2867 S. Vail Avenue, Commerce, CA 90040
Phone: 323-890-4455
Fax: 323-890-4456
Butterfly Valve Installation Procedure - For Lug & Wafer Style Valves
Always position the connecting pipe flanges accurately in the line, allowing sufficient space between the flanges for the
valve. Make sure the pipe flange faces are clean of any foreign material such as scale, metal shavings or welding slag.
Valves should be installed with the disc in the closed position to prevent damage to sealing surfaces or the disc.
1. Carefully insert the valve between the pipe flanges. Do not apply any lubricants to the seat faces as this may damage them.
2. Line up, center and secure the valve between flanges using desired bolts or studs as listed in Table 2.
Do not tighten bolts at this time.
3. Carefully open the valve to assure free unobstructed disc movement. Disc interference may result when
valves are installed in pipelines having smaller than normal inside diameters, such as heavy wall pipe,
plastic-lined pipe, as-cast flanges or reducing flanges. Interference can also occur when connecting directly
to swing check or silent check valves. Suitable corrective measures must be taken to remove these
obstructions, such as taper boring the pipe or installing a spacer or spool piece.
4. After proper operation is verified, tighten the bolts to the minimum recommended
bolt torques listed in Table 1 below using a cross-over pattern.
5. Pressurize piping to valve and inspect for leakage. If leakage is observed, tighten bolts using cross-over pattern, increasing
torque until leak stops. DO NOT EXCEED MAXIMUM TORQUES LISTED IN TABLE 1.
6. Recommended torques are made without warranty. Installer must verify proper strength bolts for application. Bolts shall be
clean and un-lubricated.
Caution
1. Class 250 cast iron and Class 300 steel flanges can not be used on these valves.
2. Rubber faced or mechanical flanges are not recommended.
3. This valve is not recommended for steam service.
4. Valves should not be assembled to the flanges and then welded into the piping system.
5. Lever-lock handles are not recommended for use on 8" and larger valves.
6. Do not install EPDM liner in compressed air lines.
Table 1 Recommended Bolt Tightening Torque
Flange Bolt
Minimum Bolt Maximum Bolt
Size
Size Torque (ft.•lbs.) Torque (ft.•lbs.)
2"- 4"
5/8"
20
70
5"- 8"
3/4"
30
120
10" & 12" 7/8"
50
200
14" & 16"
1"
70
240
18" & 20" 1-1/8"
100
380
24" & 30" 1-1/4"
140
520
36"- 48" 1-1/2"
200
800
Page 2
January 28, 2014
6.57
36"
8.00
42"
9.88
48"
10.87
0.63
—
0.69
—
0.75
—
0.94
0.94
1.00
1.12
1.19
1.25
1.38
1.44
1.56
1.69
1.88
2.12
—
—
—
2.38
—
—
—
2.62
—
—
—
2.75
—
—
—
—
0.75
—
0.88
—
0.94
0.94
0.94
1.00
1.12
1.19
1.25
1.38
1.44
1.56
1.69
1.88
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.94
—
—
—
3.56
—
—
—
3.81
—
—
—
4.25
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.75
—
—
—
2.06
—
—
—
2.31
—
—
—
2.56
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.00
—
—
—
2.31
—
—
—
2.69
—
—
—
3.06
—
1.25
1.50
1.50
1.75
1.50
1.75
1.75
1.75
2.00
2.25
2.25
2.50
2.50
3.00
3.00
3.50
4.00
3.50
3.00
3.50
4.25
4.00
3.50
4.00
5.00
4.50
4.00
4.50
5.50
4.50
4.50
5.00
6.00
4.00
4.00
5.00
5.00
5.00
5.00
5.00
5.00
6.00
6.00
7.00
7.00
7.00
8.00
9.00
10.00
11.00
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8/4
8/4
8/4
8/4
8/4
8/4
16/8
16/8
16/8
16/8
24/12
24/12
24/12
32/16
32/16
40/20
40/20
56
56
56
56
64
64
64
64
72
72
72
72
88
88
88
88
CAP SCREW SIZE
30"
TOTAL QUANTITY CAP
SCREWS/BOLTS (TO
MOUNT 2 FLANGES)
2.06
2.19
2.19
2.38
2.69
3.00
3.01
3.38
4.12
5.14
5.98
RECOMMENDED
BOLT LENGTH
(WAFER VALVES)
DIMENSION "X"
1.81
4"
5"
6"
8"
10"
12"
14"
16"
18"
20"
24"
RECOMMENDED CAP
SCREW LENGTH
(LUGGED VALVES)
DIMENSION "Y"
3"
ANSI B16.47 (SERIES B)
CLASS 150 STEEL
BLIND STYLE
FLANGE THICKNESS
1.81
ANSI B16.47 (SERIES B)
CLASS 150 STEEL
WELD NECK
FLANGE THICKNESS
2 1/2"
ANSI B16.47 (SERIES A)
CLASS 150 STEEL MSS
SP-44
FLANGE THICKNESS
1.69
ANSI B16.5
CLASS 150 STEEL
FLANGE THICKNESS
TOTAL VALVE
BODY WIDTH
2"
ANSI B16.1
CLASS 125 CAST IRON
FLANGE THICKNESS
VALVE SIZE
1000/2000/3000
SERIES ONLY
Butterfly Valve Installation Procedure - For Lug & Wafer Style Valves
5/8-11 UNC
5/8-11 UNC
5/8-11 UNC
5/8-11 UNC
3/4-10 UNC
3/4-10 UNC
3/4-10 UNC
7/8-9 UNC
7/8-9 UNC
1-8 UNC
1-8 UNC
1 1/8-7 UNC
1 1/8-7 UNC
1 1/4-7 UNC
1 1/4-7 UNC
1 1/2-6 UNC
1 1/2-6 UNC
1 1/2-6 UNC
Table 2 Recommended Bolt Lengths
Suggested Bolting Methods
X
Y
Care & Maintenance:
No regular maintenance is required on SCI butterfly valves, but it is advisable to “exercise” the valve
from full open to full closed and back to verify that the valve is functioning properly.
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