MH-XQH 300 Swin Check Valve Flanged End 300 PSI
The MH-XQH-300 Swing Check Valve is a flanged-end fire protection valve designed to automatically prevent backflow in high-pressure water pumping systems, sprinkler installations, and high-rise standpipe lines. Originally manufactured under the Ningjin APC Industries brand, this industry-standard model is distributed globally by major fire protection equipment providers.
Description
⚙️ Core Technical Specifications
| Parameter | Specification Details |
|---|---|
| Model Designation | MH-XQH-300 |
| Size Range | Available from 2″ to 12″ (DN50 to DN300) |
| Working Pressure | Rated up to 300 PSI (20.7 bar) maximum working pressure |
| Testing Pressure | Hydrostatic Shell Test: 600 PSI (41.4 bar) |
| Working Temperature | 0°C to 80°C (32°F to 176°F) standard |
| Face-to-Face Standard | Complies with ASME B16.10 |
| Flange End Connections | Flat-faced/raised flanges matching ASME/ANSI B16.1 Class 125, B16.42 Class 150, BS EN1092-2 PN16, or GB/T9113.1 |
🧱 Material Composition
-
- Valve Body & Bonnet: High-strength Ductile Iron
- Clapper / Disc: Ductile Iron fully encapsulated in resilient EPDM rubber for a bubble-tight, zero-leakage shutoff
- Stems/Shafts: Corrosion-resistant Stainless Steel 304 (Primary and Middle stems)
- Seat Ring & Baffle Plate: High-grade Aluminum Bronze (C95400)
- Bushings: Powder metallurgy bronze for prolonged cycle life
- Protective Coating: High-durability electrostatically applied Fusion-Bonded Epoxy (FBE) coating on both internal and external surfaces (Fire Red RAL 3000) matching AWWA C550. [1, 2, 3]
📜 Standards & Approvals
- Fire Safety Certifications: Dual certified UL Listed and FM Approved
- Design Standards: Strictly complies with AWWA C508 standards for swing check valves
- Pressure Conformance: Fully conforms to performance metrics under UL 312 and FM Class 1210
- Potable Water Safety: Certified lead-free configurations meeting NSF/ANSI 61 and NSF/ANSI 372 rules
- Flow Orientation: Highly versatile; optimized for either horizontal or vertical lines (with flow direction pointing upward)
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