Concentric type of butterfly valve is widely used for various applications. From Wafer to Lug, Flange, Universal, U section or AWWA types are all upon on request.

1. 25F, No.758, Zhongming S. Rd., South Dist.,
Taichung City 402, Taiwan (R.O.C.)
Tel: +886-4-22655306
Fax: +886-4-22650723
Email: info@terofox.com
Website: www.terofox.com
CT201605 BALL-VALVES 500
Resilient
Seated
Butterfly Valves
Terofox Valves
Integrated Corporation

2. PRODUCT
SCOPE
API 607 Fire Safe Ball Valve
API 608 Metal Ball Valve
BS 6364 Cryogenic Ball Valve
ISO 15848 Fugitive Emission
High Pressure Ball Valve
V-port Control Ball Valve
Automation Control Ball Valve
Multi-way Ball Valve
Sanitary Ball Valve
API 6D Trunnion Mounted Ball Valve
API 594 Dual Plate Check Valve
API 600 Gate, Globe & Check Valve
API 602 Gate, Globe & Check Valve
API 603 Gate, Globe & Check Valve
API 609 Resilient Seated Butterfly Valve
High Performance Butterfly Valve
INDEX
Company Profile
Product Quality Assurance
Terofox Model Selection
Features & Standards
Applications
Specification
Comparison Table for Valves
Products
BFV-700 series
Wafer Type Concentric Resilient Seated Series
Butterfly Valve
Installation Precaution
Bolt Installation Data
Maintenance
Troubleshooting
Installation & Maintenance
01 02
BFV-701 series
Lug Type Concentric Resilient Seated Series
Butterfly Valve
BFV-702V series
Double Flange Type Concentric Resilient Seated
Series Butterfly Valve
BFV-703 series
U-section Type Concentric Resilient Seated Series
Butterfly Valve
T series
2-PC PTFE Lining Concentric Series Butterfly Valve
D series
Dovetail Type (Soft Back Seat) Concentric Resilient
Seated Series Butterfly Valve
03
04
05
06
06
07
09
10
27
www.terofox.com
Torque Table
CV value & Curve
Medium & Material Applicable
Technical Reference 24
Business With Integrity,
Uncompromising
Quality & Service

3. Terofox Concentric Butterfly Valve
e are a Taiwanese Valves Manufacturer based in Taichung City, Taiwan. Our dedicated team of Engineers
and Quality Assurance personnel is working on our behalf at all points of manufacturing. Therefore we
are able to work closely, making sure that all our customers’ needs and concerns are consistently and professionally
monitored on ongoing basis. There are two production lines both between Taichung, Taiwan and Zhongshan,
China. We also own a production factory with a foundry (certificated by EU PED Equipment Pressure of TÜV
Germany & ISO 9001:2000 of DNV GL Assurance. )
Terofox adopts philosophy of “supplying quality first”. ISO-9001 certified production units, high-quality materials,
internally recognized designs, precise execution, and dedicated services all come together to customer satisfaction
towards Terofox. The foundation stone of strict quality control is “Terofox Quality Assurance Program” in which
encloses standardized quality control procedures and guides, in accordance with ISO 9001 and other Directives.
Advancing pattern designs is the addition to the absolute quality maintenance. Terofox team is determined to
propose best possible solutions at an efficient cost. Persisting long-term business relationships, Terofox seeks what
is best for customers.
In order to satisfy variety of requirements, we have applied
for certificates such as ISO 9001, CE ( PED 97/23/EC ),
API607 6th Edition Fire Safe Approved for floating and
trunnion mounted ball valve, ABS PDA certificate, TA-Luft,
ISO15848 for Fugitive Emission applications, AD-2000, as
well as foundry approvals: DNV, BV, LR certifications.
Our mission is to assist our customers in obtaining the
best possible solutions to their requirements and
needs, at the most advantageous prices, without
compromising on delivery or quality. With this in mind,
we believe in developing long terms relationships,
based on mutual trust and honesty.
• API608 Floating Stainless Steel Ball valve
• API6D Trunnion Ball valves.
• API 594 Dual plate check valves.
• Concentric Butterfly Valves (Pins and Pinless / PTFE lining )
But our main focus is our “Special Product Line” in Taiwan that includes:
• Sanitary Valves.
• BS6364 Cryogenic Valves: Used in the transmission of extreme low temperature services.
• Special Alloy Valves: Some of the Materials we offer are Alloy 20, Monel, Hastelloy, Duplex/ Super Duplex Stainles Steel,
Titanium and more.
• Dead-man Return Ball Valves: Spring Return Handle that decreases the Torque for easier use.
• Fugitive Emission ISO15848-1 certified : Safety is a trend nowadays, our low emission valve meets ISO15848-1 for
eliminating fugitive emission
• API607 6th Edition / ISO10497:2010 Fire Safe Approval ball valves - Flange Ball valves ( TF-20FS, TF-20DFS ), Trunnion
Mounted Ball Valve ( TF-40FS, TF-44FS ) and high performance Ball Valve (EB-321DFS), Wafer Type Ball Valve ( TF-10MFS)
Terofox Highlights at a Glance:
ISO 9001 certified manufacturing facilities
Designs adherence to internationally recognized standards
- API 609
- ASME B16.34
- EN593 (BS5163)
- MSS-SP-67
- EN1092
100 % Q.C
- All valves undergo pressure testing to 110% of rated
pressure to assure bubble-tight shut off.
Material Traceability
- Every order will be delivered with a EN10204 3.1 mill
certificate without charge.
- Positive Material Identification verifies material traceability
certificates.
www.terofox.com03 04
Product Quality Assurance
Company Profile
W
Terofox provides one stop service in diversity of valves’ procurement
and ODM & OEM manufacturing, all our products and quality
management procedures are in accordance with ISO 9001. Our
wide range of products includes:

