Comprehensive industrial pipeline infrastructure engineered to international and national standards.
Flanges, Backing Rings, Gaskets & Bolts
Backing Rings for PE Stub Ends
2 products
Gaskets & Flange Bolts
1 products
Interface Role in Connecting PE Pipelines to Flanged Valves
In municipal water and industrial pipelines, flow control and isolation valves typically feature cast-iron flanged connections. Connecting polyethylene pipelines to this equipment requires a polymer stub end paired with a metallic backing ring.
The metallic backing ring sits behind the polyethylene stub shoulder, distributing bolt clamping forces uniformly to achieve tight sealing while preventing polymer creep or flange face distortion.
Standards & Metallurgy of Flange Backing Rings
Backing rings in this category are manufactured in compliance with European standards: EN 1092-1 for structural carbon steel (with hot-dip galvanizing or protective epoxy coatings) and EN 1092-2 for high-strength ductile iron.
Bolt hole patterns and inner seating radii conform strictly to standard industrial flange dimensions, ensuring torque transmission without localized angular binding.
Installation Guidelines & Bolt Torque Management
During assembly, using dimensionally matched sealing gaskets and tightening bolts in a balanced crisscross pattern are essential. Over-torquing beyond recommended limits may cause deformation to the polymer stub or stress the ring.
Protective coatings on steel and ductile rings guard against corrosion within damp valve chambers and buried underground soil environments.
Flanges, Backing Rings, Gaskets & Bolts — Frequently Asked Questions
What is the function of a backing ring in polyethylene pipe joints?
The backing ring fits behind the shoulder of a PE stub end to distribute bolt tensile loads evenly against the mating flange, such as a cast-iron valve.
Which standards govern the backing rings in this catalog?
Steel backing rings are manufactured per EN 1092-1, and ductile iron backing rings conform to EN 1092-2.
Which products are currently published under this category?
Currently, the backing rings for PE stub ends subcategory (galvanized/epoxy steel and ductile iron backing rings) is active in this section.
Can't find what you need?
If you require specific sizes, custom fittings or specifications not listed in the catalog, our technical team is ready to assist and review custom requests.