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Page 1

MSS SP-67-2002a

Butterfly Valves

Standard Practice
Developed and Approved by the
Manufacturers Standardization Society of the
Valve and Fittings Industry, Inc.
127 Park Street, NE
Vienna, Virginia 22180
Phone: (703) 281-6613 www.mss-hq.com .
Fax: (703) 281-6671
e-mail: [email protected]

Page 2

MSS STANDARD PRACTICE SP-67

This MSS Standard Practice was developed under the consensus of MSS Technical Committee 407 and the MSS
Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent and
concerned volunteers to provide an effective, clear, and non-exclusive specification that will benefit the industry
as a whole. This MSS Standard Practice is intended as a basis for common practice by the manufacturer, the user,
and the general public. The existence of an MSS Standard Practice does not in itself preclude the manufacture,
sale or use of products not conforming to the Standard Practice. Mandatory conformance is established only by
reference in a code, specification, sales contract, or public law, as applicable.

Unless otherwise specifically noted in this MSS SP, any standard referred to herein is identified by the date of
issue that was applicable to the referenced standard(s) at the date of issue of this MSS SP. (See Annex B).

U. S. customary units in this SP are the standard; the metric units are only for reference only.

Any part of this standard may be quoted. Credit lines should read ‘Extracted from MSS SP-67, 2002a,
with permission of the publishe< the Manufacturers Standardization Society. ’ Reproduction prohibited
under copyright convention unless written permission is granted by the Manufacturers Standardization
Society of the Valve and Fittings Industry, Inc.

Originally Approved December 1964

Copyright O, 1983 by
Manufacturers Standardization Society

of the
Valve and Fittings Industry, Inc.

Printed in U. S. A.

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Page 9

MSS STANDARD PRACTICE SP-67

Nomi~l
Valve
Size(a)

Inches

1%
2
2%
3
4
5
6
8
io
12
14
16
i8
20
24
30
36
42
48
54
60
64
66
72

TABLE 1 Pipe Minimum Diameters for Disc Clearance

-~

Inches -

3.26
3.26

6.08
8.1 1
10.00
i 2.02
13.94
i 5.86
17.84
19.84
23.88
29.90
35.90
4 I .90
47.90
53.90
59.90

65.90
71.90 -

-
mm -

82.8
102.6

154.4
206.0
254.0
305 -3
354. I
402.8
453. I
503.9
606.6
759.5
91 1.9
1064.3
1216.7
1369.1
1521.5

1673.9
1826.3 -

Inches

1.61
2.07
2.47
3.07
4.03
5.05
6.07
7 -98
10.2
I 1.94
13.25
15.25
17-25
19.25
23.25
29.25
35.25
4 1.24
47.25

- mm
40.9
52.6
62.7
78.0
102.4
128.3
154.2
202.7
254.5
303.3
336.6
387.4
438.2
439.0
590.6
743.0
895.4
1047.5
1200.2

-

Unlined Ductile Iron Pipe

Minimum
Pressure Class
Inches

3.40
4.24

6.34
8.49
10.52
12.58
14.66
16.72
18.80
20.86
25.06
3 1-26
37.48
43.62
49.82
56.44
60.43
64.45

-

mm

86.4
107.7

161.0
2 15.6
267.2
3 19.5
372.4
424.7
477.5
529.8
636.5
794.0
952.0

i 107.9
1 265.4
1433.6
1534.9
1637.0

-

Inches

3.40
4.24

6.34
8.49

10.52
12.58
14.60
i 6.64
18.70
20.76
24.86
30.96
37.12
43. i8
49.34
55.88
59.85
63.83

-

rnm

86.4
107.7

161.0
2 15.6
267.2
3 19.5
370.8
422.7
475.0
527.3
63 1.4
786.4
942.8
1096.8
1253.2
1419.4
1520.2
1621.3

-

Special
class 53

Inches

3.28
4.10

6.16
8.27
10.28
12.34
14.38
16.46
18.54
20.62
24.78
30.92
37.08
43.14
49.30
55.84

mm

83.3
104.1

156.5
210.1
261.1
313.4
365.3
418.1
470.9
523.7
629.4
785.4
941.8
1095.8
1252.2
1418.3

(a) For valve sizes not covered by pipe data in Table 1, caution must be exercised as required in Section 5 to insure
there is no interference between piping I.D. and valve disc.

