Flange (Loose Ring), Slip PVC Schedule 80 4" (854-040FT)

Blue Monster 76037 1-Step PVC Cement Clear (32OZ)

The 854-040FT is a 4" Schedule 80 PVC Loose Ring Flange with a Slip socket connection — also known as a Van Stone style flange. Unlike the one-piece solid style flange, the loose ring design is a two-piece assembly consisting of a solvent-cemented stub end and a separate backing ring that rotates freely around the pipe after installation. This rotating ring is the defining advantage of the Van Stone configuration: bolt holes can be aligned to any mating flange without rotating the pipe itself, making installation significantly easier in tight spaces, long runs, or systems where the pipe cannot be turned after assembly.

The slip socket stub end is solvent cemented permanently to the pipe end, forming a pressure-rated bond identical to any other slip-socket fitting. The loose backing ring then slides over the pipe before cementing and is captured behind the stub end flange face once the joint cures — it cannot be removed without cutting the pipe. The flat face of the stub end seats against the mating flange face with a gasket in between, and the loose ring provides the bolt clamping surface to complete the flanged connection.

At 4", the 854-040FT is sized for high-flow industrial and municipal applications where large-diameter PVC is specified for its chemical resistance, light weight, and long service life relative to metal alternatives. Schedule 80 wall thickness ensures the stub end meets the pressure requirements of demanding systems — chemical dosing lines, pump stations, water treatment plant piping, and process skids — where a Schedule 40 fitting would be underspecified. The dark gray PVC compound provides broad resistance to acids, caustics, and industrial chemicals throughout the service life of the assembly.

⚠️ Verify before ordering: The "FT" suffix in part number 854-040FT may denote a specific assembly configuration, material variant, or packaging (e.g., stub end with backing ring included as a set). Confirm with your distributor or the manufacturer's current catalog whether the backing ring is included with this SKU or must be ordered separately.

Specifications:

⚠️ Note: Pressure ratings decrease at elevated temperatures. Use a compatible full-face gasket and torque bolts evenly in a cross pattern to manufacturer specifications. Never over-torque PVC flanges — the stub end face is the sealing surface and is susceptible to cracking under uneven bolt load.

Industries & Applications:

• Water & Wastewater Treatment — Preferred in plant environments where long pipe runs terminate at pump or equipment flanges and bolt hole alignment without pipe rotation is essential for efficient installation
• Chemical Processing — The rotating ring eliminates the need to spin chemically bonded pipe assemblies during bolt-up, reducing installation errors and joint stress in corrosive-service piping systems
• Industrial Process Piping — Used on process skids and modular assemblies where pre-fabricated pipe spools must be bolted to equipment without the ability to rotate the spool for alignment
• Municipal & Utility Infrastructure — Common on pump station wet well piping, valve vaults, and metering runs where corrosion-resistant large-diameter PVC is specified and alignment flexibility is valued
• Irrigation & Agricultural Systems — Connects large-diameter supply mains to pumping equipment and metering stations where field installation conditions make fixed-hole flanges impractical
• Aquaculture & Commercial Pool/Spa — Used in high-flow recirculating system headers where corrosion resistance and ease of equipment disconnection are both priorities