80Ge Gasket For 8"

This 8" Class 100 PVC Flange Gasket provides a pressure-tight, elastomeric seal at flanged PVC pipe connections in large-bore water distribution, irrigation, water treatment, and industrial process piping systems. Dimensioned to fit standard 8" Class 100 PVC flanges, this full-face gasket spans the entire face of the mating flange — covering both the pipe bore and the full bolt circle pattern — to distribute bolt clamping load evenly across the flange face and deliver a reliable, leak-free seal when the flanged joint is properly assembled and torqued.

The full-face gasket configuration is the correct and required design for PVC flanged connections. Unlike raised-face metallic flange assemblies where a ring gasket seats within the pipe bore area only, PVC flanges require a full-face gasket extending to the bolt holes to prevent uneven stress concentration across the flange face — a condition that can crack PVC flange bodies under bolt load if a ring gasket is substituted. At 8", where the flange face area is substantial and the bolt forces required to seat the gasket adequately are significant, using the correct full-face configuration is particularly critical for both joint integrity and long-term flange body protection.

EPDM (Ethylene Propylene Diene Monomer) is among the most widely specified gasket materials for PVC flange connections in water distribution, irrigation, and general process piping. Its broad compatibility with potable water, chlorinated water, mild acids, bases, and ozone makes it the standard material choice across municipal water systems, commercial irrigation infrastructure, and water treatment process piping where the full-face gasket must maintain resilience and sealing performance through the full service life of the flanged joint. EPDM's excellent compression set resistance allows the gasket to sustain sealing force after initial bolt torque and through repeated thermal cycling — maintaining an effective seal without significant relaxation or loss of performance across the service temperature range.

At 8", flanged connections appear at large-bore pump station discharge headers, primary distribution valve bodies, filter vessel inlet and outlet flanges, major irrigation mainline isolation valves, municipal water main branch connections, and primary process piping tie-in points. The 8" gasket is a consumable component of every flanged assembly at this size — it should be replaced each time a flanged joint is opened to ensure a fresh, uncompressed sealing surface is present when the joint is re-torqued. Reusing a compressed gasket from a previously opened joint risks inadequate sealing pressure at the re-torqued joint and is not recommended practice at this large-bore flange size.

When assembling a flanged joint using this gasket, center the gasket on the flange face with all bolt holes aligned before bringing the opposing flange faces together. Lubricate all flange bolts with an appropriate thread lubricant to achieve accurate torque values, prevent galling on the bolt threads, and ensure consistent clamping force across all bolt positions. Tighten flange bolts in a cross-pattern sequence — working across the flange face in a star pattern rather than in a circular sequence — to apply even compression across the full gasket face from the initial snug-up through each successive torque pass. Bring all bolts to a snug hand-tight condition before beginning the torque sequence; never fully torque individual bolts before the others are engaged. Follow the PVC flange manufacturer's published bolt torque specifications for the applicable bolt size, material, and flange class — over-torquing PVC flanges risks cracking the flange body or extruding the gasket material beyond the bolt holes, while under-torquing produces insufficient gasket compression and joint leakage. Re-check torque values after initial pressurization if required by the manufacturer, as initial compression may cause minor gasket relaxation at large-bore flange assemblies.

Specifications:

Industries & Applications:

• Municipal & Commercial Water Distribution — Seals 8" flanged connections at primary isolation valve bodies, pump station discharge headers, main distribution tee flanges, large meter station connections, and primary service entry flanges in municipal water supply and commercial distribution infrastructure where 8" PVC flanged joints are a standard connection method at mainline isolation and branch positions
• Large-Scale Irrigation & Agriculture — Provides gasket sealing at 8" flanged isolation valves, pump station outlet flanges, primary filter vessel connections, and mainline header flange joints in large-scale agricultural, golf course, and commercial landscape irrigation systems where the 8" mainline carries primary supply volume to multiple submain distribution sectors
• Water & Wastewater Treatment — Seals flanged connections at 8" pump flanges, filter vessel inlet and outlet flanges, clarifier connection flanges, chemical distribution valve flanges, and primary process piping tie-in points in municipal and industrial water treatment and wastewater processing facilities where large-bore flanged joints are the standard connection method at major process equipment interfaces
• Industrial Process Piping — Provides a reliable flanged joint seal on 8" PVC process headers, equipment nozzle flanges, tank outlet flanges, and large-bore distribution valve connections in chemical processing, mining, and industrial water handling systems where the EPDM material provides adequate chemical compatibility with the process fluid at the flanged joint position
• Pump Station & Infrastructure — Seals 8" flanged connections at pump discharge flanges, suction flange joints, pressure main isolation valves, and infrastructure connection points in municipal pump stations, booster stations, and water supply infrastructure where flanged joints are required for regular valve and pump maintenance access and periodic gasket replacement
• Pool, Spa & Aquaculture — Used at 8" flanged connections on large recirculation pump flanges, primary filtration system valve flanges, and primary distribution header connections in large commercial aquatic facilities, municipal pools, and aquaculture systems where the large-bore flanged joint must seal reliably through repeated seasonal assembly and disassembly cycles with consistent gasket replacement
• Fire Protection & Site Utilities — Seals 8" flanged connection points on fire protection water supply mains, hydrant supply header flanges, and site utility water distribution valve flanges in commercial and industrial site development where large-bore flanged PVC connections are specified at primary utility supply isolation and distribution points