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Butterfly Valves BF Series

• Available in sizes DN 50 to DN 2600 • Short face-to-face length

• Actuation possible by standard handle, • According to DIN 3230, BS 5155,
gear operator, electric operator or API 609, ISO 5752-20 and ISO 5211
pneumatic operator
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BUTTERFLY VALVES BF SERIES

EUROPEAN DIVISIONS OF WATTS WATER TECHNOLOGIES INC.

Watts Industries Europe B.V.

Kollergang 14, 6961 LZ Eerbeek
P.O. Box 152, 6960 AD Eerbeek
The Netherlands
Phone +31 313 673 720
Fax +31 313 654 192
E-mail info@wattsindustries.com
Site www.wattsindustries.com

Watts Ocean B.V.

Kollergang 14, 6961 LZ Eerbeek
P.O. Box 98, 6960 AB Eerbeek
The Netherlands
Phone +31 313 673 700
Fax +31 313 652 073
E-mail info@wattsocean.nl
Site www.wattsindustries.com
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BUTTERFLY VALVES BF SERIES

CONTENT

INTRODUCTION 4

RESILIENT SEAT BUTTERFLY VALVES 5

HYDRAULIC SPECIFICATIONS 9

POSITIONING / LOCKING KIT 10

METHOD OF OPERATION 10
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BUTTERFLY VALVES BF SERIES

INTRODUCTION

4 The Watts BF Series Resilient Seated Butterfly Valve is available in sizes 50 –

2600 mm, Wafer or Lug body design. This series was designed to meet the
stringent requirements of industrial Applications, Water treatment, distribution
systems, fire protection, heating and plumbing systems, OEM, and wherever
positive shut-off is required for liquids, gases, and lurries.

Incorporating a 16 bar pressure rating for 50 - 300 mm and a 10 bar pressure

rating 350 - 600 mm.
- The Series BF is constructed of a ductile cast iron body
- Electrolytic Nickel Plated ductile iron disc
- 416 Stainless Steel shaft
- Optional materials are available to meet specific application requirements.
- A phenolic backed seat prevents the seat from collapsing or dislodging and is
field replaceable
- Available standard seat materials include BUNA-N, EPDM and special factory
orders for Viton

The Watts Series BF Butterfly Valves are designed and manufactured according
to DIN 3230, BS 5155, and API 609.

Body Bushings
Ductile iron 3 low friction bushings totally isolate the shaft
Full rating as dead end service from the body journal
Benefits: High strength ductile iron lugs Benefits: Positive shaft alignment
Prevents shaft seizure in the
Seat body journal
Phenolic backed elastomers Eliminates side loading on actuators
Full vacuum service capabilities Reduced bushing torques
Vacuum taps not required Primary & secondary shaft seals
(upper and lower) Shaft
Benefits: Seats cannot be trapped on installation Trough Shaft Design
Non-collasible Benefits: Blow out proof shaft, reduces
Maximum control for disc/seat disc deflection
interference Maximum shear & torsional
Reduced seat deformation strength capabilities
Flange gaskets are not required
Superior shaft support at Interchangeability
elastomer/disc interface Face to face in accordance with DIN 3202
Discs are machined to match the seat part 3 - K1, ISO 5752-20, and API 609
face to provide maximum sealing Full lug pattern
surfaces with reduced torque & wear Benefits: Interchangeability with Butterfly
Eliminates shaft journal exposure to Valves in conformance to industry
media standards
Maximum sealing capability on
Disc various flanges
Machined & polished disc edge Ease of installation
Precision disc flats
Benefits: Wide seating surface ensures positive Actuation
bubble tight seal Standard handle
Uniform contact around entire Gear operator
circumference minimizing wear, Electric operator
reducing torque & increasing cycle life Pneumatic operator
Benefits: All service requirements met
ISO mounting pad for actuation
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BUTTERFLY VALVES BF SERIES

RESILIENT SEAT BUTTERFLY VALVES

Body Mounting pad ISO 5

Available in Full Lug and 5211, part 1
Wafer style. Face-to-face Designed for easy
dimensions comply with DIN adaptation to pneumatic or
3202, part 3, K1 electric actuators, gear
(corresponds to ISO 5752- operators, and handles.
20) and API 609.

