Butterfly Valves
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Durafil® is a registered trademark of Cargill, Limited.
Teflon® is a registered trademark of the E.I. Dupont de Nemours & Company, Incorporated.
Uniseal® is a registered trademark of Uniseal, Incorporated.
Viton® is a registered trademark of DuPont Dow Elastomers.
Note: Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise
measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction,
specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts
products previously or subsequently sold.
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Table of Contents
Series DBF and BF with ISO 5211 Mounting Pads - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Series DBF and BF Valve Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Series DBF and BF Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Series DBF and BF Specifications and Torque Rattings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Series DBF and BF Methods of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
How to Order Watts Butterfly Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Duralon is a registered trademark of Rexnord Corporation; Viton GF, Teflon and Dacron are registered trademarks of E.I. DuPont DeNemours & Co.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts
Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any
obligation to make such changes and modifications on Watts products previously or subsequently sold.
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Butterfly Valves
DBF and BF Series with ISO 5211 Mounting Pads
Watts DBF and BF Series resilient seated butterfly valves are available in sizes 2" – 24" (50 – 600mm) in wafer or lug
design. All lugged style valves feature dead-end service to the full pressure rating of the valve. Watts butterfly valves
have a pressure rating of 200psi (13.8 bar) for sizes (2" – 12" (50 – 300mm) and 150psi (10.3 bar) pressure rating for 14" –
24" (350 – 600mm).
Watts DBF and BF Series valves also feature ductile iron body construction, a choice of ductile iron, aluminum bronze,
or 316 stainless steel discs and standard seat materials of EPDM, BUNA-N or Viton® Sizes 2" – 12" (50-300mm) are supplied with a phenolic seat backing, while the 14" – 24" (350 – 600mm) are supplied with an aluminum backing designed
to prevent valve seats from collapsing or dislodging.
All Watts butterfly valves meet the stringent requirements of HVAC, Irrigation, OEM Commercial, and Institutional applications and can be used wherever positive shutoff is required for liquids.
Watts DBF and BF butterfly valves are designed and manufactured for use with ANSI Class 125 or 150 flanges and in
compliance with API 6709 and MSS-SP-67.
All Watts Lugged Style Butterfly Valves feature dead-end service to full pressure rating of valves.
Lugged style DBF-03-M3
BF-04-M3 Wafer
DBF series butterfly valves use domestic and foreign components that have been assembled and tested in the U.S.A.
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Valve Features
Shaft Seal
Mounting Pad
Bushings
Bidirectional shaft seal prevents external
contamination of stem area and provides
backup for the primary shaft seal formed
by the disc-to-seat interface.
ISO 5211 bolt pattern for easy adaptation for actuators, gear operators, and
lever handles.
Three composite Duralon bushings in 2"
– 12" valves and three bronze bushings
in 14"-24" valves provide shaft support
and alignment.
The disc-to-seat interface provides the
primary shaft seal, with a secondary seal
provided by a series of O-rings
molded into the seat at the
shaft location.
Body
Watts DBF and BF butterfly valves are
available in Full Lug (03) and Wafer (04)
designs for use between ANSI 125 and
150 flanges. Face-to-face dimensions
comply with API 609 and MSS-SP-67. All
valves are designed to accommodate 2"
(50mm) of insulation. The standard body
material is ASTM A-536 ductile iron.
Nameplate
Calls out disc, seat and shaft material.
Disc
Disc edge is machined and polished
360° to assure leak-tight shutoff while
minimizing operating torque.
Pinned Disc
The disc-to-shaft attachment is accomplished by the use of taper pins. The pins
minimize flow turbulence, thus improving
Cv ratings.
Dead-End Service
Dead-end service feature for
all lug style valves is standard.
This complies with API 609,
Fifth Edition requirements on
seat retention. Valves suitable for dead-end service to
full pressure rating of valves
without down stream flange
required. Seat is mechanically
retained in the valve body with no
interruption of the seating surface.
One Piece Shaft 2" - 24"
Phenolic Backed Seat
Phenolic Backed Seat: The phenolic backing 2"–12" (50-600mm) or aluminum backing
14"–24" (350-600mm) offers additional support to the seat making it non-collapsible
and blowout proof. The seat face eliminates the need for flange gaskets. Full 360°
sealing protects the body components from the media and provides the primary shaft
seal. Seating is available in EPDM, Buna-N, and Viton.