4. Small in size and light in weight. Easy installation and maintenance. Simple and compact construction,
quick 90 degrees on-off operation.
Minimized operating torque, energy-saving.
Bubble-tight shut-off for bidirectional service to 15 Bar on sizes 2”-12” (50mm-300mm) and to 10 Bar
on sizes 14”-24” (350mm-600mm). Wide selection of materials, applicable for various medium.
Long service life: standing the test of tens of thousands opening/closing operations.
Flow curve tending to straight line. Excellent regulation performance
www.terofox.com05 06
Features & StandardsTerofox Model Selection
Applications
*1 Standard seat design of PTFE lining type is not phenolic back seat, please see page 20 for
further information.
BFV-7 + +
DISC
Pin design disc
Pinless design disc
Slim-disc
PTFE lining disc
PTFE lining Slim-disc
BODY
1-pc design body
2-pc design body
Phenolic back seat *1
Dovetail seat
Vulcanized seat
OPERATION
Double acting pneumatic actuator
Spring return pneumatic actuator
Electric actuator
Wafer type
Lug type
Double flange type
U-Section type
U-Section ( taper threaded ) type
Universal type
DA
SR
EL
D
V
T
0
1
2
3
4
0
1
2
3
3L
4
Terofox products are used in a wide range of industries including:
Air Separation Equipment
Chemical
Evacuation Device
HVAC
Mining
Oil Refining Industry
Pharmaceutical
Pulp & Paper
Seawater
Sugar/Ethanol
Ultrapure Water
Beverage
Desalination
Food Processing
Irrigation
Marine
Power Plant
Petroleum Refining & Oilfield
Power/ Fgd
Steel Production
Textile
Water & Wastewater Treatment
Equipment
SEAT
END CONNECTION
BFV-700 series
BFV-701 series
BFV-702V series
BFV-703 series
T series
D series
Wafer Type Concentric Resilient Seated Butterfly Valve Series
Lug Type Concentric Resilient Seated Butterfly Valve Series
Double Flange Type Concentric Resilient Seated Butterfly Valve Series
U-Section Type Concentric Resilient Seated Butterfly Valve Series
PTFE Lining Concentric Butterfly Valve Series
Dovetail Type (Soft Back Seat) Concentric Resilient Seated Butterfly Valve Series
According to sleeve type (refer to page 26) for reference.
Fig No.
Working
Temperature
End
Connection
Rating
ANSI Class 125 / 150
DIN PN 10 / 16
JIS 10K
Valve Design
Top Flange
Face to Face
API 609, ASME B16.34, EN 593, MSS SP-67
ISO 5211
API 609, ISO 5752, EN 558, ASME B16.10.
Pressure
Testing
Shell testing
LPC testing (low pressure closure testing)
2” ~ 20” (DN 50 ~ DN 600) 15 / 24 Bar
22” ~ 40” (DN 550 ~ DN 1000) 15 Bar
2” ~ 40” (DN 50 ~ DN 1000) 6 Bar

5. www.terofox.com07 08
Specification
Specification
Square Stem (STD): suitable to actuator
assembling for sizes 2”~24”.
Double Key stem: Be applicable for sizes
over 24”.
Top mounting complies with ISO 5211, suitable
toactuator assembling. Nameplate (with material
info) on the side of mounting pad.
Square stem Double Keyed stem
Top Mounting
Disc
Stem
Pin Design Disc: Common design for concentric butterfly valve.
Disc-to-stem connection depends on pins. (STD)
Pinless Design Disc: Complete isolation between stem and media,
providing longer service time.
Slim Disc: Providing a much higher CV and greater pressure
recovery, and also complete isolation between stem and medium.
Lining Disc: PTFE lining provides corrosion resistance
Pin design disc
Pinless design disc
Slim-disc
Lining disc
Seat
Operation
Dovetail seat
Phenolic Back Seat (STD): Elastomer is supported by hard
phenolic backing and can be replaceable easily
Dovetail Seat / Soft Back Seat: Complete isolation of flowing
medium from the body. Installation must be between two
flanges to make seat subject to distortion.
Vulcanized Seat: Vulcanization to the entire body interior
prevents distortion (creep) during valve operation.
Irreplaceable.
Cast iron lever with 9 positions
notch plate, aluminum and
stainless steel lever is available
for option.
Manual gear operator featuring
reducing open/close torque.
The main function is to saving
strength, secondary worm
gear is available.
Pneumatic Actuator
Electronic Actuator
Override Gear Box
Limit Switch Box
Solenoid
Positioner
Actuators & Accessories
Vulcanized seat
Phenolic back seat

