenance or lubrication of the valve is not necessary.
7.2 Tighten/Replacing the Gland Packing
Should a leakage occur at the gland packing, retighten the gland nut(1.11)*. Take care that the gland nut is not.
Normally the leakage can be stopped by simply turning the nut by a quarter.
If the leakage cannot be stopped using the above method, the gland packing must be replaced. For replacing
the gland packing the valve needs not to be removed from the pipeline. Follow the steps below to safely change
the stuffing box packing.
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Check whether the pipeline has been rendered depressurized and is empty.
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Remove the operating element. See chapter Mounting the hand lever and chapter Installing the MULTITOP
mounting plate-
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Loosen the fixing devices(1.13)* of the limit stop and lift off the limit stop.
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Loosen the fixing devices(1.10, 1.11)* of the gland flange and lift off the gland flange (1.9)*.
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Remove the gland(1.8)*. A groove in the upper part of the gland makes the removal easier.
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Remove the packing rings (1.7)* and thoroughly clean the packing area.
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Insert a new packing set, whereby it is to be ensured that the correct packing material is used.
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Insert the gland, place the gland flange on top and fix it using the screws and nuts.
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Tighten the nuts reciprocally so that the gland flange is not tilted. Only slightly tighten the nuts until the leak-
age is stopped.
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Reinstall the operating element.
*(See chapter 3 "Scope of delivery")
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Version 0 • Dokument-Nr. 74572811
Internet: www.gefa.com • E-Mail: [email protected]