Delivers positive disc-to-seat location with
maximum strength, and minimum shaft
deflection due to upstream pressure. A
416 stainless steel shaft is standard with
aluminum bronze and ductile iron discs. A
316 stainless steel shaft is standard with
316 stainless steel disc.
Lugged style DBF-03-M2
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Butterfly Valves
DBF and BF Series
Dimensions and Weights
2" through 24"
F
G
N
D
(4) "O" Diameter of
holes on the "N" bolt
circle 45° off center.
B(CL)
A
Q
E
P
▼
I
I
E
45°
▼
J
Across flats
H
Dia.
C
C
A B C D E F G H I J
Size
in.
mmin.
mmin.
mmin.
mmin.
mmin.
mmin.
mmin.
mmin.
mmin.mm
2" 103⁄4273
21⁄2"115⁄8295
3" 121⁄8308
4" 135⁄8346
5" 145⁄8372
6" 155⁄8397
8" 187⁄8479
10"211⁄4540
12"245⁄8626
14"263⁄4679
16" 30 762
18"311⁄2800
20"355⁄16897
24"427⁄81088
63⁄8161
67⁄8175
71⁄8181
77⁄8200
83⁄8213
87⁄8226
101⁄4260
111⁄2292
131⁄4337
141⁄2368
153⁄4400
165⁄8422
187⁄8480
221⁄8562
15⁄842
13⁄445
13⁄445
2 52
23⁄1656
23⁄1656
23⁄860
25⁄866
3 76
3 76
33⁄887
41⁄8105
51⁄8130
6 152
Top Plate Drilling
NO
Size
in.
mm
2"
2 50
21⁄2" 250
3"
2 50
4"
23⁄470
5"
23⁄470
6"
23⁄470
8"
4 102
10"
4 102
12"
5 125
14"
5 125
16"
51⁄2140
18"
51⁄2140
20"
61⁄2165
24"
61⁄2165
in.
Tapped Lug Data
Bolt CircleNo. mm
⁄ 7
1⁄47
1⁄47
3⁄810
3⁄810
3⁄810
1⁄213
1⁄213
1⁄213
1⁄213
11⁄1618
11⁄1618
7⁄822
7⁄822
14
11⁄432 21⁄854 31⁄1677 101⁄2267 1⁄213 33⁄495
11⁄432 21⁄264 31⁄1677 101⁄2267 1⁄213 41⁄4108
11⁄432 31⁄879 31⁄1677 101⁄2267 1⁄213 43⁄4120
11⁄432 41⁄8105 35⁄892 101⁄2267 5⁄816 61⁄16154
11⁄432 47⁄8124 35⁄892 101⁄2267 3⁄419 71⁄8181
11⁄432 61⁄8156 35⁄892 101⁄2267 3⁄419 83⁄16208
13⁄445 8202 5125 14356 7⁄822101⁄4260
13⁄445 97⁄8251 5 125 14 356 11⁄829 125⁄8320
13⁄445 117⁄8301 6 150 14 356 11⁄432 143⁄4375
13⁄445 131⁄8333 6 150 – – 11⁄4321515⁄16405
2 50 153⁄8391 67⁄8175 – – 15⁄1633 181⁄2470
2 50 173⁄8442 67⁄8175 – – 11⁄2382011⁄16525
21⁄853 193⁄8493 81⁄4210 – – 15⁄841 221⁄4565
21⁄458 233⁄8594 81⁄4210 – – 2 50 275⁄16693
in.
mm
43⁄4121
51⁄2140
6150
71⁄2191
81⁄2216
91⁄2241
113⁄4298
141⁄4362
17432
183⁄4
476
211⁄4
540
223⁄4578
25635
291⁄2750
Holes
Bolt
P
Key Way
Q
⁄ 9
⁄ 9
3⁄89
7⁄1611
1⁄213
1⁄213
5⁄816
13⁄1621
–
–
–
–
–
–
–
–
–
–
–
–
38
38
Weight (LBS.)†
in. mmLug Wafer
4 5⁄8"-11UNC x 15⁄8" – – 86
4 5⁄8"-11UNC x 13⁄4" – – 107
4 5⁄8"-11UNC x 13⁄4" – – 107
5⁄8"-11UNC x 2"
8
–
–
17
12
8 3⁄4"-10UNC x 23⁄16" – – 2516
8 3⁄4"-10UNC x 23⁄16" – – 2720
3⁄4"-10UNC x 23⁄8"
8
– – 4029
7⁄8"-9UNC x 25⁄8"
12
– – 6348
7⁄8"-9UNC x 3"
1⁄4 x 11⁄4
12
6 x 32
107
78
1⁄4 x 11⁄4
12
1"-8UNC x 3"
6 x 32
156
99
5⁄16 x113⁄16
16
1"-8UNC x 33⁄8"
8 x 46
203
140
3⁄8 x 19⁄16
16 11⁄8"-7UNC x 41⁄8"
10 x 40
269
188
1
1
3
9
20 1 ⁄8"-7UNC x 5 ⁄8"
⁄8 x 1 ⁄16 10 x 40
392
248
1⁄2 x 23⁄8
20
11⁄4"-7UNC x 6"
13 x 60
593
450
†Weights are for valves with ductile iron or aluminum bronze discs. 2" – 12" have levers; 14" – 24" have bare shafts.
