Overview
The Ductile Iron Wide Range Coupling, also known as a Universal Wide Tolerance Coupling, is designed to connect plain-ended pipes with different outside diameters or pipe materials in water supply, irrigation, fire protection, and general utility pipeline systems.
The coupling consists of a ductile iron center sleeve, two end rings, EPDM sealing gaskets, and longitudinal bolts. When the bolts are tightened, the end rings compress the rubber gaskets around the pipe surfaces, forming a secure and flexible pressure seal without welding, threading, or flanging the pipe ends.
Its wide outside-diameter tolerance allows one coupling size to accommodate several pipe materials and external diameters within the specified range. It can be used with ductile iron, grey iron, steel, PVC-U, PE, and fibre-cement pipes, subject to the selected coupling range and pipe suitability. Where two pipe ends have significantly different outside diameters, a stepped coupling configuration can be provided.
Product Advantages
● Reduces the need to stock numerous conventional coupling sizes
● Simplifies repair and connection of pipes with varying outside diameters
● Suitable for new construction, pipeline maintenance, and emergency repair
● Allows limited flexibility compared with rigid flanged or welded joints
● Minimizes pipe-end preparation and installation time
● Can connect pipes made from different materials
● Removable and reusable when the components remain within acceptable condition
● Provides an economical solution for water and utility pipelines
Technical Specifications
Typical Size Range
● DN40–DN600
Larger sizes and special outside-diameter ranges can be discussed with the factory.
Typical Pressure Rating
● PN10 / PN16
The allowable working pressure may be limited by the connected pipe material, pipe condition, outside diameter, wall thickness, installation method, and actual operating temperature.
Material Options
● Center Sleeve: Ductile iron
● End Rings: Ductile iron
● Gaskets: EPDM
● Bolts and Nuts: Galvanized steel / Stainless steel upon request
● Coating: Fusion-bonded epoxy or other approved protective coating
NBR gaskets and other special material configurations may be available for compatible media upon request.
Standards
● Product Reference Standard: EN 14525
● Rubber Gasket Material: EN 681-1
● Epoxy Coating: EN 14901-1, where specified
The applicable standard, coating thickness, gasket approval, bolt material, pressure rating, and outside-diameter range should be confirmed according to the project specification.
Industry Applications
● Municipal water supply and distribution
● Drinking-water pipelines with approved materials and coatings
● Water treatment plants
● Irrigation systems
● Fire protection water pipelines
● Industrial water systems
● Pipeline repair and replacement
● Connection of pipes made from different materials
● Above-ground and underground water pipelines
This product is primarily intended for water-service pipelines. Suitability for wastewater, gas, oil, chemicals, high temperatures, vacuum conditions, or restrained pipeline systems must be separately confirmed.
Installation Notes
● Confirm that both pipe outside diameters fall within the coupling’s specified working range.
● Clean the pipe surfaces and remove dirt, scale, sharp edges, and excessive coating buildup from the sealing area.
● Center the coupling correctly over the pipe ends and maintain the required insertion depth.
● Tighten the bolts gradually and evenly in a cross pattern to the specified torque.
● Do not use the coupling as a substitute for pipeline anchoring where axial thrust restraint is required.
● Pressure-test the completed joint in accordance with the project requirements before commissioning.
Tianjin Dingliu valve Industry Co., Ltd. is a high-tech enterprise specializing in the valve and automation industry.
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