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11.3 Commissioning
Rust, sand or similar impurities inside of the medium or during first flushing can cause
leakage if they remain in the area of the seat.
Purging of valve:
•
Fully open valve for purging. The pre-pressed gland packing can lose its denseness due
to a longer storage (see chapter 10.4)
•
Close valve.
11.4 Maintenance
Before carrying out maintenance works on drain valve, unit has to be
pressureless and empty!
Severe burns and scalding's on the whole body are possible!
Danger
Re-tightening of gland packing:
•
If a valve is leaky, tighten screw cap (8) with open-end wrench (SW27)
clockwisely until valve is tight. Spindle (4) must stay movable.
•
Replace gland packing if re-tightening of packing was not successful.
Replacement of packing:
•
Screw off cap nut (13) and remove handwheel (11).
•
Unscrew upper part of valve (10).
•
Remove screw cap (8) and stuffing box (7).
•
Remove spindle with cone (4) upwards.
•
Push out gland packing (6) with scraper rings (5) from top and clean packing space.
Assembly:
•
Grease spindle thread insert from top and firmly tighten screws.
•
Place new greased packing with scraper rings (5).
•
Insert stuffing box (7).
•
Tighten screw cap (8).
•
Insert new sealing ring (9).
•
Grease thread of upper part of valve (10), screw in and tighten with tightening torque M
= 220 Nm.
•
Place handwheel (11) and tighten cap nut (13).
d
21
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