S.H PPH Socket Fusion Van Stone Flange with Gasket | PP S5 1.25MPa Chemical-Grade Loose Flange Joint (20mm - 225mm)

Xieyu S.H Premium PPH Socket Fusion Van Stone Flanges with Gasket (S5 / 1.25MPa)

Connect, route, and easily align your chemical, industrial, and fluid-treatment pipelines to metal pumps, valves, and heavy equipment with our premium Xieyu S.H PPH socket fusion Van Stone flanges, available at Atradesen.com. Manufactured by Xieyu (S.H / HIEH), a global leader in high-performance thermoplastic flow control, these heavy-duty PPH (Polypropylene Homopolymer) loose flanges are engineered to withstand continuous operating pressures up to 1.25 MPa (181 PSI) and temperatures from -20°C to 100°C.

Featuring an innovative two-piece free-floating backing ring design, this Van Stone flange series is highly compatible with industrial chemical pipelines, acid pickling loops, electroplating lines, waste gas scrubbers, waste acid recovery, and wastewater treatment.

360-Degree Free-Floating Backing Ring for Perfect Bolt-Hole Alignment

Standard integrated flanges feature fixed bolt holes. If you hot-melt weld them slightly out of alignment with the receiving valve, you must cut the pipeline to fix it. Our specialized Van Stone (Loose) Flange resolves this major installation headache. It consists of a PPH socket sleeve (stub end) that heat-welds directly onto standard pipes, and a separate, independent outer flange backing ring. Because this backing ring can rotate 360 degrees freely around the sleeve, you can easily align the bolt holes to any receiving flange face during final assembly, securing a stress-free, rapid installation.

High-Integrity PPH Material Qualities & Sealing Gasket Included

• Chemical & Corrosion Resistance: Molded from high-purity Homopolymer Polypropylene, these S5-rated fittings offer superior chemical resistance to highly corrosive media, organic solvents, strong alkalis, and mineral acids.
• Complete Sealing Gasket Included: Every flange package comes pre-packed with a matching high-density, flat rubber gasket washer. When compressed uniformly during bolt-tightening, it seals microscopic flange face gaps to ensure a watertight, leak-proof mechanical joint.
• Easy Molecular Fusion: The smooth, precision-machined internal socket ends are designed for hot-melt socket fusion welding, forming a unified, leak-proof molecular system.

⚠️ Sizing & Socket Fusion Guidelines

Nominal pipe dimensions are based on standard outer diameters. Please measure your pipe outer diameter (OD) before placing your order:

• Flange Socket Inner Diameter (ID): The designated nominal size corresponds directly to the outer diameter (OD) of your pipe: 20mm (DN15), 25mm (DN20), 32mm (DN25), 40mm (DN32), 50mm (DN40), 63mm (DN50), 75mm (DN65), 90mm (DN80), 110mm (DN100), 140mm (DN125), 160mm (DN150), and 225mm (DN200).
• Connection Methods: Requires standard hot-melt socket fusion welding using professional heating equipment to melt the joints together, securing a completely seamless, leak-proof molecular system. Alternatively, they can be welded using PPH plastic welding rods.
• Note: Standard flanged Van Stone loose-type or bolt-face installation. Connection bolts must be prepared separately.

Technical Specifications

Frequently Asked Questions (FAQ)

Q: What is a "Van Stone" flange, and why is it preferred over standard fixed flanges?

A: A Van Stone flange (or loose flange) consists of two separate components: a flange hub welded onto the pipe and a loose backing ring. The rotating ring allows you to spin the flange face freely to align the bolt holes perfectly with receiving valves or pumps, saving substantial installation time and preventing axial twisting stress on the pipeline.

Q: Can this loose flange system withstand highly acidic environments?

A: Yes. PPH Homopolymer offers superior crystalline density, making it exceptionally resistant to pickling acids, waste acids, alkaline wash solutions, and high-purity industrial effluents up to 100°C. It is widely preferred over PVC in tough industrial environments.