7. SEAT:
Terofox standard phenolic
back seat can be replaceable
easily, and dovetail seat and
vulcanized seat for option.
DISC:
Three types for options,
providing additional coating
or lining for different specific
application.
PIN:
Fixing disc and stem, and
pinless available upon
request.
WAFER / LUG BODY:
Cast iron, ductile iron and carbon
steel body with epoxy powder
coating. 1-pc design body to be
fabricated easily ; 2-pc design
specifically for PTFE lining type
NECK:
Extended neck design in all valve
sizes allows 2” of piping insulation
and provides easy access for
mounting actuators
STEM:
Stem size and structure are in
compliance with ISO 5211 (excluding
double D stem). 1-pc design stem and
2-pc design stem to suit different disc
type.
O-RING:
Designed to be seated in a groove and
compressed during assembly between
stem and body, creating a seal at the
interface.
Figure 01. BFV-700 / BFV-701 Explode View
STEM BUSHING:
The bushing assures correct interaction
between the upper stem and the lower
stem while ensures the smooth running
of the stem.
1./
6./
7./
8./
2./
3./
4./
5./
2
6
7
7
1
1
8
4
5
3
www.terofox.com11 12
BFV-700
Wafer Type Concentric Resilient
Seated Butterfly Valve
SIZE
DIMENSIONS AND WEIGHT
DN50 2"
DN65 2-1/2"
DN80 3"
DN100 4"
A B L H1
ØJ NxØP R°
140
150
158
176
80
89
114
ØD
78.8
104
52.6
64.3
95
120.7
139.7
152.4
190.5 45
DN125 5"
DN150 6"
190 127 215.9
212
123.3
155.7139 241.3
235
265
305
203
175
242
202.4
250.4
301.5
45
32
45
32
45
32
32
32
32
298.5
362.0
431.8
4xØ20
4xØ23
4xØ26
4xØ20
4xØ20
4xØ20
30
45
90
30
45
90
45
90
8"
10"
12"
DN200
DN250
DN300
unit:mm
295
350
400
30
30
45
43
46
46
52
56
56
60
68
78
ØJ NxØP R°
125
145
160
180 45
210
240
295
355
410
4xØ18
4xØ18
4xØ26
*4xØ18
4xØ18
4xØ18
4xØ22
4xØ22
4xØ26
30
45
90
30
45
90
30
45
4xØ26
4xØ23
4xØ23
4xØ23
4xØ23
4xØ23
NxØP R°ØJ
125
145
160
180
210
240
4xØ18
4xØ18
*4xØ18
4xØ18
4xØ18
4xØ22
45
45
90
45
90
45
Weight
(kg)
CL150 PN10 PN16
14
3.2
21
3.6
32
3.8
5.3
6.6
8.2
R°
ØD
L
B
A
H1
ØJ
NxØP
Figure 02. BFV-700 Cross-sectional

8. www.terofox.com13 14
CONNECTION DIMENSIONS
Outer Diameter of flange (ØG) Diameter of center Circle (ØJ) Number and Diameter of
bolt Holes (NxØP)
2” ~ 2-1/2”
(DN 50 ~ DN 65) 3” (DN 80)
4” ~ 14”
(DN 100 ~ DN350)
16” ~24”
(DN 400 ~ DN600)
28” ~40”
(DN 700 ~ DN 1000)
Wafer Type Shape
against Size
50
65
80
100
125
150
200
250
300
350
400
450
500
600
DN 150LB PN 10 PN 16 JIS 10K 150LB PN 10 PN 16 JIS 10K 150LB PN 10 PN 16 JIS 10K
150
180
190
230
255
280
345
405
485
535
595
635
700
815
165
185
200
220
250
285
340
405
460
520
580
640
715
840
165
185
200
220
250
285
340
405
460
520
580
640
715
840
155
175
185
210
250
280
330
400
445
490
560
620
675
745
120.7
139.7
152.4
190.5
215.9
241.3
298.5
362
431.8
476.3
539.8
577.9
635
749.3
125
145
160
180
210
240
295
350
400
460
515
565
620
725
125
145
160
180
210
240
295
355
410
470
525
585
650
770
120
140
150
175
210
240
290
355
400
445
510
565
620
730
4-19
4-19
4-19
8-19
8-22
8-22
8-22
12-26
12-26
12-29
16-29
16-32
20-32
20-35
4-18
4-18
8-18
8-18
8-18
8-23
8-23
12-23
12-23
16-23
16-26
20-26
20-26
20-30
4-18
4-18
8-18
8-18
8-18
8-23
12-23
12-26
12-26
16-26
16-30
20-30
20-33
20-36
4-19
4-19
8-19
8-19
8-23
8-23
12-23
12-25
16-25
16-25
16-27
20-27
20-27
24-33
≧16"
R°
L
ØD
B
A
ØJ
NxØP
SIZE
DIMENSIONS AND WEIGHT
A B L
ØJ NxØP R°
ØD
unit:mm
ØJ NxØP R°NxØP R°ØJ
Weight
(kg)
CL150 PN10 PN16
8"
10"
12"
14"
DN200
DN250
DN300
DN350
DN400 16"
DN450 18"
DN500 20"
6"DN150
DN600 24"
235
265
305
363
400
422
480
212
562
203
175
242
267
309
328
361
139
459
202.4
333.5
250.4
301.5
389.6
440.5
491.6
155.7
592.5
298.5
362.0
431.8
476.3
539.8
577.9
635.0
241.3
749.3
4xØ26
4xØ23
4xØ26
4xØ29
4xØ29
4xØ32
4xØ32
4xØ23
4xØ35
30
30
30
45
22.5
18
22.5
45
18
60
68
78
78
102
114
127
56
154
22.5
18
18
18
30
30
45
22.5
30
525
585
650
770
240
295
355
410
470
4xØ30
4xØ30
4xØ33
4xØ36
4xØ26
4xØ22
4xØ22
4xØ26
4xØ26
114
11.1
163
21
215
28
42
50
96
18
18
18
22.5
30
30
22.5
45
45
515
565
620
725
295
350
400
460
240
4xØ26
4xØ26
4xØ26
4xØ30
4xØ23
4xØ23
4xØ23
4xØ23
4xØ22

