21
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 11.4)
•
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!
Re-tightening of gland packing:
•
If a valve is leaky, tighten screw cap (8) with open-end wrench (AF27) 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
d
=
220 Nm
.
•
Place handwheel (11) and tighten cap nut (13).
Danger
Summary of Contents for NA7-130
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