Nameplate
Nameplate is permanently
attached to body providing
disc, seat, and shaft material
specifications for quick
reference.
Pinned disc PTFE Bushings
Disc is attached to shaft by The PTFE non-corrosive,
pins which minimizes flow non-metallic bushing are
turbulence, resulting in strategically located,
higher Kv ratings. providing maximum shaft
support, centralized
alignment for a thru-shaft
journal corrosion and
Disc minimize bushing and
Disc edge is machined and frictional torque.
polished to assure leak-proof
positive shut-off while Shaft Seal
minimizing operating torque. The bi-directional shaft seal
prevents external
contamination of stem area
while providing back-up
for the primary shaft
seal formed by the
disc/seat interface.

Phenolic Backed
Seat
Provides additional support One-Piece Shaft
making it non-collapsible. The high strength centralized
Secured between body and blow-out proof Thru-Shaft
flange making seat design prevents disc
replacement simple deflection and provides
and fast. maximum torsional
No flange gaskets are capabilities while maintaining
needed. 360 ° sealing a thin disc profile thus maxi-
protects components from mizing effective flow area.
media and provides primary
shaft seal. Available in
EPDM, Viton, and Buna-N.
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BUTTERFLY VALVES BF SERIES

DN 50-250 DN 300-600 Materials

1. Body Ductile iron SG 400-12
2. Disc Ductile iron nickel plated
6 6 8 316 stainless steel
Aluminium bronze
5 3. Shaft 416 stainless steel, 316 stainless steel
4. Seat EPDM, NBR, Viton
5. Bushing PTFE (DN 50-300), bronze
(DN 350-600)
6. O-Rings NBR
7. Pin 316 stainless steel
7 8. Key Steel

Seat utilization guide

Buna-N (NBR)
Characteristics Excellent mechanical properties (abrasion), good seal with mineral oil, certain
hydrocarbons, aliphatic solvents
Field of application Hydrocarbon with less than 40% of aromatics, air, natural gas, H2O, sea water, glycol,
brine, alcohol
Temperature limits From -20 °C to +90 °C
To avoid with Solvents, Benzene, Xylol

EPDM
Characteristics Good seal with low temperatures, ozone, atmospheric agents, animal and vegetal fat,
alcohol, bases and diluted acids, acetonic solvents
Field of application Water, sea water, industrial water, steam, brine, abrasive substances, phosphates,
inorganic acids, caustic soda
Temperature limits From -40 °C to +90 °C
To avoid with Oils – Fats, Dry air, Hydrocarbons

Viton (FKM)
Characteristics Good resistance to heat, light, atmospheric agents, hydraulic fluids, fuel, hydrocarbons,
gasproof
Field of application Solvents (acetonics excepted), acids, solid hydrocarbons, bases
Temperature limits From -20 °C to +90 °C
To avoid with Steam, Ketone, Alkali, Amino

Full-lug butterfly valve

Article number Body Disc Shaft Seat
930.xxx.111 Di-SG400-12 Di-Ni plated SS 416 NBR
930.xxx.211 Di-SG400-12 Di-Ni plated SS 416 EPDM
930.xxx.311 Di-SG400-12 SS 316 SS 316 NBR
930.xxx.411 Di-SG400-12 SS 316 SS 316 EPDM
930.xxx.511 Di-SG400-12 Alu-Bronze SS 416 EPDM
930.xxx.611 Di-SG400-12 SS 316 SS 316 VITON

Replace xxx by a number to give the diameter of the butterfly valve (e.g. DN80 = xxx.080.xxx). Other diameters
(up to 2600) on request.
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BUTTERFLY VALVES BF SERIES

Wafer butterfly valve

Article number Body Disc Shaft Seat
920.xxx.111 Di-SG400-12 Di-Ni plated SS 416 NBR 7
920.xxx.211 Di-SG400-12 Di-Ni plated SS 416 EPDM
920.xxx.311 Di-SG400-12 SS 316 SS 316 NBR
920.xxx.411 Di-SG400-12 SS 316 SS 316 EPDM
920.xxx.511 Di-SG400-12 Alu-Bronze SS 416 EPDM
920.xxx.611 Di-SG400-12 Alu-Bronze SS 416 NBR
920.xxx.711 Di-SG400-12 SS 316 SS 316 VITON

Replace xxx by a number to give the diameter of the butterfly valve (e.g. DN80 = xxx.080.xxx). Other diameters
(up to 2600) on request.