9. www.terofox.com15 16
≧16"
R°
L
ØDA
B
ØJ NxM
SIZE
DIMENSIONS AND WEIGHT
A B L
ØJ NxØP R°
ØD
unit:mm
ØJ NxØP R°NxØP R°ØJ
Weight
(kg)
CL150 PN10 PN16
8"
10"
12"
14"
DN200
DN250
DN300
DN350
DN400 16"
DN450 18"
DN500 20"
6"DN150
DN600 24"
235
265
305
363
400
422
480
212
562
203
175
242
267
309
328
361
139
459
202.4
333.5
250.4
301.5
389.6
440.5
491.6
155.7
592.5
298.5
362.0
431.8
476.3
539.8
577.9
635.0
241.3
749.3
30
30
30
45
22.5
18
22.5
45
18
60
68
78
78
102
114
127
56
154
22.5
18
18
18
30
30
45
22.5
30
525
585
650
770
240
295
355
410
470
18
18
18
22.5
30
30
22.5
45
45
515
565
620
725
295
350
400
460
240
135
15.2
221
26
285
34
52
60
106
16x1-1/8"-7
UNC-2B
20x1-1/8"-7
UNC-2B
20x1-1/4"-7
UNC-2B
8x3/4"-10
UNC-2B
8x3/4"-10
UNC-2B
12x7/8"-9
UNC-2B
12x7/8"-9
UNC-2B
16x1" -8
UNC-2B
12x1"-8
UNC-2B
16xM27
20xM27
20xM30
20xM33
8xM20
12xM20
12xM24
12xM24
16xM24
16xM24
20xM24
20xM24
20xM27
8xM20
12xM20
12xM20
16xM20
8xM20
19
4.2
27
4.7
42
5.2
9
10.9
12.3
°R
ØD
L
H1
B
A
ØJ
NxM
BFV-701
Lug type concentric resilient seated
butterfly valve
SIZE
DIMENSIONS AND WEIGHT
DN50 2"
DN65 2-1/2"
DN80 3"
DN100 4"
A B L H1
ØJ NxM R°
140
150
158
176
80
89
114
ØD
78.8
104
52.6
64.3
95
120.7
139.7
152.4
190.5 45
DN125 5"
DN150 6"
190 127 215.9
212
123.3
155.7139 241.3
235
265
305
203
175
242
202.4
250.4
301.5
45
32
45
32
45
32
32
32
32
298.5
362.0
431.8
30
45
90
30
45
90
45
90
8"
10"
12"
DN200
DN250
DN300
unit:mm
295
350
400
30
30
45
43
46
46
52
56
56
60
68
78
ØJ NxM R°
125
145
160
180 45
210
240
295
355
410
30
45
90
30
45
90
30
45
NxM R°ØJ
125
145
160
180
210
240
45
45
90
45
90
45
Weight
(kg)
CL150 PN10 PN16
4x5/8"-11
UNC-2B
4X5/8"-11
UNC-2B
4X5/8"-11
UNC-2B
8X5/8"-11
UNC-2B
8x3/4"-10
UNC-2B
8x3/4"-10
UNC-2B
12x7/8"-9
UNC-2B
12x7/8"-9
UNC-2B
8x3/4"-10
UNC-2B
8xM20
12xM20
12xM20
4xM16
*4xM16
8xM16
8xM16
8xM20
8xM16
4xM16
*4xM16
8xM16
8xM16
8xM20
12xM20
12xM24
12xM24
8xM16
Figure 03. BFV-701 Cross-sectional

10. www.terofox.com17 18
Products
Double Flange Type Concentric Resilient Seated Series
Butterfly Valve.
BFV-702V series (BFV-702V / 712V / 722V)
Valve design in compliance with API609.
Face to face in accordance with EN558 series13.
Vulcanized seat is Terofox standard for double flange type.
Size range: DN50~DN2000.
Working Pressure
Resilient seated + Metal disc
2”~12” (DN50~DN300)
14”~24” (DN350~DN600)
230 psi (16 Bar)
150 psi (10 Bar)
Parts and material
Cast iron
Ductile Iron
Carbon Steel
Stainless Steel
Body
Disc
Stem
Seat
A126 Class B.
A536, A395 …
WCB,LCB …
CF8M, CF8, CF3M …
For other materials, please consult Terofox for your
specific application
BIDIRECTIONAL BUBBLE-TIGHT SHUT-OFF (Closed position)
245 psi (16 Bar)Body
Part name Material
C95400, C95500, C95800 …
A536 Nickel plated
A536 Nickel plated
WCB Nickel plated
CF8M, CF8, CF3M …
2507, 2205 …
Aluminum Bronze
Coated Ductile Iron
Nylon Coated Ductile Iron
Carbon Steel
Stainless Steel
Duplex Stainless Steel
410 Stainless Steel
431 Stainless Steel
304 Stainless Steel
316 Stainless Steel
NR
NBR (BUNA-N)
EPDM
NEOPRENE
CSM (HYPALON)
FKM (VITON)
PTFE
Figure 04. BFV-702V Cross-sectional
2” ~ 2-1/2”
(DN 50 ~ DN 65)
3” ~ 8”
(DN 80 ~ DN 200)
10” ~ 12”
(DN 250 ~ DN 300)
14” (DN350) 16” ~24”
(DN 400 ~ DN600)
Lug Type Shape
against Size

