Coliter ® Worm Gear Wafer Butterfly Valve – PN16, -10~80°C, Compact Flow Control for Water & Light Industrial Systems
D371X Worm Gear Wafer Butterfly Valve – Ductile Iron Body with Stainless Steel Disc and NBR/EPDM Seal for Efficient On-Off & Throttling
The Coliter® D371X Worm Gear Wafer Butterfly Valve is a compact, cost-effective solution for flow regulation and shut-off in water supply, drainage, HVAC, fire protection, and light industrial pipelines handling media such as water, air, and weakly corrosive fluids. Designed in a wafer-style configuration, it installs between pipe flanges without end connections, significantly reducing weight, space, and installation cost. Operation is via a worm gear actuator, enabling smooth, low-torque control even at larger sizes (DN50–DN600), with clear open/close indication and reliable mechanical advantage. The valve features a nodular (ductile) cast iron body, a corrosion-resistant stainless steel disc and shaft, and a replaceable elastomer seat made of NBR, EPDM, PTFE, or silicone rubber—selected based on temperature and chemical compatibility—ensuring bubble-tight sealing and long service life. Rated at PN16 (1.6 MPa), it undergoes shell testing at 2.4 MPa and seal testing at 1.76 MPa, and operates reliably within a temperature range of -10℃ to 80℃ (up to 120℃ with EPDM). Compliant with standards GB/T 12238 and ISO 5752, the D371X offers excellent flow characteristics, bidirectional sealing, and minimal fluid resistance. Its unique structure allows it to transport slurry with minimal liquid retention at the pipeline mouth, making it ideal for applications requiring efficient, low-maintenance flow control.
Installation diagram
Product Description
| DN | A | B | C | D | L | H | D1 | n-Φ | K | E | n1-Φ1 | Φ2 | G | f | J | X | |
| mm | inch | ||||||||||||||||
| 50 | 2 | 161 | 80 | 43 | 52.9 | 32 | 84.84 | 125 | 4-23 | 77 | 57.15 | 4-6.7 | 12.6 | 100 | 13 | 13.8 | 3 |
| 65 | 2.5 | 175 | 89 | 46 | 64.5 | 32 | 96.2 | 145 | 4-26.5 | 77 | 57.15 | 4-6.7 | 12.6 | 120 | 13 | 13.8 | 3 |
| 80 | 3 | 181 | 95 | 46 | 78.8 | 32 | 61.23 | 160 | 8-18 | 77 | 57.15 | 4-6.7 | 12.6 | 127 | 13 | 13.8 | 3 |
| 100 | 4 | 200 | 114 | 52 | 104 | 32 | 70.8 | 180 | 4-24.5 | 92 | 69.85 | 4-10.3 | 15.77 | 156 | 13 | 17.77 | 5 |
| 125 | 5 | 213 | 127 | 56 | 123.3 | 32 | 82.28 | 210 | 4-23 | 92 | 69.85 | 4-10.3 | 18.92 | 190 | 13 | 20.92 | 5 |
| 150 | 6 | 226 | 139 | 56 | 155.6 | 32 | 91.08 | 240 | 4-25 | 92 | 69.85 | 4-10.3 | 18.92 | 212 | 13 | 20.92 | 5 |
| 200 | 8 | 260 | 175 | 60 | 202.5 | 45 | 112.89 76.35 | 295 | 4-25 4-23 | 115 | 88.9 | 4-14.3 | 22.1 | 268 | 13 | 24.1 | 5 |
| 250 | 10 | 292 | 203 | 68 | 250.5 | 45 | 92.4 | 350 355 | 4-29 | 115 | 88.9 | 4-14.3 | 28.45 | 325 | 13 | 31.45 | 8 |
| 300 | 12 | 337 | 242 | 78 | 301.6 | 45 | 105.34 | 400 410 | 4-29 | 140 | 107.95 | 4-14.3 | 31.6 | 403 | 20 | 34.6 | 8 |
| 350 | 14 | 368 | 267 | 78 | 333.3 | 45 | 91.11 | 460 470 | 4-30 | 140 | 107.95 | 4-14.3 | 31.6 | 436 | 20 | 34.6 | 8 |
| 400 | 16 | 400 | 309 | 86 102 | 440.52 | 51.2 72 | 100.47 102.42 | 515 525 | 4-26 4-30 | 197 | 158.75 | 4-20.6 | 33.15 | 488 | 20 | 36.15 | 10 |
| 450 | 18 | 422 | 328 | 105 114 | 440.51 | 51.2 72 | 88.39 91.51 | 565 585 | 4-26 4-30 | 197 | 158.75 | 4-20.6 | 37.95 | 536 | 20 | 41 | 10 |
| 500 | 20 | 480 | 361 | 127 | 491.6 | 64.2 82 | 86.99 101.68 | 620 650 | 4-26 4-33 | 197 | 158.75 | 4-20.6 | 41.15 | 590 | 22 | 44.15 | 10 |
| 600 | 24 | 562 | 459 | 154 | 592.5 | 70.2 82 | 113.42 120.46 | 725 770 | 20-30 20-36 | 276 | 215.9 | 4-22.2 | 50.65 | 816 | 22 | 54.65 | 16 |
Suitable for regulating flow and intercepting medium in water supply and drainagepipelines such as food, medicine, light textile, and papermaking.
1. Convenient and fast opening and closing, labor-saving and agile, with low flowresistance, can be installed in any position, and is easy to operate and maintain.
2. Unique structure and good low-pressure sealing performance.
3. The sealing element can be replaced, and the sealing material is resistant to aging,weak corrosion, and long service life
4. It can transport mud and store the least liquid at the pipeline mouth.
5. Good regulation, interception, and check performance.
Main performance specification
| Nominal pressure | 1.6MPa |
| Nominal size | 50~60mm |
| Shell test | 2.4MPa |
| Sealing test | 1.76MPa |
| Temperature | -10~80°C |
| Applicable medium | Water |
Materials of main parts
| Part name | Material |
| Valve body | Nodular cast iron |
| Seat tightness | Nitrile, ethylene propylene, polytetrafluroethylene, silicone rubber |
| Disc | Stainless steel |
| Valve shaft | Stainless steel |
Product Inquiry
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Faq - Frequent questions
Introduction to Wafer butterfly valve
Coliter®’s wafer butterfly valves offer efficient, cost-effective flow isolation and regulation in water supply, HVAC, fire protection, and industrial pipelines. The series includes the D71X manual wafer type, D371X worm gear operated model, D6/971X pneumatic/electric actuated versions, and high-performance D373H stainless steel hard-sealed valve. Featuring a compact wafer design that fits between flanges without end connections, these valves use EPDM, NBR, or PTFE seals for bubble-tight shut-off and are available in cast iron, ductile iron, or stainless steel bodies. Rated at PN10/PN16 (1.0–1.6 MPa) with operating temperatures from -10°C to 120°C (up to 200°C for metal-seated types), they comply with ISO 5752 and GB/T 12238 standards—ideal for space-constrained installations requiring low torque, quick operation, and reliable sealing.