Dimensions
Wafer type Lug type Cross section
D4
D6
D5
E

E
B

B
A

2
D

No holes
Aantal gaten
Ø hole
D7 Ø boutgat C

Mounting pad Standard Handle - Dimensions

L1 L
M

Valve size L M R Weight (kg)

DN 300 - 600 DN 50 - 250 50 – 100 mm 267 51 32 0.5
125 – 150 mm 345 51 32 0.8
200 – 300 mm 353 76 45 1.3
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BUTTERFLY VALVES BF SERIES

Operating torque (Nm)

DN Wet Dry Wet Dry
8 10 bar 16 bar
50 13 21 16 26
65 15 28 19 35
80 21 40 24 46
100 36 66 42 77
125 56 97 65 115
150 91 160 109 183
200 167 287 206 355
250 276 470 350 595
300 415 676 534 871
350 532 798
400 730 1096
450 979 1468
500 1306 1959
600 2041 3062

Dimensions (Full-lug / Wafer butterfly valve)

DN (mm) 50 65 80 100 125 150 200
A (mm) 273 296 308 346 372 397 480
B (mm) 161 175 181 200 213 226 260
C (mm) 43 46 46 52 56 56 60
H (mm) 8,86 8,86 8,86 11,1 12,7 12,7 15,88
E (mm) 32 32 32 32 32 32 45
KxL1 (mm) -- -- -- -- -- -- --
D2* (mm) 125 145 160 180 210 240 295
No holes* (--) 4 4 8 8 8 8 12
Ø hole* (mm) M16 M16 M16 M16 M16 M20 M20
D4 (mm) 50 50 50 70 70 70 102
D5 (mm) 7 7 7 10 10 10 12
D6 (mm) 77 77 77 92 92 92 125
D7 (mm) 100 120 127 156 190 212 268
D8 (mm) 12,6 12,6 12,6 15,77 18,92 18,92 22,1
Weight (full-lug) (Kg) 3,7 4,1 4,7 9,0 10,9 14,2 18,2
Weight (wafer) (Kg) 2,5 3,2 3,6 4,9 7,0 7,8 13,2

DN (mm) 250 300 350 400 450 500 600

A (mm) 540 624 680 760 801 905 1091
B (mm) 292 337 368 400 422 480 562
C (mm) 68 78 78 102 114 127 154
H (mm) 20,62 -- -- -- -- -- --
E (mm) 45 45 45 51,2 51,2 64,2 70,2
KxL1 (mm) -- 6,35x32 6,35x32 7,9x40 9,5x46 9,5x46 12,7x60
D2* (mm) 355 410 460 515 565 620 725
No holes* (--) 12 12 16 16 20 20 20
Ø hole* (mm) M24 M24 M20 M24 M24 M24 M27
D4 (mm) 102 102 102 140 140 165 165
D5 (mm) 12 12 12 18 18 22 22
D6 (mm) 125 140 140 197 197 197 276
D7 (mm) 325 403 436 488 539 593 693
D8 (mm) 28,45 31,6 31,6 33,15 38 41,15 50,65
Weight (full-lug) (Kg) 26,8 39,5 55,2 88,5 104,3 179,6 276,7
Weight (wafer) (Kg) 19,2 32,5 41,3 53,1 74,8 124,7 199,6

* Full-lug butterfly valves are drilled PN 16 up to DN 300 and PN 10 DN 350 to DN 600. Wafer butterfly valves
are drilled PN 10 / PN 16 - Different drillings on demand.
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BUTTERFLY VALVES BF SERIES