Refer to Watts F-CDBF for gear operator weights.
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Refer to Watts price list PL-WR for ordering codes and prices.
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Torque Ratings
*Seating torques for 2” - 12” standard size discs are rated at 200 psi, and 14” - 24” at 150 psi shut off under “normal” conditions; that is, allowing for mild disc corrosion, temperatures that may approach the material limits, minor chemical effects (such
as swelling) on the elastomer, and intermittent operating frequency (valve not cycled every day).
For applications that do not fall within these parameters, please consult factory.
SEATING TORQUE
Buna-N, EPDM (in./lbs.)
Size
NormalConditions
WET/DRY
2"
134/214
21⁄2"190/289
3"
250/387
4"
390/644
5"
600/959
6"
907/1,542
8"
1,697/2,919
10"
2,500/4,857
12"
3,300/7,071
14"
3,500/7,305
16"
5,500/10,027
18"
8,200/13,437
20"
10,000/17,925
24"
18,680/28,020
2"135
21⁄2"220
3"
302
4"
600
5"
1,022
6"
1,579
8"
3,136
10"
5,340
12"
8,250
14"
11,917
16"
16,388
18"
21,705
20"
27,908
24"
43,116
CV RATING
(Full Open)
SizeCV Rating
DBF, BF-M2 Specification
2" - 24" (50-600 mm)
•All valve bodies shall be ductile iron ASTM A536. All lug body valves shall be fully rated for dead end bidirectional service to
100% of full rating. Lug bodies shall be of the full tapped lug pattern design. All bodies shall be suitable for ANSI 125/150
flanges
•All valves 2" - 12" shall be rated to 200 psi, 14" - 24" shall be rated to 150 psi.
•Lay length dimensions shall comply with API 609 and MSS-SP-67.
•Disc material shall be aluminum bronze, ductile iron, or stainless steel. Discs shall incorporate disc flats with polished radius
on the disc edge circumference. Disc and shaft connection shall be precision taper pin design.
•Shaft shall be one piece through shaft design of 416 stainless steel or 316 stainless steel with stainless steel disc. Valve
shafts shall not be exposed to the line media.
•Seats shall be Buna-N, EPDM, or Viton®. Seats shall fully encapsulate the body and incorporate a rigid backing and primary
seal. All seats shall be suitable for weld neck, slip-on and Van Stone type flanges. Seats shall be suitable for full pressure and
vacuum applications.
Refer to Watts price list PL-WR for ordering codes and prices.
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Butterfly Valves
DBF and BF Series Methods of Operation
Handles
Positioning/Locking Kit for converting standard ten-position handle to
deluxe handle with memory stop, infinite
position stop, locking device.
Standard handle
10-position
Indicator/
Stop plate
Mounting bolts
and nuts
Chainwheel
Latch plate
Memory
stop bolt
and nut
Available in 36" or 48"
lengths for 2" – 12" DBF
or BF Series valves.
Handle Kit Information
Valve Size Std. HandlePosition/Locking
2", 21⁄2", 3" (50 - 80mm)
HK-2000-M2
#1 Pos/Lock
4" (100mm)
HK-2000-M2
#2 Pos/Lock
5", 6" (125mm, 150mm)
HK-2000-M2
#3 Pos/Lock
8" (200mm)
HK-2000-M2
#4 Pos/Lock
10" (250mm)
HK-2000-M2
#5 Pos/Lock
12",14" (300-350mm)
HK-2000-M2
#6 Pos/Lock
16", 18", 20" (400-500mm)
24" (600mm)
Chain-Wheels
Chain
#2 BCWK
#2 BCWK
#2 BCWK
#3 BCWK
#3 BCWK
#3 BCWK
#4 BCWK
#5 BCWK
#2 BCWC
#2 BCWC
#2 BCWC
#3 BCWC
#3 BCWC
#3 BCWC
#3 BCWC
#5 BCWC
Chainwheel kits attach to gear actuator handwheel. Refer to Watts’ price list PL-WR for ordering
codes and prices.
