Coliter ® Stainless Steel Soft Seal Wafer Butterfly Valve – PN1.0~1.6, -23~121°C, Bubble-Tight Shut-Off for Water, Sewage & Gas
D371X Stainless Steel Soft Seal Wafer Butterfly Valve – Compact Wafer Design with Full Stainless Steel Body and EPDM/NBR Elastomer Seal
The Coliter® D371X Stainless Steel Soft Seal Wafer Butterfly Valve is a high-performance butterfly valve designed for reliable flow regulation and tight shut-off in water supply, sewage treatment, HVAC, building systems, data centers, and gas pipelines. Constructed entirely from corrosion-resistant materials—stainless steel (CF8/CF8M) for the body and disc, carbon steel or stainless steel for the stem, and a resilient rubber (EPDM, NBR, or silicone) seat—it ensures long service life even in aggressive or outdoor environments. The valve features a wafer-style design, allowing it to be clamped directly between pipeline flanges without end connections, significantly reducing weight, space, and installation cost. Rated for PN1.0 to PN1.6 (1.0–1.6 MPa), it operates reliably across a wide temperature range of -23℃ to 121℃ (depending on seal material). With a 0°–90° quarter-turn operation via worm gear actuator, it provides smooth, low-torque control and clear open/close indication. Compliant with standards GB/T 12238 and ISO 5752, the D371X offers bidirectional sealing, minimal pressure drop, and excellent flow characteristics. Ideal for applications requiring hygiene, corrosion resistance, and zero leakage, this valve delivers maintenance-free performance in municipal, industrial, and commercial fluid systems.
Installation diagram
Product Description
| DN | A | B | C | L | D1 | n-Φ | K | E | n1-Φ1 | G |
| 50 | 161 | 80 | 43 | 32 | 125 | 4-23 | 77 | 57.15 | 4-6.7 | 100 |
| 65 | 175 | 89 | 46 | 32 | 145 | 4-26.5 | 77 | 57.15 | 4-6.7 | 120 |
| 80 | 181 | 95 | 46 | 32 | 160 | 8-18 | 77 | 57.15 | 4-6.7 | 127 |
| 100 | 200 | 114 | 52 | 32 | 180 | 4-24.5 | 92 | 69.85 | 4-10.3 | 156 |
| 125 | 213 | 127 | 56 | 32 | 210 | 4-23 | 92 | 69.85 | 4-10.3 | 190 |
| 150 | 226 | 139 | 56 | 32 | 240 | 4-25 | 92 | 69.85 | 4-10.3 | 212 |
| 200 | 260 | 175 | 60 | 45 | 295 | 4-25 4-23 | 115 | 88.9 | 4-14.3 | 268 |
| 250 | 292 | 203 | 68 | 45 | 350 355 | 4-29 | 115 | 88.9 | 4-14.3 | 325 |
| 300 | 337 | 242 | 78 | 45 | 400 410 | 4-29 | 140 | 107.95 | 4-14.3 | 403 |
| 350 | 368 | 267 | 78 | 45 | 460 470 | 4-30 | 140 | 107.95 | 4-14.3 | 436 |
| 400 | 400 | 309 | 86 102 | 51.2 72 | 515 525 | 4-26 4-30 | 197 | 158.75 | 4-20.6 | 488 |
| 450 | 422 | 328 | 105 114 | 51.2 72 | 565 585 | 4-26 4-30 | 197 | 158.75 | 4-20.6 | 536 |
| 500 | 480 | 361 | 127 | 64.2 82 | 620 650 | 4-26 4-33 | 197 | 158.75 | 4-20.6 | 590 |
| 600 | 562 | 459 | 154 | 70.2 82 | 725 770 | 20-30 20-36 | 276 | 215.9 | 4-22.2 | 816 |
The butterfly plate of the clamp type butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly plate rotates around the axis, with a rotation angle of 0 ° -90 °, which can play a role in flow regulation. When the butterfly plate rotates to 90 °, the valve reaches its maximum opening.
Suitable for regulating and intercepting medium pipelines in data centers, building HVAC, tap water systems, sewage energy systems, buildings, etc.
Main performance specification
| Nominal diameter | DN50-800 |
| Nominal pressure PN(MPa) | 1.0-1.5 |
| Applicable temperature | -23～121℃ |
| Applicable medium | Fresh water, sewage, sea water, gas, etc |
Materials of main parts
| Part Name | Material name |
| valve body | Stainless steel |
| Valve plate | Stainless steel |
| Valve spindle | Carbon steel, stainless steel |
| valve seat | rubber |
| seal up | O-ring |
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.
