Buying Guide

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Butterfly Valve Technical Information
Valve Installation Procedure
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.
1. Carefully insert the valves 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 4.
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 a swing check or silent check. 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 using a cross-over pattern (Fig. 1) to the minimum
recommended bolt torques listed in Table 3.
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 3.
6. Recommended torques are made without warranty. Installer must verify proper strength bolts
for application. Bolts shall be clean and un-lubricated.
4
2
1
3
8
6
5
7
Bolt Tightening
Cross Over Pattern
Fig. 1
Suggested
Bolting Method
Flange Bolt Minimum Bolt Maximum Bolt
Size Size Torque (ft.•lbs.) Torque (ft.•lbs.)
2 1/2"- 4" 5/8" 20 70
Table 3 Recommended Bolt Tightening Torques
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. Do not install EPDM liner in compressed air lines.
2 1/2" 1.81
0.69 — — — — 1.50 8/4
5/8-11 UNC
— 0.88 — — — 1.75 8/4
3" 1.81
0.75 — — — — 1.50 8/4
5/8-11 UNC
— 0.94 — — — 1.75 8/4
4" 2.06 0.94 0.94 — — — 1.75 16/8 5/8-11 UNC
VALVE SIZE
1000/2000/3000
SERIES ONLY
TOTAL VALVE
BODY WIDTH
ANSI B16.1
CLASS 125 CAST IRON
FLANGE THICKNESS
ANSI B16.5
CLASS 150 STEEL
FLANGE THICKNESS
ANSI B16.47 (SERIES A)
CLASS 150 STEEL
MSS SP-44
FLANGE THICKNESS
ANSI B16.47 (SERIES B)
CLASS 150 STEEL
WELD NECK
FLANGE THICKNESS
ANSI B16.47 (SERIES B)
CLASS 150 STEEL
BLIND STYLE
FLANGE THICKNESS
RECOMMENDED
CAP SCREW LENGTH
(LUGGED VALVES)
(C)
TOTAL QUANTITY
CAP SCREWS/BOLTS
(TO MOUNT 2 FLANGES)
CAP SCREW SIZE
Table 4 Recommended Bolt Lengths
Resilient Liner Materials
EPDM – EPDM is a terpolymer elastomer made from ethylene-propylene diene monomer. EPDM has good abrasion and tear
resistance and offers excellent chemical resistance to a variety of acids and alkalines. It is susceptible to attack by oils and is not
recommended for applications involving petroleum oils, strong acids or strong alkalines. EPDM should not be used on compressed
air lines. It has exceptionally good weather aging and ozone resistance. It is fairly good in ketones and alcohols.
Proprietary compound formulas are used for
each of the elastomers to provide the right
combination of seat compression, abrasion
resistance and chemical resistance to match
your application. Elastomeric seat materials
are not suitable for steam service.
Revised 8/7/2012