KSB SICCA GLS Series, Operating Instructions Manual

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SICCA
5.3 Sectional drawing & functioning principle
5.3.1 Sectional drawing - Gate Valve
5.3.2 Gate valves (Class 900, 1500, 2500)
The valve consists mainly of body (100), bonnet (162), yoke
(139) as well as wedge and stem (200) and the actuating unit.
Stem seal area : The gland packing (461) which seals the
stem (200) is tightened by the studs (902.2) and nuts (920.2)
on the gland flange (452). The bonnet (166) is equipped with
an integral, hard faced back seat, which seals the valve while
stem is in upmost position.
Flow seal area : The seat rings (515) are seal welded into the
body (100). The wedge unit consists of two hard faced discs
(350) which can pivot on the disc holder (367). The discs are
supported by replaceable thrust inserts held by a pin. The discs
are secured from turning by a retaining element at the bottom
of the stem (200). The double disc wedge unit is screwed on
the stem (200) and guided by lateral rails in the body (100).
Bonnet seal area : The valve is equipped with a pressure seal
bonnet. The bonnet (166) is pressed against the gasket (411) by
the pressure in the valve body (100). The gasket is supported
by the spacer ring (500) and the segmental thrust ring (501)
which is seated in a groove of the body (100). The gasket is
precompressed between disc thrust plate and bonnet (166) by
means of the studs (902.1) and nuts (920.1).
GTC 900-2500 GTC 150-600
4
5.3.3 Gate valves (Class 150, 300, 600)
The valve consists mainly of body (100), bonnet (166) as well
as wedge (361) and stem (200) and the actuating unit.
Stem seal area : The gland packing (461) which seals the
stem (200) is tightened by gland bolts (900) and nuts (920.2)
on the gland flange (452). The bonnet (166) is equipped with
a back seat bushing (450) which seals the valve while stem is
in upmost position.
Flow seal area : The hard faced seat rings (515) are welded
into the body (100). The seal faces of the flexible wedge (361)
are hard faced. The wedge (361) is connected to the stem
(200) by a “T” joint. The wedge is guided by lateral rails in the
body (100).
Bonnet seal area : Body (100) and bonnet (166) are connected
to each other by studs (902) and nuts (920.1). Tightness is
assured by means of the gasket (411).
Type Size Class Type leaflet no.
GTC 150-600 2”-24” 150-600 7244.1/02-EN
GTC 900-3600 2”-28” 900-3600 7241.1/02-EN
Related documents
162
100 Body
139 Bonnet
162 Yoke
162 Bonnet (L.P.)
196 Locking plate (Lock nut)
200 Spindle / Stem
324 Thrust Bearing
334 Bearing cover /
Adapter plate
334 Bearing cover /
Bearing retainer
361 Wedge
Part no. Name Part no. Name Part no. Name Part no. Name
367 Disc holder
411 Gasket
450 Back Seat Bush
452 Gland flange
456 Gland bush
457 Neck ring
461 Moulded gland packing
461 Braided gland packing
501 Thrust ring
504 Spacer ring
508 Wedge retaining ring
514 Bonnet bush
515 Seat ring
544 Stem nut / Threaded bush
550 Disc
553 Thrust plug / Thrust insert
560 Pin (Disc holder)
563 Pin (Thrust insert)
583 Supporting plate /
Bonnet retainer
636 Grease nipple
901 Hex. screw
902.1 Stud-1
902.2 Stud-2
904 Grub screw
914 Socket head cap screw
920.1 Nut-1
920.2 Nut-2
921
Shaft nut /
Handwheel nut
926 Spindle head nut
(Stem stop nut)
940 Key
961 Handwheel
501
411
324
515