11. www.terofox.com19 20
BFV-73T0 / BFV-73T1 / BFV-73T3 PTFE Lining Concentric Butterfly Valves.
BFV-74T0 / BFV-74T1 / BFV-74T3 PTFE Lining Concentric Butterfly Valves With Slim-Disc.
T series
Valve design in compliance with API609 / EN 593.
Face to face in accordance with API 609 category A / EN 558 series20.
Size Range : DN50~DN900
Figure 06. BFV-74T3 Exploded View
U-Section Type Concentric Resilient Seated Series Butterfly Valve
BFV-703 series
U-section type design in compliance with EN 593.
Face to face in accordance with API 609 category A / EN 558 series20.
Size range : DN50~DN2000
Figure 05. BFV-703
PTFE seats and encapsulated discs are molded from pure virgin PTFE material
(thickness 3mm) providing optimum protection against permeation of the line media
and excellent corrosion resistance.

12. www.terofox.com21 22
Figure 07. BFV-74T3 Cross-sectional
DISC:
The PTFE lining disc has 3 mm minimum
thickness of pure, virgin PTFE encapsulated
over Stainless Steel.
SEAT DESIGN:
The seat design reduces seating unseating
torque-and minimizes wear on the contacting
parts. Curvatures machined into the inner
seat area minimize contact forces between
the disc and seat as the disc approaches, or
opens from, the closed position. This unique
seat geometry permits lower torques and
reduces seat wear.
FLANGE LOCATING HOLES:
Locating holes in the wafer version provide
quick and precise alignment during valve
installation eliminating disc interference with
adjacent pipe I.D.
BODY:
2-pc wafer design or lug style; epoxy coated.
NECK:
An extended neck design in all valve sizes
allows 2” of piping insulation and provides
easy access for mounting actuators.
TOP STEM BUSHING:
A top stem bushing, retained by a stainless steel
ring, is provided to absorb actuator side thrusts
and is acetal as standard or PTFE as an option.
The bushing assures the correct interaction
between the upper shaft and the lower shaft
while ensures the smooth running of the shaft.
SEAL CAPSULE(SECONDARY SEAL):
This seal capsule fully isolates the valve body and
stem from the line media. The Seal Capsule is made
of a virgin PTFE enclosing the internal energizer.
The capsule fits into grooves machined in the upper
and lower disc hubs. When compressed between the
disc and seat during assembly, the capsule becomes
energized, exerting both upward and downward
pressure on disc and seat surfaces.
PRIMARY SEAL:
The primary seal is achieved by an interference fit
between the extra wide disc hubs and contoured seat.
Disc spring, two sets for a group, is a state of
compressive deformation in the body. It will impose
elastic force on the press sleeve, compact the O-ring
and seat, improve axial sealing, then provided the
bearing stress for the seat and disc, to cover the
shortage of elasticity about PTFE seat.
1./
7./
8./
9./
2./
3./
4./
5./
SEAT ENERGIZER:
A resilient seat energizer extends completely
around the seat, including the disc hub; and
provides uniform force sufficient for bubble
tight shut off.
6./
1
5
6
7
8
9
3
4
2
Dovetail Type (Soft Back Seat) Concentric Resilient Seated Series
Butterfly Valve.
D series (BFV-700D / 701D ; BFV-710D / 711D)
Valve design in compliance with API609 / EN 593.
Face to face in accordance with API 609 category A / EN 558 series20.
Size range : DN50~DN600
Parts and material
Cast iron
Ductile Iron
Carbon Steel
Stainless Steel
Body
Disc
Stem
Seat
A126 Class B.
A536, A395 …
WCB,LCB …
CF8M, CF8, CF3M …
For other materials, please consult Terofox for your specific application
Part name Material
C95400, C95500, C95800 …
A536 Nickel plated
A536 Nickel plated
WCB Nickel plated
CF8M, CF8, CF3M …
2507, 2205 …
Aluminum Bronze
Coated Ductile Iron
Nylon Coated Ductile Iron
Carbon Steel
Stainless Steel
Duplex Stainless Steel
410 Stainless Steel
431 Stainless Steel
304 Stainless Steel
316 Stainless Steel
NR
NBR (BUNA-N)
EPDM
NEOPRENE
CSM (HYPALON)
FKM (VITON)

