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4 Inch (NPS 4") Flexible Grooved Coupling - Ductile Iron, UL/FM Certified for 4.5" OD Fire Sprinkler Pipes (Wet/Dry Systems), Moderate Pressure 2.5Mpa/360 PSI (DN100(NPS 4"))
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4 Inch (NPS 4") Flexible Grooved Coupling - Ductile Features
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〖UL/FM-Certified Fire Safety〗 Dual-certified to UL 213 & FM 1680 standards for wet/dry/preaction sprinkler systems Meets NFPA 13/22 requirements with 2.5MPa (360 PSI) rated working pressure
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〖Precision Flexible Jointing〗 Maximum allowable joint deflection angle: 1.7°. Maximum allowable joint deflection: 29 mm. Pipe max distance : 2.5 mm
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〖Ductile Iron Durability〗 Corrosion resistance – ideal for outdoor pump rooms and harsh environments
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〖60% Faster Installation〗 Roll-groove compatible for NPS 2" (2.375" OD) pipes. Eliminates welding – saves labor costs vs. traditional flange methods
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〖Lifetime Cost Savings〗 45% lower maintenance costs than welded joints over 25+ year service life Includes 5-year manufacturer warranty against material defects
About 4 Inch (NPS 4") Flexible Grooved Coupling - Ductile
This kind of coupling is designed for pipes bearing moderate pressure. It allows controlled angular, linear, and rotational movement at each joint and provides the added advantages of expansion, contraction, and deflection. This is useful to accommodate uneven laying surfaces, and movement from thermal changes, settling, seismic effects, or other causes. Flexible couplings can be used in fire protection systems, feedwater, natural gas systems, etc.
