VAG Operating and Maintenance Instructions • 5
4.4 Assembly instructions and fittings
The valve is bidirectional and therefore can be installed in any in-
stallation position.
Check the valve for any possible transport or storage damage be-
fore installation. Protect the valve against dirt on site by ade- qua-
te covering until installation.
When the valve is being installed, the functional parts such as the
stem, stem nut, gasket and knife must be free from dust and dirt.
For the installation of the ZETA
®
Knife Gate Valve you will need
adequate load suspension devices (e.g. ring bolt in the blind hole)
as well as transport and lifting equipment. Lifting the valve for ex-
ample at the handwheel may lead to damage and impairment of
its function.
When repainting the valve, make sure that no functional parts
such as the stem, stem nut, gasket, knife or piston rod are cover-
ed by the paint.
When installing an extension rod to the valve, mount it perpendi-
cularly to the stem axis above the fixing point.
When installing an extension rod to the valve, mount it perpendi-
cularly to the stem axis above the fixing point.
When connecting the valve to the pipeline flanges with through-
holes, use hexagon head screws and nuts with washers on both
sides from flange to flange.
When connecting the valve to the pipeline flanges with blind th-
read holes, use stud bolts with washers and nuts for a safe and
reliable installation (see example 3 at fig. 3). Screw the stud bolts
completely to the ground of the blind thread holes of the valve.
This guarantees an optimum connection, as the threads are used
over their whole effective depth. Then align the valve with the flan-
ge by using the stud screws as orientation pins.
Using hexagon head screws in case of blind thread holes can lead
to leaky connections (see example 1 and 2 at fig. 3).
Fasten the screws carefully and evenly crosswise, thus preven-
ting unnecessary tensions and cracks or fractures.
The pipeline must in no case be pulled towards the valve. If the
gap between the valve and the flange is too wide, this should to
be compensated by thicker gaskets.
We recommend steel-reinforced rubber gaskets accor-
ding to DIN EN 1514-1 shape IBC for sealing. If the flan-
ges are crimped, these gaskets must be used.
For the kind and the sizes of the required connection parts
for each kind of installation (as wafer type in-between two
flanges or for pipeline end installation), see the following
tables (Table 1 and Table 2).
Flanges
Wafer-type
Connecting dimensions acc. to DIN EN
1092-1 Typ 11
Blind thread hole
l
Through hole
¡
DN
bolt circle
&
flange outside
&
thread height
T
Threaded pin DIN 939
Hexagon nut
DIN 939
Hexagon head
screw
DIN EN 24014
Hexagon nut
DIN 934
qty
dimension
qty
size
qty
dimension
qty
size
50
125
165
10
8
M16 x 35
8
M16
-
-
-
-
65
145
185
12
8
M16 x 35
8
M16
-
-
-
-
80
160
200
12
8
M16 x 40
8
M16
4
M16 x 120
4
M16
100
180
220
14
8
M16 x 40
8
M16
4
M16 x 130
4
M16
125
210
250
15
8
M16 x 45
8
M16
4
M16 x 130
4
M16
150
240
285
15
8
M20 x 45
8
M20
4
M20 x 130
4
M20
200
295
340
15
8
M20 x 45
8
M20
4
M20 x 150
4
M20
250
350
395
17
16
M20 x 50
16
M20
4
M20 x 160
4
M20
300
400
445
22
16
M20 x 55
16
M20
4
M20 x 170
4
M20
350
460
505
22
20
M20 x 55
20
M20
6
M20 x 170
6
M20
400
515
565
26
20
M24 x 60
20
M24
6
M24 x 200
6
M24
500
620
670
30
28
M24 x 65
28
M24
6
M24 x 220
6
M24
600
725
780
32
28
M27 x 70
28
M27
6
M27 x 260
6
M27
700
840
895
27
32
M27x80
32
M 27
8
M27 x 300
8
M 27
800
950
1015
30
32
M30x90
32
M 30
8
M30 x 320
8
M 30
900
1050
1115
30
36
M30x90
36
M 30
10
M30 x 340
10
M 30
1000
1160
1230
33
36
M33x100
36
M 33
10
M33 x 360
10
M 33
1200
1380
1455
36
48
M36x110
48
M 36
8
M36 x 440
8
M 36
1400
1590
1675
39
52
M39x120
52
M 39
10
M39x500
10
M39
Table 1: Connection parts for flange connection, wafer type
Connection parts for flange connection, wafer type
Lengths of screws are for pre-welded flanges acc. to DIN EN 1092-1, PN 10 type 11, washers acc. to DIN 125 (ISO 7090).DN 50...600: Flat gaskets acc. to DIN EN 1514-
1 / PN 10 / shape IBC, thickness 3 mm; DN 700...1400: Flat gasket according to DIN EN 1514-1 / PN 6 / shape IBC, thickness 8 mm, (flange sealing face PN 6)
T
T
DN 700...1400
DN 50...600
Wrong
Wrong
Right
Picture 3: Assembly of the VAG ZETA
®
Knife Gate Valve
