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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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07
2026
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04
Flexible Pipe Coupling: The Invisible Emergency Repair Expert for Urban Pipeline Networks
1. What is a Flexible Pipe Coupling?
A flexible pipe coupling (also known as a pipe repair clamp, universal quick connector) is a weld-free sealing pipe fitting specially designed for pipeline connection, emergency repair, and renovation. With a ductile iron main body, a high-elasticity rubber sealing ring, and stainless steel fasteners, it achieves rapid, sealed pipeline connection simply by tightening bolts—no hot work, no melting required. It is a core engineering component for solving pipeline failures and network upgrades.
2. Core Technical Principle: How Does It Achieve "Zero Leakage" Sealing?
Its core advantage stems from the mechanical extrusion sealing structure:
Bidirectional Extrusion Design: The upper and lower flanges apply uniform pressure via bolts, squeezing the internal EPDM rubber ring to wrap 360° around the pipe radially, forming a tight sealing surface that completely blocks water leakage paths.
Flexible Compensation Structure: The high elasticity of the rubber ring adapts to slight pipe ovality, misalignment, and eccentricity, while absorbing displacement caused by thermal expansion/contraction and ground settlement, preventing pipe cracking from hard connection stress.
Pressure Self-Reinforcement Feature: The higher the water pressure inside the pipe, the tighter the rubber ring fits the pipe, resulting in more stable sealing performance—perfectly suited for high-pressure conditions in fire protection and municipal water supply systems.
3. Core Functions and Application Value
3.1. Rapid Emergency Repair, Minimizing Public Impact
For sudden pipeline leaks, it can be installed without shutting off water or with minimal downtime, restoring pipeline operation within 15 minutes. This drastically reduces disruptions to residents' lives and enterprise production, making it an "emergency lifesaver" for municipal repairs.
3.2. Universal Compatibility, Solving Connection Difficulties
Compatible with almost all common pipe materials: cast iron, steel, PVC, PE, ductile iron, concrete pipes, etc.
Supports same-diameter and slight reduced-diameter pipe connections, adapting to complex working conditions such as pipe diameter deviation, installation misalignment, and oval deformation, solving the "connection pain points" of aging pipeline network renovation.
3.3. Vibration and Disturbance Resistance, Extending Pipeline Lifespan
Effectively absorbs vibration and water hammer impact from pipeline operation, as well as axial/radial displacement from ground settlement and temperature changes. This prevents pipe cracking due to stress concentration, extending the overall service life of the pipeline network by over 30%.
3.4. High-Pressure Sealing, Adapting to Harsh Working Conditions
With a rated working pressure of 1.0MPa-2.5MPa, it meets the high-pressure water delivery requirements of municipal water supply, fire sprinkler systems, and industrial water supply and drainage. Its sealing performance far exceeds traditional welding and flange connections, eliminating leakage risks.
4. Core Product Advantages (Engineering-Grade Quality Assurance)
| Advantage Dimension | Technical Highlights |
|---|---|
Main Body Material | Integrally cast high-strength ductile iron, tensile strength ≥420MPa, impact and corrosion resistant. Equipped with epoxy spray anti-corrosion coating, service life underground exceeds 30 years. |
Sealing System | Imported EPDM rubber ring, aging, acid/alkali, and high/low temperature resistant (-30℃~110℃), suitable for drinking water, sewage, fire water, and other media. |
Fasteners | 304 stainless steel bolts/nuts, anti-rust and anti-loosening, with red protective caps for easy identification and operation. No slipping or rusting during long-term use. |
Easy Installation | No professional tools or hot work required, operable by ordinary workers. Construction efficiency increased by 80%, significantly reducing labor costs. |
Compliance Certification | Complies with national/international standards such as GB/T 13927 and ISO 9001, passing pressure tests and hygiene certification, ensuring smooth project acceptance. |
5. Full-Scenario Application Coverage
Municipal Water Supply and Drainage: Emergency repair, renovation, expansion of tap water and sewage pipe networks, repair of aging pipes, connection of different material pipes
Fire Protection Water Supply System: Connection and maintenance of fire sprinkler and hydrant pipes, ensuring stable high-pressure operation of fire water systems
Industrial Pipe Networks: Connection, shock absorption, and emergency repair of factory water supply/drainage, chemical pipelines, and circulating water systems
Building/Community Pipe Networks: Maintenance and renovation of water supply and drainage pipes in residential and commercial complexes, temporary water supply connection
Special Scenarios: Pipeline connection and emergency repair in complex working conditions such as ships, mines, and water conservancy projects
6. Standardized Installation and Operation & Maintenance Guide
Installation Steps
Clean the pipe interface: Remove burrs, rust, and debris from the pipe surface to ensure a smooth surface and avoid scratching the rubber ring
Pre-install and position: Slide the coupling onto both ends of the pipe, adjust pipe coaxiality to ensure the rubber ring fully fits the pipe
Diagonal tightening: Tighten bolts evenly in a diagonal sequence, applying pressure in 2-3 steps to avoid uneven force leading to sealing failure
Pressure test acceptance: Conduct a hydraulic pressure test after installation to confirm no leakage before putting into use
Operation & Maintenance Key Points
Regular inspection: Check bolt tightness quarterly, tighten loose bolts in a timely manner, and inspect for interface leakage
Environmental protection: Apply anti-corrosion wrapping for underground installation to avoid corrosion from acid/alkali soil; avoid direct sunlight for outdoor installation to accelerate rubber aging
Taboos: Do not use beyond rated pressure, do not use for flammable and explosive gas pipelines (except explosion-proof models), and avoid severe impact
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Lidong Industrial Zone, Meilin Street, Nan'an, Quanzhou City.
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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.