DeZurik KGC-BD Instrukcja obsługi - Strona 6
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2-36" KGC-BD BI-DIRECTIONAL KNIFE GATE VALVES WITH GUIDES
Installation
Install the valve between ASME Class 125 or Class 150 pipeline flanges, or other flanges that match
valve end connection. Flange gaskets are required. Before installation, remove foreign material such
as weld spatter, oil, grease, and dirt from the valve and pipeline.
Normal Installations
The bi-directional KGC-BD knife gate valve can be oriented either way in the pipeline. The perimeter
seat in the valve will seal the valve in the closed position in both directions.
The bi-directional KGC-BD knife gate valves are not intended for gravity (dry) service applications.
General Guidelines
Observe the following points to prevent distortion of the valve body and gate when the flange bolts are
tightened:
Align the mating pipeline flanges.
Select the length of the flange bolts so that the bolts used in the blind holes near the chest
area of the valve do not bottom out when tightened. We recommend using studs with nuts in
the blind holes.
Tighten the flange bolts evenly, in a
crisscross pattern. Refer to Table A for
recommended flange bolt/stud torques.
Note: Torque ranges are based on ASME
Pressure Vessel Code Calculations and lab
test data. These torques are only for the listed
gasket types. For other gasket types listed in
ASME, consult DeZURIK.
After installing the valve, pressurize pipeline and
ensure the packing is not leaking. If the packing
leaks, adjust the packing as described on the next
page.
D11050
Table A: Recommended Flange Bolt/Stud
Torque Range in ft-lbs (non-lubricated)
Valve Size
2" (50mm)
3" (80mm)
4" (100mm)
5" (125mm)
6" (150mm)
8" (200mm)
10" (250mm)
12" (300mm)
14" (350mm)
16" (400mm)
18" (450mm)
20" (500mm)
24" (600mm)
26" (650mm)
28" (700mm)
30" (750mm)
32" (800mm)
36" (900mm)
Page 6
ASME Gasket Types
Rubber with
Soft Elastomer
Soft Fabric
Gasket Shore
Filler, & 1/8"
Durometer <
Thick Hard
75A
26 - 29
8 - 9
37 - 41
14 - 16
26 - 29
11 - 12
36 - 40
17 - 19
41 - 45
22 - 24
55 - 61
35 - 39
56 - 62
40 - 44
80 - 88
59 - 65
107 - 118
81 - 89
103 - 114
79 - 87
128 - 141
102 - 112
123 - 136
99 - 109
188 - 207
155 - 171
181 - 199
151 - 166
178 - 196
149 - 164
198 - 218
168 - 185
269 - 296
228 - 251
289 - 318
248 - 273
July 2018