Complete engineering database for industrial valve dimensions. Interactively look up Face-to-Face (F2F) lengths,
ASME B16.5 flange patterns, API 598 test pressures, and ASTM material recommendations for major international valve standards
including API 609, ASME B16.10, API 6D, and API 602.
Valve Specification & Dimensions Finder
Engineering Note on API 609 Butterfly Valves: According to the official **API Standard 609 (Ninth Edition, 2021)**, for Category B (High-Performance Offset) **Wafer & Lug-type** valves, the standard Face-to-Face (F2F) dimension for a **3-inch (NPS 3 / DN 80) Class 150/300** valve is exactly **48 mm (1.88 inches)**, and for **Class 600** it is **54 mm (2.12 inches)**. A face-to-face dimension of **57 mm (2.25 inches)** belongs to a **6-inch (NPS 6) Class 150** Wafer/Lug valve. Double-flanged patterns are covered under separate tables (e.g. 3-inch Class 150 Long Pattern is 203 mm). Use the finder below to query exact standard-compliant dimensions.
Input Parameters
High-Performance Offset Butterfly Valve (API 609 Cat B)
Double/triple offset high-performance butterfly valves. Wafer, lug, or flanged designs.
57
Face-to-Face (mm)
2.25
Face-to-Face (inch)
Short Pattern Option: Wafer/Lug short pattern F2F for this size is 48 mm (1.88").
Specification Details
Dimensional Standard
API 609 Category B
Standard Connections
Wafer / Lug / Flanged
ASME B16.5 Mating Flange
OD: 190 mm | Bolt Circle: 152.4 mm | Holes: 4 | Size: 5/8"
Flange Nominal Thickness
23.9 mm
API 598 Test Pressures
Shell: 31 bar | Seat Hydro: 22 bar | Seat Air: 6 bar
Recommended ASTM Materials
ASTM A216 WCB (Body) | SS316 Disc | PTFE Seat
API 609 Butterfly Valve Dimensions Reference
API 609 specifies the design, pressure-temperature ratings, and dimensions of butterfly valves.
It is split into two distinct categories: Category A (Concentric rubber-lined valves) and Category B (Eccentric/High-Performance offset valves).
Why does F2F matter? Butterfly valves feature a compact, space-saving design compared to gate and globe valves.
According to **API Standard 609 (Ninth Edition, 2021)**:
For **Wafer and Lug-type Category B valves** (Table 3a), there is only one standard F2F dimension per class. For a **3-inch (DN 80) Class 150/300** valve, the F2F length is exactly **48 mm (1.88")**. A face-to-face of **57 mm (2.25")** belongs to a **6-inch (DN 150) Class 150** Wafer/Lug valve.
For **Double-Flanged Category B valves**, F2F lengths are divided into **Long Pattern** (Table 3b, matching ASME B16.10 gate valves) and **Short Pattern** (Table 3c, matching ISO 5752 series 13/14).
API 609 Table 3a: F2F Dimensions for Category B Wafer & Lug Valves
Nominal Size (NPS)
Nominal Size (DN)
Class 150 F2F Length
Class 300 F2F Length
Class 600 F2F Length
3"
DN 80
48 mm (1.88") ★
48 mm (1.88") ★
54 mm (2.12") ★
4"
DN 100
54 mm (2.12")
54 mm (2.12")
64 mm (2.50")
6"
DN 150
57 mm (2.25") ✦
59 mm (2.31")
78 mm (3.06")
8"
DN 200
64 mm (2.50")
73 mm (2.88")
102 mm (4.00")
10"
DN 250
71 mm (2.81")
83 mm (3.25")
117 mm (4.62")
12"
DN 300
81 mm (3.19")
92 mm (3.62")
140 mm (5.50")
14"
DN 350
92 mm (3.62")
117 mm (4.62")
155 mm (6.12")
16"
DN 400
102 mm (4.00")
133 mm (5.25")
178 mm (7.00")
18"
DN 450
114 mm (4.50")
149 mm (5.88")
200 mm (7.88")
20"
DN 500
127 mm (5.00")
159 mm (6.25")
216 mm (8.50")
24"
DN 600
154 mm (6.06")
181 mm (7.12")
232 mm (9.13")
API 609 Tables 3b & 3c: F2F Dimensions for Category B Double-Flanged Valves
ASME B16.10 covers face-to-face and end-to-end dimensions of straightway valves.
