Igema NA7-50, Installation And Operating Instructions Manual

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 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.
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)
clockwisely until valve is tight. Spindle (4) has to 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).
Replacement of complete upper part:
 For dismounting of component parts see “Replacement of packing”
 Unscrew seat (3) with hexagon socket wrench SW11.
 Grease seat thread, screw in and tighten with tightening torque M
d
= 55 Nm .
 Replace complete upper part.
 Place new spindle.
 For assembly of component parts see above.
11. Spare parts
Always indicate article no. and serial no. (indicated on the identification plate) in case of
spare parts order!
11.1 Magnetic level gauge