PVC Pneumatic Butterfly Valve
The Huiya PVC pneumatic butterfly valve — UPVC in DIN markets — is a large-bore, wafer-type automated valve for ambient-temperature water, seawater, and wastewater, sizes DN40 to DN500. For pipes above DN100, it’s far lighter and more economical than a flanged ball valve, and its universal slotted-hole flange fits ANSI, DIN, and JIS bolt patterns — one valve for piping systems worldwide. Completely immune to seawater and free chlorine, it’s a natural fit for desalination, pools, and municipal water.
Universal Flange: Fits ANSI, DIN & JIS
The slotted (elongated) bolt holes accommodate the bolt circle diameters of ANSI Class 150, DIN, and JIS at once — one wafer valve mounts between flanges of any of the three standards. No need to specify standard, and simpler inventory for multi-region projects.
Why a Wafer Butterfly Valve for Large Bores
For pipes larger than DN100 (4″), a flanged ball valve is heavy and expensive. A UPVC wafer butterfly valve takes a fraction of the installation space, cuts pipe-support load, needs only a small/cheap actuator, and isolates huge flow with a 90° quarter-turn in seconds. For ambient seawater and water service, it’s the most cost-effective large-bore choice — and immune to the corrosion that destroys metal valves.
Technical Specifications
| Specification | Detail |
| Valve Type | Wafer-type pneumatic butterfly valve, universal slotted flange |
| Body / Disc Material | UPVC (rigid PVC / PVC-U) |
| Size Range | DN40–DN500 |
| Flange Compatibility | Universal — ANSI Class 150, DIN, JIS (slotted holes) |
| Pressure Rating | PN10 (1.0 MPa) at ambient temperature |
| Max. Temperature | 60°C (140°F) |
| Disc | UPVC |
| Seat | EPDM or FKM (selected by media) |
| Actuator | Pneumatic, double-acting or spring-return, aluminum alloy |
Dimensions
| DN | H1 | H2 | L |
|---|---|---|---|
| 40 | 86 | — | 38 |
| 50 | 80 | 108 | 40 |
| 65 | 88 | 118 | 45 |
| 80 | 98 | 130 | 47 |
| 100 | 112 | 145 | 56 |
| 125 | 126 | 162 | 62 |
| 150 | 138 | 177 | 67 |
| 200 | 165 | 210 | 86 |
| 250 | 204 | 260 | 105 |
| 300 | 238 | 270 | 120 |
| 350 | 266 | 300 | 130 |
| 400 | 308 | 350 | 140 |
| 450 | 320 | 370 | 152 |
| 500 | 345 | 400 | 155 |
All dimensions in mm. H1 = height to stem center, H2 = overall height with actuator, L = face-to-face. Universal slotted flange fits ANSI Class 150, DIN, and JIS. Full flange drilling data on request.
Actuator Torque Requirements
| DN | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|---|---|---|---|
| N·m | 30 | 35 | 40 | 45 | 55 | 80 | 130 | 200 | 400 | 600 |
Break torque for actuator sizing (safety factor 1.2–2). DN350–DN500 torque data on request.
Chemical Compatibility
Same ambient-temperature compatibility as our other UPVC valves — water, seawater, dilute acids, alkalis, salts. EPDM seat for general media; FKM for oxidizers.
Applications
Common Selection Mistakes
Frequently Asked Questions
Q: Is PVC the same as UPVC?
Yes — UPVC (PVC-U) is rigid PVC. North America says “PVC,” DIN markets say “UPVC.”
Q: Does one valve fit ANSI, DIN, and JIS?
Yes — the slotted bolt holes fit all three patterns.
Q: Wafer or lugged?
Wafer type — mounts between two pipe flanges. The slotted holes fit ANSI, DIN, and JIS.
Q: Why a butterfly valve instead of a ball valve for large pipes?
Above DN100, butterfly valves are lighter, more compact, cheaper, and need a smaller actuator — ideal for large-bore water and seawater.
Q: Maximum temperature?
60°C. For hot service, upgrade to CPVC, PPH, or PVDF.
Q: Can it handle seawater?
Yes — UPVC is completely immune to seawater corrosion.
For hotter or more corrosive media, this butterfly valve is also made in CPVC, PPH and PVDF. Need tight shut-off or full-bore flow instead? See the PVC true union ball valve for serviceable small bores, or the PVC flanged ball valve for higher pressure. If you’re weighing materials, our Material Selection Service is free. View all PVC valves.