Its purpose is to ensure installation interchangeability for valves of a given material, type, size, rating, and end connection.
Class 150 Flanged Raised Face (RF) Valves (NPS 2" to 24")
Size (NPS)
Size (DN)
Gate Valves (API 600)
Globe Valves (BS 1873)
Ball Valves (API 6D/608)
Swing Check (BS 1868)
2"
DN 50
178 mm (7.00")
203 mm (8.00")
178 mm (7.00")
203 mm (8.00")
2-1/2"
DN 65
190 mm (7.50")
216 mm (8.50")
190 mm (7.50")
216 mm (8.50")
3"
DN 80
203 mm (8.00")
241 mm (9.50")
203 mm (8.00")
241 mm (9.50")
4"
DN 100
229 mm (9.00")
292 mm (11.50")
229 mm (9.00")
292 mm (11.50")
6"
DN 150
267 mm (10.50")
406 mm (16.00")
394 mm (15.50")
356 mm (14.00")
8"
DN 200
292 mm (11.50")
495 mm (19.50")
457 mm (18.00")
495 mm (19.50")
10"
DN 250
330 mm (13.00")
622 mm (24.50")
533 mm (21.00")
622 mm (24.50")
12"
DN 300
356 mm (14.00")
698 mm (27.50")
610 mm (24.00")
698 mm (27.50")
Class 300 Flanged Raised Face (RF) Valves (NPS 2" to 12")
Size (NPS)
Size (DN)
Gate Valves (API 600)
Globe Valves (BS 1873)
Ball Valves (API 6D/608)
Swing Check (BS 1868)
2"
DN 50
216 mm (8.50")
267 mm (10.50")
216 mm (8.50")
267 mm (10.50")
2-1/2"
DN 65
241 mm (9.50")
292 mm (11.50")
241 mm (9.50")
292 mm (11.50")
3"
DN 80
283 mm (11.12")
318 mm (12.50")
283 mm (11.12")
318 mm (12.50")
4"
DN 100
305 mm (12.00")
356 mm (14.00")
305 mm (12.00")
356 mm (14.00")
6"
DN 150
403 mm (15.88")
444 mm (17.50")
403 mm (15.88")
444 mm (17.50")
8"
DN 200
419 mm (16.50")
559 mm (22.00")
502 mm (19.75")
533 mm (21.00")
10"
DN 250
457 mm (18.00")
622 mm (24.50")
568 mm (22.38")
622 mm (24.50")
12"
DN 300
502 mm (19.75")
711 mm (28.00")
648 mm (25.50")
711 mm (28.00")
API 602 Compact Forged Valve Dimensions (Class 800 / 1500)
API 602 specifies dimensions and design criteria for small compact forged steel gate, globe, and check valves.
These valves are widely used in auxiliary systems and high-pressure steam, refinery, or hydrocarbon processing piping,
typically featuring threaded (NPT) or socket-weld (SW) ends.
An engineer's quick reference to critical international standards governing valve construction, testing, dimensions, and metallurgy.
API Standards American Petroleum Institute
API 600: Cast Steel Gate Valves. Focuses on bolted bonnets, heavy wall thicknesses for petroleum/natural gas refinery services. API 602: Compact forged gate, globe, and check valves up to NPS 4" for high pressure. API 609: Butterfly valves (soft-seated concentric Category A, and high-performance eccentric Category B). API 6D: Pipeline valves (ball, gate, check, plug). Governs transportation and transmission pipelines. API 598: Valve Inspection and Testing. Standard for hydrostatic shell, seat, and air tests.
ASME / ANSI Standards American Society of Mechanical Engineers
ASME B16.34: Valves Flanged, Threaded, and Welding End. Establishes pressure-temperature rating limits, wall thickness minimums, and testing parameters. ASME B16.10: Face-to-Face and End-to-End Dimensions of Ferrous Valves. Governs physical replacement interchangeability. ASME B16.5: Pipe Flanges and Flanged Fittings. Standard for bolt patterns, bolt circle sizes, and flange thicknesses (NPS 1/2" to 24"). ASME B16.47: Large Diameter Flanges (NPS 26" to 60" Series A and B).