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Page 10

MSS STANDARD PRACTICE SP-67

127.0
127.0
127.0
127.0
152.4
203.2
203.2
203.2
203.2
203.2
203.2
203.2
304.8
304.8
304.8
381.0
381.0
381.0
457.2
457.2

(b) Diameters for the valves sizes 3 NPS through 24NPS were calculated from Tables 6.4, and 6.5 of ANSI A21.6
(Withdrawn in 1993) with allowance forthe specified tolerances to get the smallest I.D. as follows:

5.00
7 .OO
7.50
8.00
8.50

15.00
15.00
16.00
16.00
16.00
18.00
18.00
22.00
22.00
24.00
26.00
28.00
30.00
34.00
36.00
7

Size 3 NPS - 6NPS thickness class 22 Si IONPS - 12 NPS thickness class 24 Size I6NPS -24 NPS thickness class 26
8 NPS thickness clas 23 1 4 m thiclaiessclm 25

127.0
177.8
190.5
203.2
215.9
381 .O
381 .O
406.4
406.4
406.4

-

Diameters for valve sizes 30 NPS through 60 NPS are calculated 60m ANSI A21.2 With allowances forthe specified tolerances to get the smallest I.D.
Diameters for valves sizes 66NPS through 72 NPS are extrapolated based on the consistency of size 30NPS and larger.

(c) Diameters are calculated subtracting twice the nominal wall thickness from the outside diameter as specified for standard pipe in Table 2 of ASME
B36.10M.

(d) Pipe dimensional data in Table 1 is for unlined pipe. The majority of Gray Iron A2 1.6 and Ductile Iron Pipe ANSUAWWA CI 5 VA21.5 1 include a
cement mortar lining. For valve installations with lined pipelines, caution must be exercised as required in Section S to insure there is no interference
between the piping and the valve disc.

(e) Ductile iron pipe diameters are calculated by subtracting the ANSUAWWA CI5 UA2 1 .SI negative OD tolerance and twice the nominal wall thickness
from the nominal OD.

(i) The minimum nominal wall thickness of ductile iron pipe flanged in accordance with ANSVAWWA CI I YA2 I . IS, Standard for Flanged Ductile-Iron
Pipe with Threaded Flanges, is Special Class 53 for 3-54 inch nominal pipe sizesand Pressure Class 350 for 60 and 64 inch pipe sizes.

(8) 64 inch ductile iron pipe flanged in accordance with ANSVAWWA CI 1 S/A21. IS have 66 inch NPS flanges. If a 66 inch NF'S butterfly valve is used
with this pipe, careful consideration should be given to disc clearance.

(h) Ductile iron pipe are available in classes other than those listed in Table I . When using other classes, consult the valveípipe manufacturers for clearance

10.06

requirements
TABLE 2 Face-to-Face Dimensions - Flanged End Valves

Nominal
Valve
Size

1%
2
2%
3
4
5
6

8
10
12
14
16
18
20
24
30
36
42
48
54
60
66
72

-

I TOLERANCE Narrow Wide ,-Face Face-i
in. -
-
-

5.00
5.00
5 .OO
5 -00
6.00
8 .O0
8 .OO
8 .O0
8.00
8 .o0
8 .00
8.00

12.00
12.00
12.00
1 5 . 0
15.00
15.00
18.00
18.00 -

457.2
457.2
558.8
558.8
609.6
660.4
71 1.2
762.0
863.6
914.4

f

i
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Provided by IHS under license with MSS

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Page 18

MSS STANDARD PRACTICE SP-67

ANNEX B

Referenced Standards and Applicable Dates

This Annex is an integral part of this standard practice and is placed after the main text for convenience.