HYDRAULIC SPECIFICATIONS

The diagram shows Kv coefficient values and Kv Flow Coefficient 9

characteristics of each single nominal diameter. 100.000

Kv (m3/h)
The values are for fully open valves.
Kv flow coefficient states the water flow in m3/h
crossing through the valve and creating a drop of
pressure of 1 bar.
10.000

Liquids
Q = flow through valve (m3/h)
γ = specific gravity (water = 1)
1.000
∆P = pressure drop across valve (bar)

Gas
Q = flow through valve (Nm3/h) 100
0 50 100 150 200 250 300 350 400 450 500 550 600
γ = specific gravity (air = 1) Nominal diameter (mm)
∆P = pressure drop across valve (bar)
(less than 1⁄2 inlet pressure)
P1 = outlet pressure (bar)

Steam
Q = flow through valve (kg/h)
∆P = pressure drop across valve (bar)
(less than 1⁄2 inlet pressure)
P1 = outlet pressure (bar)

The diagram shows K pressure drop values ∆H Pressure Drop

according to the opening degree of the disc.
Head loss coefficient Ksi

1.000

100

∆h = pressure drop (mH2O)

Ksi = pressure drop coefficient (-)
v = nominal velocity (m/s) 10

g = gravity acceleration 9,81 (m/s2)

10 20 30 40 50 60 70 80 90

Valve opening (°deg)

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BUTTERFLY VALVES BF SERIES

POSITIONING / LOCKING KIT

10 For converting standard ten-position handle and

deluxe handle to memory stop, infinite position Infinite position stop bolt and nut
stop and a locking device.
Indicator / stop plate

Mounting bolts and nuts

Latch plate

Memory stop bolt and nut

METHOD OF OPERATION

Installation
Assure gasket surfaces are free of defects.
Valves should not be mounted between flanges
having defective mating surfaces and should
never be used to align improperly positioned pipe.
The distance between pipe flanges should be
checked to assure sufficient clearance for valve
installation.

The valve disc should be positioned inside the

body when being placed between flanges,
however, not fully closed.

For wafer valves, the valve must be visually

centred with respect to the flange faces, while lug
valves may be centred with flange bolts.
Standard Handle Gear operator The valve should be operated to assure that
binding or interference is eliminated. Flange
bolting should be tightened gradually. The flange
joint is complete when the body bottoms against
the flange faces evenly without gaps. Bolts
should then be tightened sufficiently to prevent
loosening of the joint.

Electric operator Pneumatic operator

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BUTTERFLY VALVES BF SERIES

Removal of valve Maintenance

Prior to loosening the flange bolts, Watts BF butterfly valves are designed such that
follow items 1-4: periodic maintenance or lubrication is not
1. Drain piping. required throughout the life of the valve. The 11
2. Vent line to relieve pressure and close valve. following practices are suggested:
a. disconnect air or electric lines from actuator Periodically:
b. loosen flange bolts 1. Operate the valve from fully open to fully
3. Secure necessary lifting equipment to valve closed.
assembly. 2. Check all fasteners for evidence of loosening
4. Remove flange bolts and carefully remove and tighten as required.
valve. 3. Inspect valve and surrounding area for
previous or existing leakage at flange faces or
Caution should be taken due to possible shaft connections.
emission of process material from piping. 4. Check piping and/or wiring to actuators and
related equipment for looseness, and correct
as needed.

The photos and descriptions contained in this brochure are solely intended as an indication. Watts Industries reserves the right to make technical and design changes
to its products without prior notice.
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Product range Watts Industries

- System Disconnectors - Temperature Control

- Backflow Protection Devices - Expansion Vessels
- Check Valves - Process Switches
- Safety Units - Fuel Products
- Safety Relief Valves - Gas Products
- Pressure Reducing Valves - Electronic Controls
- Automatic Control Valves - Installation Protection Products
- Butterfly Valves - Radiator Valves
- Shut-Off Valves - System Products
- Measuring Gauges - Manifolds and Fittings

Watts Ocean B.V.

Kollergang 14, 6961 LZ Eerbeek, The Netherlands
Phone +31 313 673 700 - Fax +31 313 652 073
E-mail info@wattsocean.nl - Site www.wattsindustries.com
57-NL-UK-05/01