ASTM Materials American Society for Testing and Materials
ASTM A216 WCB: Standard grade for cast carbon steel body valves in non-corrosive service up to 425°C. ASTM A351 CF8M / CF8: Standard cast austenitic stainless steel grade (CF8M = SS316, CF8 = SS304) for corrosive or cryogenic systems. ASTM A105: Standard forged carbon steel grade for small piping valves, fittings, and flanges. ASTM A182 F316 / F304: Forged stainless steel alloys matching CF8M and CF8. ASTM A536 / A48: Ductile iron (A536) and grey cast iron (A48) body specifications.
BS / ISO Standards British Standards & International Standards
BS 1873: Cast steel globe and globe stop check valves (bolted bonnet, flanged/butt-weld ends). BS 1868: Cast steel swing check valves. ISO 5752: Metal valves for use in flanged pipe systems. Establishes metric face-to-face series. ISO 5211: Part-turn actuator mounting details (essential for automated ball and butterfly valves).
ANSI / ASME B16.5 Flange & Bolting Dimensions
ASME B16.5 governs the dimensions, bolt patterns, hole diameters, and thicknesses of pipe flanges and flanged fittings (NPS 1/2" to 24").
These measurements define the mating parameters of flanged industrial valves.
ASME B16.5 Class 150 Flange Mating & Bolt Specs
NPS (Inches)
DN (mm)
Flange OD (mm)
Bolt Circle (mm)
Bolt Holes Qty
Bolt Diameter (in)
Flange Thickness (mm)
1/2"
DN 15
90 mm
60.3 mm
4
1/2"
11.2 mm
3/4"
DN 20
100 mm
69.9 mm
4
1/2"
12.7 mm
1"
DN 25
110 mm
79.4 mm
4
1/2"
14.3 mm
1-1/2"
DN 40
125 mm
98.4 mm
4
1/2"
17.5 mm
2"
DN 50
152 mm
120.7 mm
4
5/8"
19.1 mm
2-1/2"
DN 65
178 mm
139.7 mm
4
5/8"
22.3 mm
3"
DN 80
190 mm
152.4 mm
4
5/8"
23.9 mm
4"
DN 100
229 mm
190.5 mm
8
5/8"
23.9 mm
6"
DN 150
279 mm
241.3 mm
8
3/4"
25.4 mm
8"
DN 200
343 mm
298.5 mm
8
3/4"
28.6 mm
10"
DN 250
406 mm
362.0 mm
12
7/8"
30.2 mm
12"
DN 300
483 mm
431.8 mm
12
7/8"
31.8 mm
ASME B16.5 Class 300 Flange Mating & Bolt Specs
NPS (Inches)
DN (mm)
Flange OD (mm)
Bolt Circle (mm)
Bolt Holes Qty
Bolt Diameter (in)
Flange Thickness (mm)
1/2"
DN 15
95 mm
66.7 mm
4
1/2"
14.3 mm
3/4"
DN 20
117 mm
82.6 mm
4
5/8"
15.9 mm
1"
DN 25
124 mm
88.9 mm
4
5/8"
17.5 mm
1-1/2"
DN 40
156 mm
114.3 mm
4
3/4"
20.7 mm
2"
DN 50
165 mm
127.0 mm
8
5/8"
22.3 mm
3"
DN 80
210 mm
168.3 mm
8
3/4"
28.6 mm
4"
DN 100
254 mm
200.2 mm
8
3/4"
31.8 mm
6"
DN 150
318 mm
269.9 mm
12
3/4"
36.6 mm
8"
DN 200
381 mm
330.2 mm
12
7/8"
41.3 mm
10"
DN 250
444 mm
387.4 mm
16
1"
47.7 mm
12"
DN 300
521 mm
450.9 mm
16
1-1/8"
50.8 mm
ASTM Metallurgy & Material Equivalents
Industrial valves are manufactured from various ASTM material grades to resist mechanical stress, pressure, high temperature, and chemical corrosion.
Below is a standard casting-to-forging equivalents table for common valve body and trim metallurgies.
ASTM Castings, Forgings, and Temperature Reference
Material Type
Casting Grade (ASTM)
Forging Equivalent (ASTM)
Temperature Limits
Standard Service Application
Carbon Steel
ASTM A216 WCB / WCC
ASTM A105
-29°C to 425°C
Non-corrosive fluids, steam, hot water, hydrocarbons.
