Disclaimer: The key technical parameters in this article are derived from the official technical documents of Ningjin APC Industries, a tier-one UL/FM fire protection valve manufacturer in China (serving as actual production references for Ningjin APC Industries factory fire valves and for customers to understand product usage; please consult our professional engineering team for specific inquiries).
1. Direct Factory Engineering & Made-to-Order Manufacturing
Partnering directly with a certified WD-371X Wafer Butterfly Valve Manufacturer / Supplier ensures full metallurgical traceability, strict pressure-testing compliance, and dimensional accuracy for compact flanged piping layouts. Ningjin APC Industries operates exclusively on a **made-to-order** production model rather than maintaining off-the-shelf warehouse stock, allowing every batch of wafer fire valves to be engineered precisely to project flange standards, exterior coating specs, and supervisory switch requirements.
2. Technical Specifications & Dual-Flange Compatibility
Engineered for indoor and outdoor fire protection systems, high-rise building fire fighting risers, industrial factory fire loops, and inflow/drain piping, every unit produced by our factory as a WD-371X Wafer Butterfly Valve Manufacturer / Supplier adheres to rigorous performance benchmarks:
- Flange Compatibility: Interfaces seamlessly between ANSI 125/150 and DIN 2501 PN10/16 pipe flanges
- Nominal Size Range: Manufactured across 2", 2½", 3", 4", 5", 6", 8", 10", and 12" diameters
- Maximum Working Pressure: 300 PSI (2.1 MPa) continuous operating rating
- Maximum Testing Pressure: 600 PSI factory hydrostatic shell and seat test
- Pressure & Structural Standards: Conforms to UL 1091, ULC/ORD-C1091, and FM 1112
- Working Temperature Range: 0 ~ 80°C (32 ~ 176°F)
- Top Flange & Certifications: ISO 5211 top flange; certified to UL, CUL, FM, VdS, CE, CCC, and optional NSF/ANSI 61 & NSF/ANSI 372 lead-free compliance
3. Signal Gearbox & Mechanical Reduction Ratios
To prevent accidental closure and eliminate destructive water hammer in pressurized sprinkler mains, the WD-371X incorporates a weather-sealed ductile iron signal gearbox with factory-prewired internal micro-switches for real-time Fire Alarm Control Panel (FACP) monitoring:
| Nominal Valve Size | Gear Reduction Ratio | Handwheel Diameter (ΦD) | Supervisory Switch Output |
|---|---|---|---|
| 2" – 5" | 24:1 | 152 mm | Dual Internal Micro-Switches (FACP Ready) |
| 6" | 24:1 | 200 mm | Dual Internal Micro-Switches (FACP Ready) |
| 8" – 10" | 30:1 | 300 mm | Dual Internal Micro-Switches (FACP Ready) |
| 12" | 80:1 | 350 mm | Dual Internal Micro-Switches (FACP Ready) |
4. Complete Valve Bill of Materials (BOM)
As a verified WD-371X Wafer Butterfly Valve Manufacturer / Supplier, our component metallurgy is engineered to prevent stem seizure and maintain bubble-tight shutoff across decades of service:
| No. | Component Description | Material Specification |
|---|---|---|
| 1 | Upper Shaft Sealing Nut | WCB |
| 2 | Shaft Seal | EPDM |
| 3 | Body | Ductile Iron |
| 4 | Upper Shaft | 416 Stainless Steel |
| 5 | Disc + Rubber Seat | Ductile Iron + EPDM Encapsulated |
| 6 | Lower Shaft | 416 Stainless Steel |
| 7 | Lower Shaft Sealing Nut | WCB |
| 8 | End Face Seal | EPDM |
| 9 | Stem Bushing | PTFE / C95400 |
| 10 | O-Ring | EPDM |
5. Frequently Asked Questions (FAQ)
The WD-371X is designed for indoor and outdoor fire protection systems, high-rise vertical risers, industrial plant fire loops, and inflow/drain piping utilizing ANSI 125/150 or DIN PN10/16 flanges at up to 300 PSI and 0 to 80°C.
It holds full UL, CUL, FM, VdS, CE, and CCC certifications, alongside optional NSF/ANSI 61 & 372 lead-free listings, ensuring effortless acceptance by Authorities Having Jurisdiction (AHJ) worldwide.
Yes. Its dual ANSI/DIN flange compatibility, 300 PSI/600 PSI pressure ratings, 416 stainless steel shafts, and UL/FM compliance match leading Western specifications.
It conforms to US UL 1091 and FM 1112 standards, ANSI 125/150 and European DIN 2501 PN10/16 flange rules, and ISO 5211 top flange mounting benchmarks.
The standard warranty period is generally 18 months. Please verify specific project terms with your sales representative.
No off-the-shelf inventory is stocked; all units are manufactured strictly made-to-order with a standard delivery lead time of 6 to 9 weeks.