13. 2”
2-1/2”
3”
4”
5”
6”
8”
10”
12”
14”
16”
18”
20”
24”
(inch) (mm) ΔP 6 bar ΔP 10 bar ΔP 16 bar ΔP 6 bar ΔP 10 bar ΔP 16 bar
50
65
80
100
125
150
200
250
300
350
400
450
500
600
12
14
21
35
55
90
165
274
410
526
722
968
1291
2018
13
16
23
39
61
100
183
304
455
584
802
1075
1431
2242
14
18
24
42
66
109
204
343
521
663
899
1201
1520
2443
14
17
24
41
74
158
204
362
550
789
1083
1451
1936
3026
15
19
27
46
82
175
227
402
611
877
1203
1612
2151
3362
15
22
29
53
90
205
252
444
708
1030
1388
1898
2451
3941
SEAT:
Soft back seat design as known as
dovetail type seat which completely
encapsulates and isolates the body
isolating line medium and no flange
gaskets required. Dynamics of seat
based on being installed between
two flanges, making seat subject to
distortion during installation.
DISC:
Standard disc (with pin) and pinless disc both
available for soft back seat. Pinless disc are
operated in specific and stem and seal as
picture. If it is standard disc, then the standard
stem and seal would be the same as page 11.
WAFER / LUG BODY:
1-pc design body easy assembly andmaintenance.
Cast iron, ductile iron and carbon steel body with epoxy
powder coating.
Figure 08. BFV-710D Explode View
1./
2./
3./
STEM:
Specific stem design for pinless disc,
which can fix stem and body without
pin.
4./
SEAL RING:
Seal ring here is specific for soft back
seat, in order to strengthen the seal
between stem and body.
5./
www.terofox.com23 24
Technical Reference
Torque (value based on pins design)
Table 01. Torque Value (N.m) at Diacritical Working Pressure within Water and Air
Gear box data
Size Air fluidWater fluid
Ø
G
C
A
CLOSE
OPEN
B
n-M
D
E F
D1
Valve
Size
2”~6”
8”~10”
12”~14”
45
63
78
128
179
200
105
150
164
92
115/125
14/150
57
89/102
10/125
36
46
46
A B C D D1 E F ØG n-M
unit:mm
Output
Torque
Gear
Ratio
Diameter of
stem position
(Max.)
28
34
36
226
313
307
4-M6
4-M12/M10
4-M12/M10
150
300
300
150
500
1200
24:1
32:1
50:1
Ø20
Ø28
Ø35
1
1
4
5
3
2

14. www.terofox.com25 26
2”
2-1/2”
3”
4”
5”
6”
8”
10”
12”
14”
16”
18”
20”
24”
(inch) (mm) 10°
50
65
80
100
125
150
200
250
300
350
400
450
500
600
0.1
0.2
0.3
0.5
0.8
2
3
4
5
6
8
11
14
22
20°
5
8
12
17
29
45
89
151
234
338
464
615
971
1,222
30°
12
20
22
36
61
95
188
320
495
715
983
1,302
1,674
2,587
40°
24
37
39
78
133
205
408
694
1,072
1,549
2,130
2,822
3,628
5,605
50°
45
65
70
139
237
366
727
1,237
1,911
2,761
3,797
5,028
6,465
9,989
60°
64
98
116
230
392
605
1,202
2,047
3,162
4,568
6,282
8,320
10,698
16,528
70°
90
144
183
364
620
958
1,903
3,240
5,005
7,230
9,942
13,168
16,931
26,157
80°
125
204
275
546
930
1,437
2,854
4,859
7,507
10,844
14,913
19,752
25,396
39,236
90°
135
220
302
600
1,022
1,579
3,136
5,340
8,250
11,917
16,388
21,705
27,908
43,116
Technical Reference
CV (value based on pins design)
Table 02. CV Value chart (Flow in GPM at 1PSI P at Diacritical)
Material Applicable for Medium
Size Disc Opening Angles
GASOLINE
FRESH WATER
SEA WATER
STEAM
HYDROCHLORIC ACID (10%)
SULFURIC ACID (30%)
NITRIC ACID (10%)
SODIUM HYDROXIDE (30%)
ALCOHOL
×
○
◎
○
◎
○
×
◎
×
◎
○
○
×
○
△
×
◎
○
×
◎
◎
◎
◎
○
○
◎
◎
○
○
◎
○
◎
◎
×
○
×
◎
○
○
△
○
△
△
×
○
×
○
◎
○
◎
◎
○
◎
×
Medium Temperature -10 ~ 85˚C -10 ~ 80˚C -10~120˚C -5~90˚C -10~200˚C -10~135˚C
Material
CVvalue
0%
0 10
0,0%
10,0%
20,0%
30,7%
40,14%
50,24%
60,39%
70,61%
80,91%
90,100%
20 30 40 50 60 70 80 90
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Disc opening degree (˚)
NR NBR EPDM CR FKM CSM
◎ EXCELLENCE RESISTANT ○ GOOD RESISTANT △ CONDITIONALLY RESISTANT × NOT RECOMMENDED
For more application corrosion data, visit www.terofox.com/material.aspx.
For reference only
5
4
3
2
1
0
5
4
3
2
1
0
5
4
3
2
1
0
4
3
2
1
0
5
4
3
2
1
0
5
4
3
2
1
0
NR NBR EPDM
CR(Chloroprene Rubber) CSM(Hypalon) VITON(FKM)
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE
MECHANICAL
STRENGTH
ABRASION
RESISTANCE
OIL
RESISTANCE
ELEMENT
RESISTANCE
ACID AND
BASE
RESISTANCE
HIGH
TEMPERATURE
RESISTANCE
LOW
TEMPERATURE
RESISTANCE
FIRE
RESISTANCE

