Main Shutoff Valve (C, G) - Igema G Installation And Operating Instructions Manual

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Remove vent plug (a) and plug (n) of indicator valve which should be maintained (h or j).
Unscrew upper part of valve (5) with valve spindle (10).
Replacement of seat (2) and cone set (3):
Replace cone set (3).
Unscrew seat with hexagon socket wrench SW 10 and replace.
Tightening torque Md = 70 Nm.
Replacement of stuffing box packing (7):
Loosen screw cap (9) and unscrew valve spindle (10) clockwisely from thread of upper part
of valve (5).
Loosen handwheel (11) and push valve spindle (10) out of stuffing box packing (7).
Carefully remove deposits on valve spindle.
Take off screw cap (9) and gland (8) and push out stuffing box packing to be replaced over
base ring (6).
Assembly in following order:
Screw in valve spindle (10), insert base ring (6) - stuffing box packing (7) - and gland (8),
place and tighten screw cap (9).
Fix handwheel (11). Tighten valve spindle (10) counterclockwisely in upper part of valve (5)
as far as it will go.
Insert upper part of valve (5) with valve spindle (10) and new sealing ring (4) in valve housing
(1) and tighten.

11.4 Main shutoff valve (c, g)

Carry out maintenance works only if boiler is pressureless and empty
below valve stud.
Danger
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Loosen nut (12) and remove upper part of valve (5) with valve spindle (10).
Replacement of seat (2) and cone (3):
Cone parts (2.1, 2.2, 2.4) loosen cone halves (2.1, 2.4) which are screwed together.
Unfasten pinned clamping nut (2.3) and remove cone half.
Assembly with parts to be replaced in reverse order:
See detail for assembly of cone halves (2.1, 2.4) and sealing ring (2.2).
Screw cone halves (2.1, 2.4) together.
Remove seat with special wrench and replace.
Tightening torque Md = 100 Nm.
 Replacement of gland packing (7) as described under 10.3.
Insert upper part of valve (5) with new sealing (4) and tighten nuts (12 ) using successively
opposite diagonal tightening. Tightening torque Md = 60 Nm.
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