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ProductsThe manufacturer provides supporting services and offers you a one-stop procurement platform for fire accessories and products
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About usAn industrial and trade fire company integrating the development, production, sales, and service of fire accessories.
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09
2025
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12
Essential Guide to UL/FM Certified Grooved NRS Gate Valves
I. Core Advantages: Three-dimensional Breakthroughs for Industry Pain Points
The UL-certified grooved end resilient seated NRS gate valve is engineered for fire protection systems, industrial fluid transmission, and municipal water supply & drainage. It addresses traditional valve drawbacks (high leakage, lengthy installation, costly maintenance) with three core strengths:
1. Resilient Seat Sealing: Zero-leakage Safety Guarantee
Dual wear-resistant EPDM/NBR seats form a full-wrap surface seal with ductile iron gate plates, achieving ≤1.6MPa (PN16) sealing pressure and ≥99.8% zero leakage rate. Compatible with clean water, fire water, and mild acid-alkaline fluids (-10℃~120℃), it eliminates pressure loss from leakage even in long-term fire system operation (1.2MPa working pressure).
2. NRS Design: Compact & Durable
Fully built-in stem avoids impurity intrusion, extending service life by 30% (5,000+ consecutive cycles without failure). Saves 50% installation space, ideal for narrow areas (pipe shafts, equipment-dense sites) without sacrificing operational flexibility.
3. Grooved Connection: Efficient Installation & Maintenance
ANSI B16.104-compliant grooved design replaces welding/flange fastening, cutting installation time from 40 mins to 15 mins (60% efficiency boost). Maintenance requires no pipe cutting—simply remove couplings to replace parts, reducing costs by 40%.
4. UL/FM Dual Certification: Mandatory Scenario Compliance
Meets UL 1091, FM 1120/1131 standards with 1-hour fire rating, ensuring pass for fire sprinkler/hydrant system acceptance. Saves 30%+ approval time vs non-certified valves.
II. Key Technical Specifications
- Nominal Diameter: DN50~DN300 (1.5”~12”)
- Nominal Pressure: PN10 (1.0MPa)/PN16 (1.6MPa) – PN16 preferred for fire/high-pressure industrial use
- Body/Gate Plate: Ductile iron (GGG40/EN-GJS-400-15) + resilient coating
- Operation: Manual (handwheel)/electric (optional for DN≥200)
- Certifications: UL 1091, FM 1120/1131, ISO 9001
- Compatible Media: Clean water, fire water, mild acid-alkaline fluids, industrial circulating water
III. Selection Guide: Scenarios & Pitfall Avoidance
1. Scenario-specific Recommendations
- Fire Protection: UL/FM-certified PN16 models + grooved flexible joints (vibration absorption)
- Industrial Circulating Water: EPDM seats (for >80℃) + electric operation (DN≥200)
- Municipal Water: Thickened gate plates + upstream Y-type filters (≤2mm filtration)
2. Critical Selection Tips
- Match Pressure: PN16 required for fire systems (PN10 risks cracking under test pressure)
- Seat Material: EPDM for high temp (>80℃), NBR for oily media
- Reserve Space: Handwheel needs ≥1.5x valve diameter operation radius (e.g., 150mm for DN100)
IV. Installation & Maintenance Essentials
1. Installation Steps
- Groove Precision: ≤±0.1mm depth/width deviation (use dedicated grooving machines)
- Correct Direction: Align with medium flow arrow (reverse installation causes seal failure)
- Pressure Test: 1.5x nominal pressure for 30 mins (no leakage allowed)
2. Low-cost Maintenance
- Semi-annual Inspections: Grease stem (lithium-based) to prevent jamming
- Impurity Filtration: Mandatory Y-type filter for impure media
- Spare Parts: Reserve 10% resilient seats (replace in 30 mins, 70% cost saving vs full valve replacement)
V. Competitor Comparison
- vs Flanged Valves: 60% faster installation, space-saving; limit to ≤1.6MPa (flanged up to PN25)
- vs Threaded Valves: Larger DN (up to 300 vs 100), better sealing (≤0.2% vs ≥0.5% leakage)
- vs Non-certified Valves: Fire scenario compliance + 200% lower replacement cost, superior fire resistance/sealing
UL Grooved End Resilient Seated NRS Gate Valve
ADDRESS
Lidong Industrial Zone, Meilin Street, Nan'an, Quanzhou City.
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EMAIL ID
sales@sfxf-china.com
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we mainly have: water system accessories, stainless steel fire boxes and foam fire hydrant box accessories, valve accessories, intelligent above-ground hydrants and intelligent end-of-line test devices and automatic fire cannons, as well as accessories and fire equipment and valve product OEM processing.