15. Figure 09. Flange Faces
STEP 01
CLEAN FACES!
Must make sure the pipe flange faces
are clean. Any foreign material such
as scars, welding slag, metal chips,
etc., can damage the seat or disc
and make disc blocked.
www.terofox.com27 28
Figure 11. Disc Position
Figure 10. Flanges Distance
Figure 12. Bolts Tighten Sequence
STEP 02
LEAVE ENOUGH SPACE!
Leave a space between flanges so that
valve can be easily inserted or removed,
and avoiding damaging the seat.
STEP 03
OPEN COMPLETELY!
Place the valve between the flanges and
center it, and then span the valve body
with all flange bolts, but do not tighten
the bolts. Carefully open the disc to the
full open position, making sure the disc
does not hit the pipe.
Assembling the butterfly vales in closed
position would deform the seat.
STEP 04
TIGHTEN BOLTS EQUALLY!
Tighten bolts gradually till flanges are in
contact with valve body, and must tighten
equally in sequence as Figure 21.
Installation & Maintenance
Terofox butterfly valves allow installation at any angle on the pipeline.
Installation Precaution
1.The valve shall be installed in proper position to ensure convenient operation, maintenance, and
replacement
2.In case of negligence in medium flow direction in pipe line, valve design allows installation in
double way.
3.Before/OFF installation, the butterfly valve should be stored in warehouse. Proper storage prevents
the valve from moisture while stored; the disc is suggested to be kept open at an angle of 15 degree.
4.Prior to installation, the following processes should be completed:
(1)Pay extra attention to check if the valve operation condition is in line with the technical
specification and requirements.
(2)Clean the disc sealing area and body sealing thoroughly. Disc should remain closed before
cleaning.
(3)Make sure the handle is firmly connected to the flange and stem.
5.As mounting the butterfly valve on pipeline, the load for tightening connection bolts should be
uniformed.
6.After installation, the disc must be opened in the case of the in-line strength pressure test being
carried out.
7.After commissioning, the valve should be examined regularly. Suggested regular checkups:
(1)Whether the valve seat and ‘O’ sealing ring have been damaged.
(2)Check the sealing effects of the disc sealing area.
(3)After the valve was examined and assembled, no scuffing happens at the time of on-off rotation.
(4)After the valve was examined and assembled, the sealing test should be carried out as the
introduction.
(5)After each examination, detailed records should be filed for future reference.
CORRECT! WRONG!
CORRECT! WRONG!
CORRECT! WRONG!

16. Figure 14. Unnecessary Gaskets
Figure 13. Incorrectiy Welding
Figure 15. Flange Rating
NOTE
WELDING BEFORE INSTALLED!
Do not weld flanges near by the installed
butterfly valve, so that must weld the pipe
before installation or remove the valve
before welding. Lastly must clean carefully
the welding slag to avoid damaging the
seat.
NOTE
DO NOT USE GASKETS!
The installation of a gasket between the
flange and the sleeve results in an
excessive deformation of the latter; this
has the effect of preventing the closure
of the disc, or block if it is already in the
closed position.
NOTE
DO NOT USE UNSUITABLE FLANGES!
The installation of unsuitable flanges
would jam the disc or create turbulences
in the pipe.
www.terofox.com29 30
Figure 17. Without Flange in the End Figure 18. With A Flange in the End
NOTE
HORIZONTAL AXIS INSTALLATION!
It would be better to install big size
butterfly valve with the stem horizontally.
In case of used in services with powders
or muddy fluids, valve must be installed
with the stem in horizontal position to
allow sediments to flow easily at opening.
NOTE
END PIPING INSTALLATION !
When valve installed at the end of piping:
Normally for
Dovetailseat type
and Vulcanized
seat type, we can
installing without
end flange.
Installing with a
blind flange in the
end to secure
tightness at max
pressure ( 16 bar )
and all types
butterfly valves.
Vertical axis installing
for general installation.
Horizontal axis installing
for particular fluids or
big size valves.
CORRECT!
WRONG!
WRONG!
WRONG!
Figure 16. Installation Axis

