10.4 Maintenance
Before carrying out maintenance works on drain valve, unit has to be
pressureless and empty!
Severe burns and scaldings on the whole body are possible!
Re-tightening of gland packing:
If a valve is leaky, tighten screw cap (8) with open-end wrench (SW27)
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clockwisely until valve is tight. Spindle (4) has to stay movable.
Replace gland packing if re-tightening of packing was not successful.
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Replacement of packing:
Screw off cap nut (13) and remove handwheel (11).
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Unscrew upper part of valve (10).
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Remove screw cap (8) and stuffing box (7).
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Remove spindle with cone (4) upwards.
Push out gland packing (6) with scraper rings (5) from top and clean packing
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space.
Assembly:
Grease spindle thread, insert from top and firmly tighten screws.
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Place new greased packing with scraper rings (5).
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Insert stuffing box (7).
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Tighten screw cap (8).
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Insert new sealing ring (9).
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Grease thread of upper part of valve (10), screw in and tighten with
tightening torque M
Place handwheel (11) and tighten cap nut (13).
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Replacement of complete upper part:
For dismounting of component parts see "Replacement of packing".
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Unscrew seat (3) with hexagon socket wrench SW11.
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Grease seat thread, screw in and tighten with tightening torque M
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Replace complete upper part.
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Insert new spindle.
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For assembly of component parts see above.
= 220 Nm.
d
= 55 Nm.
d
17