Gear Actuators
C
B
Adjustable Stops
(Set Screws)
D
▼
E
▼
Butterfly Valve
▼
F
▼
A
Actuator dimensions are shown in inches.
Gear Dimensions: STD. Weatherproof W/ Handwheel
A B
C DE
F #TurnsUnit
Valve
Model
2" Sq.
CL to CL toOpen - Weight
Size
#Nut
Depth WidthHW HW Dia.Height MT Pad Close (lbs)
2", 21⁄2", 3"
GOM4-1
OPN-BFG
5.04.2 6.56.02.71.57.010.0
4"
GOM4-2
OPN-BFG
5.04.2 6.56.02.71.57.010.0
5", 6" GOM4-3
OPN-BFG
5.04.2 6.56.02.71.57.010.0
8"
GOM4-4 OPN-BFG 7.0
6.2
9.5
12.0
3.0
1.8
7.5
27.5
10"
GOM4-5 OPN-BFG 7.0
6.2
9.5
12.0
3.0
1.8
7.5
27.5
12", 14"GOM4-6OPN-BFG
7.86.4 9.512.03.0 2.012.533.0
16"
GOM4-7 – 11.59.6 15.0
16.04.2 2.520.070.5
18"
GOM4-8 – 11.59.6 15.0
16.04.2 2.520.070.5
20"
GOM4-9 – 11.59.6 15.0
16.04.2 2.520.070.5
24"
GOM4-10 – 12.69.1 15.0
24.04.5 2.020.080.0
To operate Watts’ butterfly valves with 2" square nut, a gear actuator must be used by removing
gear handwheel and installing 2" nut on gear shaft. Valve should be installed such that gear shaft
is vertical for 2" nut operation. Refer to Watts price list PL-WR for ordering codes and prices.
Weatherproof Gear
Actuator/ Construction
Case
Cast Iron
WormSteel
Segment
Ductile Iron
Input Shaft
Steel
HandwheelGray Iron
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How to order Watts Butterfly Valves
10 - DBF - 03 - 121 - 1G - M3
Size:
2" - 12" (50mm - 300mm) DBF
2" - 24" (50mm - 600mm) BF
M3 Series
Origin:
DBF - Domestically Assembled
BF - International
Series:
03; Full Lug
04; Wafer
Body:
1; Ductile Iron
2; Ductile Iron
Disc:
1; Ductile Iron
2; Aluminum Bronze
3; 316 Stainless Steel
Shaft:
1; 4
16 Stainless Steel
316SS on stainless steel disc models
Seat:
1; EPDM†
2; Buna-N
3; Viton GF® 2" -12" only (50mm - 300mm)
Operator:
0; No handle 2" - 24" (50mm - 600mm)
G; Gear Operator 2" - 48" (50mm - 1200mm)
5; Lever handle (10-position only) - 2" - 12" (50mm - 300mm)
P; Positioning/locking kit with handle 2" - 12" (50mm - 300mm)
Materials
Body – Ductile Iron ASTM A-536
Disc –Electroless Nickel Plated Ductile Iron ASTM
A-395; Aluminum Bronze ASTM A-148; 316
Stainless Steel ASTM A-351
Shaft –
416 Stainless Steel,
316 Stainless Steel on 316SS Disc Models
Seat – EPDM to (+5°F to + 248°F, -15°C to +120°C)
Buna N (+14°F to + 176°F, -10°C to +80°C)
Viton (-4°F to + 302°F, -20°C to +150°C)
Bushings – D
uralon 2" – 12"
Bronze 14" – 24"
Stem O-ring –Buna-N
Do not use EPDM when hydrocarbons are present.
†
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Notes
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For Technical and Ordering Assistance, please call us at 978-688-1811.
To locate your nearest Watts representative, please click on our
find a sales rep locator on watts.com.
Represented by:
A Watts Water Technologies Company
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ON • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
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© 2011 Watts
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