17. www.terofox.com31 32
50
65
80
100
125
150
200
250
300
350
400
450
500
600
4
4
8
8
8
8
8
12
12
16
16
20
20
20
4
4
8
8
8
8
12
12
12
16
16
20
20
20
130
140
140
150
150
165
175
185
195
195
220
250
290
324
130
140
140
150
150
165
175
185
195
195
220
250
290
324
4 x 2
4 x 2
8 x 2
8 x 2
8 x 2
8 x 2
8 x 2
12 x 2
12 x 2
16 x 2
16 x 2
20 x 2
20 x 2
20 x 2
4 x 2
4 x 2
8 x 2
8 x 2
8 x 2
8 x 2
12 x 2
12 x 2
12 x 2
16 x 2
16 x 2
20 x 2
20 x 2
20 x 2
M16 x 40
M16 x 45
M16 x 45
M16 x 50
M16 x 50
M20 x 50
M20 x 55
M20 x 60
M20 x 65
M20 x 65
M24 x 75
M24 x 80
M24 x 90
M27 x 100
M16 x 40
M16 x 45
M16 x 45
M16 x 50
M16 x 50
M20 x 50
M20 x 55
M24 x 60
M24 x 65
M24 x 65
M27 x 75
M27 x 80
M30 x 90
M33 x 100
M16 x 110
M16 x 120
M16 x 120
M16 x 130
M16 x 130
M20 x 140
M20 x 150
M20 x 160
M20 x 170
M20 x 170
M24 x 190
M24 x 220
M24 x 260
M27 x 290
M16 x 110
M16 x 120
M16 x 120
M16 x 130
M16 x 130
M20 x 140
M20 x 150
M24 x 160
M24 x 170
M24 x 170
M27 x 190
M27 x 220
M30 x 260
M33 x 290
(inch) Qty Dia x L1 Qty Dia x L1 Qty Dia x L1Length Qty Dia x L1 Length
Stud Bolt for Type of wafer valve Hexagon Heed Bolt for Type of Lug Stud Bolt for Type of wafer valve Hexagon Heed Bolt for Type of Lug
Bolts & Nuts Selection
MaintenanceEN 1092-1 PN10/16 ISO7005 PN10/16
ASME B 16.5 150LB JIS B2220 10K
Size
PN 10 PN 16
50
65
80
100
125
150
200
250
300
350
400
450
500
600
4
4
8
8
8
8
8
12
12
16
16
20
20
20
4
4
8
8
8
8
12
12
16
16
16
20
20
24
130
140
140
150
150
165
175
185
195
195
220
250
290
324
130
140
140
150
150
165
175
185
195
195
220
250
290
324
4 x 2
4 x 2
4 x 2
8 x 2
8 x 2
8 x 2
8 x 2
12 x 2
12 x 2
12 x 2
16 x 2
16 x 2
20 x 2
20 x 2
4 x 2
4 x 2
8 x 2
8 x 2
8 x 2
8 x 2
12 x 2
12 x 2
16 x 2
16 x 2
16 x 2
20 x 2
20 x 2
24 x 2
M16 x 40
M16 x 45
M16 x 45
M16 x 50
M16 x 50
M20 x 50
M20 x 55
M22 x 60
M22 x 65
M22 x 65
M24 x 75
M24 x 80
M24 x 90
M33 x 100
5/8” x 110
5/8” x 120
5/8” x 120
3/4” x 130
3/4” x 130
3/4” x 140
3/4” x 150
7/8” x 160
7/8” x 170
1” x 170
1” x 190
9/8” x 220
9/8” x 260
5/4” x 290
5/8” x 40
5/8” x 45
5/8” x 45
3/4” x 50
3/4” x 50
3/4” x 50
3/4” x 55
7/8” x 60
7/8” x 65
1” x 65
1” x 75
9/8” x 80
9/8” x 90
5/4” x 100
M16 x 110
M16 x 120
M16 x 120
M16 x 130
M16 x 130
M20 x 140
M20 x 150
M22 x 160
M22 x 170
M22 x 170
M24 x 190
M24 x 220
M24 x 260
M30 x 290
(inch) Qty Dia x L1 Qty Dia x L1 Qty Dia x L1Length Qty Dia x L1 Length
Stud Bolt for Type of wafer valve Hexagon Heed Bolt for Type of Lug Stud Bolt for Type of wafer valve Hexagon Heed Bolt for Type of Lug
Size
150 LB 10 K
1. Before the maintenance, always advise the maintenance personnel that the proper eye, head and whole
body protection always be utilized.
2. Before the maintenance, always make sure the pressure is released safely by partly opening the valve.
3. Prior to the maintenance, flush the butterfly valves and the pipe lines attached and make sure that no
(dangerous) residues are left.
4. Ensure that the installation, together with pressure containing parts in depressurized and secured.
5. It is impossible to predict the frequency of the maintenance interval. The maintenance interval is dependent
upon several factors which are not foreseeable by the manufacturer.
6. Operate the valve from fully open to fully close to assure its operation. Or always check the direction mark
on the lever or gear box operation.
7. Check flange bolting for any evidence of loose and make adjustment if necessary.
8. Inspect the valve and the surrounding area for previous or existing leakage at flange faces or shaft
connections.
9. Check piping and/or wiring to actuators and related equipment for looseness and correct as needed.
The following periodic preventative maintenance practices are recommended
for all center line butterfly valves.
Figure 19. Bolt Connection of Wafer / Lug Type Butterfly Valve
2 Thread pitch x 2 + Nut width x 2
+ Washer width x 2
+ Flang width x 2
+ Valve face-to-face
= Length
Washer width
+ Flang width
+ Min. Bolt Engagement
Equal to Bolt Diameter
= L1
Nut width
Washer width
Flang width
Valve face-to-face

18. www.terofox.com33 34
Any further questions, please contacts our service center info@terofox.com or
call us at+886-4-2265-5306
Troubleshooting
PROBLEMS SOLUTIONS
Leakage
from stem
Leakage from seat
(internal leak)
when closed
The disc does
not move
The valve does not
respond to
input signals.
(if the valve operated
by actuators.)
Hard to open
the valve
The valve
flow is low.
Check whether the seats are damaged.
Find if the stem O-rings are damaged.
Check whether any deviation between the valve and the pipe flange.
Check whether the disc can open and close fully.
Check whether the operator and the disc act synchronously.
If you suspect any damage to disc or seat, disassemble the valve. Visually
check disc and seat for damages, and replace them if any damage is found.
Check the air pressure supplied to the valve and the condition of the filter regulator.
Check the operations of accessories such as solenoid valve and air operated valve.
Disassemble the valve and check whether there are any foreign obstructions in disc
and seat.
Check the design temperature and actual line temperature.
Remove the actuator and try to operate the actuator only.
Check the air pressure supplied to the valve.
Check the voltage of the solenoid valve.
Apply the correct air pressure to the actuator to see whether it works properly or
leaks. (If it leaks, fasten the cylinder cover bolts.)
Disassemble the valve and check whether there are any foreign obstructions,
and remove them if found.
Clean and grease actuator if actuator parts are corroded.
Check whether there are any foreign obstruction in the upstream pipe.
Check whether the valve operates with the maximum stroke.