Valve Standards: ANSI vs DIN vs JIS – Which One Do You Need?
ANSI, DIN, JIS… When you’re sourcing valves internationally, the number of standards can be confusing. Order the wrong one, and the flange won’t match your piping — or worse, it’ll arrive on site and you can’t install it. As a valve manufacturer that exports to 50+ countries, we’ll break down the three main valve standards in simple terms, so you know exactly what to order.
1. The Three Main Valve Standard Systems
There are three major valve and flange standards used worldwide, each dominating a different region:
| Standard | Origin | Main Markets | Flange Standard |
|---|---|---|---|
| ANSI / ASME | United States | USA, Canada, Middle East, Southeast Asia | ASME B16.5 / B16.47 |
| DIN / EN | Germany / Europe | EU, UK, Australia, China (domestic) | EN 1092 / DIN 2527 |
| JIS | Japan | Japan, South Korea, Taiwan | JIS B2220 / B2239 |
2. Flange Face-to-Face Dimensions
The most important difference is the flange dimensions — the bolt circle diameter, number of bolts, and flange thickness. If your valve flange doesn’t match your piping flange, you can’t connect them directly.
| Size | ANSI Class 150 (B16.5) | DIN PN16 (EN1092) | JIS 10K (B2220) |
|---|---|---|---|
| 2″ / DN50 | Bolt circle: 120mm, 4 bolts | Bolt circle: 125mm, 4 bolts | Bolt circle: 120mm, 4 bolts |
| 4″ / DN100 | Bolt circle: 190mm, 8 bolts | Bolt circle: 180mm, 8 bolts | Bolt circle: 190mm, 8 bolts |
| 6″ / DN150 | Bolt circle: 241mm, 8 bolts | Bolt circle: 240mm, 8 bolts | Bolt circle: 240mm, 8 bolts |
Notice how close the dimensions are — but not identical. That’s why you can’t just mix and match. A 2″ ANSI flange bolt circle is 120mm, but DIN PN16 is 125mm. The bolts won’t line up.
3. Pressure Rating Comparison
Each standard uses a different pressure rating system. Here’s how they roughly compare at room temperature:
| ANSI Class | DIN / EN PN | JIS | Equivalent PSI |
|---|---|---|---|
| Class 150 | PN16 | 10K | ~230 PSI |
| Class 300 | PN40 | 20K | ~580 PSI |
| Class 600 | PN100 | 40K | ~1450 PSI |
Important note: These are approximate equivalents. At higher temperatures, the pressure ratings diverge more — always check the pressure-temperature chart for your specific application.
4. Which Standard Should You Choose?
Here’s how to decide which standard to order:
Use ANSI/ASME if:
• Your project is in USA, Canada, or the Middle East (Saudi Arabia, UAE, Qatar)
• You’re replacing equipment that already uses ANSI flanges
• Your client or EPC contractor specifies ANSI in the tender
Use DIN/EN if:
• Your project is in Europe, UK, Australia, or Southeast Asia
• You’re buying from China (most Chinese factories default to DIN/EN)
• Your system uses metric piping (mm sizes instead of inches)
Use JIS if:
• Your project is in Japan, South Korea, or Taiwan
• You’re replacing Japanese-made equipment (Kubota, Hitachi, etc.)
• The end user specifically requires JIS certification
Common Mistakes to Avoid
Mistake 1: Assuming “Class 150 = PN16” means they’re identical. They’re close in pressure, but the flange dimensions are different. You still can’t bolt them directly together without a flange adapter.
Mistake 2: Not specifying the standard on your RFQ. Just saying “2 inch ball valve, PN16” isn’t enough. You need to say “2 inch flanged ball valve, PN16, EN1092-1, face-to-face EN558-1 Series 1.” Otherwise the manufacturer might send you ANSI by default.
Mistake 3: Forgetting about face-to-face dimensions. Even within the same standard, different valve types have different face-to-face lengths. If you’re replacing an existing valve, always specify the face-to-face dimension, not just the size.
Not sure which standard your project needs? Tell us your destination country and equipment — we’ll recommend the right specification within 24 hours.