Standard Name or Description

ASME, ANSWASME, ANSI. ASMEYANSI

B1.l - 1989 Unified Inch Screw Threads
B16.1 - 1998 Cast Iron Pipe Flanges and Flanged Fittings
B16.5 - 1996 'Pipe Flanges and Flanged Fittings
B16.24

B 16.34
B16.42 - 1998
B 16.47
B36.10M - 1996

- 1991(R98) Cast Copper Alloy Pipe Flanges, Class 150,300,400,600,900, 1500, and 2500,
and Flanged Fittings, Class 150 and 300

- 1996(A98) Valves - Flanged, Threaded and Welding End
Ductile Iron Pipe Flanges and Flanged Fittings, Classes 150 and 300

- 1996(A98) Large Diameter Steel Flanges, NPS 26 Through NPS 60
Welded and Seamless Wrought Steel Pipe

1998 Boiler and Pressure Vessel Code, Sections I and VI11

ANSIJAWWA

C115/A21.15-88
C 15 1/A2 1.5 1-9 1
C207-94

C504-94 Rubber-Seated Butterfly Valves
C606-87 Grooved and Shouldered Joints

Flanged Ductile-Iron Pipe with Threaded Flanges
Ductile-Iron Pipe, Centrifugally Cast, for Water or Other Liquids
Steel Pipe Flanges for Waterworks Service - Sizes 4 in. Through 144 in.
(1 O0 mm through 360 mm)

SP-25- 1998
SP-68- 1997
SP-9 1- 1992(R96)

Standard Marking System for Valves, Fittings, Flanges and Unions
High Pressure Butterfly Valves with Offset Design
Guidelines for Manual Operation of Valves

Publications of the following organizations appear in the above list:

ANSI American National Standards Institute, Inc.
25 West 43rd Street, Fourth Floor, New York, Ny 10036

ASME The American Society of Mechanical Engineers
Three Park Avenue, New York, NY I O0 16-5990

AWWA American Water Works Association
6666 W. Quincy Avenue, Denver, CO 80235-3098

MSS Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park St., N.E., Vienna, VA 22180-4602

15
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Provided by IHS under license with MSS

Not for ResaleNo reproduction or networking permitted without license from IHS

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Page 19

Number
SP-6-2001
SP-9-2001
SP-25-1998
SP-42-1999
SP-43-1991
SP-44-1996
SP-45-2003
SP-51-2003
SP-53-1999

SP-54-1999
SP-55-2001

SP-58-2002
SP-60-2004
SP-61-2003
SP-65-2004
SP-67-2002a
SP-68-1997
SP-69-2003
SP-70-1998
SP-71-1997
SP-72-1999
SP-73-2003
SP-75-1998
SP-77- 1995
SP-78-1998
SP-79-2004
SP-80-2003
SP-81-2001
SP-82-1992
SP-83-2001
SP-85-2002
SP-86-2002
SP-88-1993
SP-89-2003
sP-90-2000
SP-91-1992
SP-92-1999
SP-93-1999

SP-94-1999

SP-95-2000
SP-96-2001
SP-97-2001
SP-98-2001
SP-99-1994
sP-100-2002
SP-101-1989
SP-102-1989
SP-103-1995
SP-104-2003
SP-105-1996
SP-106-2003
SP-I 08-2002
SP-I 09-1 997
SP-110-1996
SP-111-2001
SP-112-1999

SP-ll3-2M)l
SP-114-2001
SP- 1 1 5- 1 999
SP-116-2003
SP-117-2002
SP-118-2002
SP-119-2003
SP-120-2002
SP-121-1997
SP-122-1997
SP-I 23-1 998
SP-124-2001
SP-125-2000
SP-126-2000
SP-127-2001
SP-129-2003

List of MSS Standard Practices
(Price List Available Upon Request)

Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
Spot Facing for Bronze, Iron and Steel Flanges
Standard Marking System For Valves, Fittings, Flanges and Unions
Class 150 Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends
(R 01) Wrought Stainless Steel Butt-welding Fittings
(R 01) Steel Pipeline Flanges
Bypass and Drain Connections
Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
(R 02) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Componets - Magnetic Particle
Examination Method
(R 02) Quality Standard for Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Radiographic Examination Method
Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation of
Surface Irregularities
Pipe Hangers and Supports - Materials, Design, and Manufacture
Connecting Flange Joint Between Tapping Sleeves and Tapping Valves
Pressure Testing of Steel Valves
High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
Butterfly Valves
High Pressure Buttemy Valves with Offset Design
ANSIIMSS Edition - Pipe Hangers and Supports- Selection and Application
Cast Iron Gate Valves, Flanged and Threaded Ends
Gray Iron Swing Check Valves, Flanged and Threaded Ends
Ball Valves with Flanged or Butt Welding Ends for General Service
Brazing Joints for Copper and Copper Alloy Pressure Fittings
Specification for High Test Wrought Butt Welding Fittings
(R 00) Guidelines for Pipe Support Contractual Relationships
Cast Iron Plug Valves, Flanged and Threaded Ends
Socket-Welding Reducer Inserts
Bronze Gate, Globe, Angle, and Check Valves
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
Valve Pressure Testing Methods
Class 3000 Steel Pipe Unions, Socket Welding and Threaded
Gray Iron Globe &Angle Valves, Flanged and Threaded Ends
Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators
(R 01) Diaphragm Valves
Pipe Hangars and Supports - Fabrication and Installation Practices
Guidelines on Terminology for Pipe Hangers and Supports
(R 96) Guidelines for Manual Operations of Valves
MSS Valve User Guide
(R 04) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components-Liquid Penetrant
Examination Method
(R 04) Quality Std for Ferritic and Martensitlc Steel Castings for Valves, Flanges, and Fittings and Other Piping Components-Ultrasonic
Examination Method
Swage(d) Nipples and Bull Plugs
Guidelines on Terminology for Valves and Fittings
Integrally Reinforced Forged Branch Outlet Fittings-Socket Welding, Threaded, and Buttwelding Ends
Protective Coatings for the Interior of Valves, Hydrants, and Fittings
(R 01) Instrument Valves
Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves
(R 01) Part-Turn Valve Actuator Attachment-Flange and Driving Component Dimensions and Performance Characteristics
(R 01) Multi-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics
(R 00) Wrought Copper and Copper Alloy Insert Fittings for Polybutylene Systems
Wrought Copper Solder Joint Pressure Fittings
(R 01) Instrument Valves for Code Applications
Cast Copper Alloy Flanges and Flanged Fittings, Class 125, 150 and 300
Resilient-Seated Cast-Iron Eccentric Plug Valves
Welded Fabricated Copper Solder Joint Pressure Fittings
Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends
Gray-Iron and Ductile-Iron Tapping Sleeves
(R 04) Quality Standard for Evaluation of Cast Surface Finishes - Visual and Tactile Method. This SP must be sold with a IO-surface, three
dimensional Cast Surface Comparator, which is a necessary pari of the Standard.
Additional Comparators may be sold separately at $70.00 each. Same quantity discounts apply on total order.
Connecting Joint between Tapping Machines and Tapping Valves
Corrosion Resistant Pipe Fittings Threaded and Socket Welding, Class 150 and 1000
Excess Flow Valves 1 1/4 NPS and Smaller, for Fuel Gas Service
Service-Line Valves and Fittings for Drinking Water Systems
Bellows Seals for Globe and Gate Valves
Compact Steel Globe & Check Valves - Flanged, Flangeless, Threaded, & Welding Ends (Chemical & Petroleum Refinery Service)
Factory-Made Wrought Belled End Socket-Welding Fittings
Flexible Graphite Packing System for Rising Stem Steel Valves (Design Requirements)
(R 02) Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves
Plastic Industrial Ball Valves
Non-Ferrous Threaded and Solder-Joint Unions for Use With Copper Water Tube
Fabricated Tapping Sleeves
Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
Steel In-Line Spring-Assisted Center Guided Check Valves
Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
Copper-Nickel Socket-Welding Fittings and Unions
Bellows Seals for Instrument Valves SP-130-2003

(R YEAR) Indicates year standard reaffirmed without substantive changes

A large number of former MSS Practices have been approved by the ANSI or ANSI Standards, published by others. in order to maintain a single source
of authoritative information, the MSS withdraws its Standard Practice in such cases.

Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park Street, N.E., Vienna, VA22180-4620 (703) 281-6613 fax # (703) 281-6671

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