21
Leaders in Sealing Integrity
– Thoroughly clean the connecting end and the adjoining piping system, ensuring the lining is not damaged
by debris.
– The connecting ends of the piping must be flush and plane parallel.
4.3 Installation
– GARLOCK butterfly valves can be fitted regardless of the direction of flow and position of the butterfly
valve stem.
– The angle between the butterfly valve and pipe axle can be freely set by the user. It is, however,
recommended that they be fitted with the shifter shaft horizontal, especially for media containing solids;
the bottom part of the disc will then open in the direction of flow. The position of the disc is indicated by the
dihedral (DN 50 to DN 300) or the feather key groove (
≥
DN350) if the shaft end is open, by the hand lever
if one is fitted, and by a position indicator if a worm gear is fitted.
– The disc must be partially open when the butterfly valve is fitted.
– The butterfly valve must be carefully centred when being fitted.
– The applicable standards must be observed for the tightening torques of the flanged connection. Boundary
conditions such as temperature, pressure, type of screws, lubrication of screws, type of flanges etc. must
also be taken into account. The values in the table below can be used as a guide.
Attention
Connecting ends of the piping that are not flush / not parallel may damage the lining of the
valve.
Attention
Exactly center Garlock valves and install with slightly opened valve disc (transport position
approx. 10°).
By means of test switching, ensure that the valve disc is freely movable and that the valve disc
does not drive against the inside edges of the flange when opening.
Attention
Tighten flange screws evenly and crosswise with a spanner.
Tightening torques according to the following table ensure sufficient crimping forces for secure
outward sealing.
DN
Inch
2
2½
3
4
5
6
8
10
12
14
16
18
20
24
mm
50
65
80
100
125
150
200
250
300
350
400
450
500
600
A
mm
43
46
46
52
56
56
60
68
78
92
102
114
127
154
C
mm
43
53
67
93
115
147
188
236
284
322
374
415
467
558
Danger
The inside diameter of the piping (flanges) must be bigger than the part of the valve disc, which
in an opened position extends over the valve, ensuring the valve disc is not damaged when
moving outward. See measurement C of the following table.
If necessary, use intermediate rings.
Attention
The installation space between the flanges must provide sufficient clamping width = width of
the body lining. See measurement A of the following table.
If necessary, use intermediate rings.
Summary of Contents for GAR-SEAL
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