Bolted Diaphragm Seals with Flange Connection

Our bolted flanged diaphragm seals combine heavy-duty flanged pipework integration with ultimate material versatility. By utilising a multi-part, bolted body configuration rather than a permanent weld, these seals allow for easy customisation of the wetted parts with specialised alloys or protective linings. This makes them an exceptional, cost-effective solution for isolating pressure gauges, switches, and transmitters from highly corrosive, toxic, or volatile process chemicals.

Unmatched Material & Sizing Flexibility

Engineered to drop directly into your existing plant architecture without the need for complex modifications, these units offer an expansive specification footprint:

• Standard Sizing & Class: Supplied as standard in sizes from 1/2″ to 2″ across Class 150lb and Class 300lb ratings (alternative international standards are available to special order).
• Base Specifications: The seal assembly and internal diaphragm are precision-machined from high-grade AISI 316L stainless steel as standard for excellent baseline corrosion resistance.
• Specialist Coatings & Linings: For aggressive, ultra-acidic, or reactive fluids, the flange can be supplied with advanced chemical-resistant linings or exotic alloy coatings, providing maximum medium resistance.

Core Engineering Details

• Instrument Connection: Features a standard 1/2″ BSP entry to seamlessly accept your pressure instrumentation.
• FDA-Approved Fill Fluid: Pre-filled with non-toxic, FDA-approved glycerine as standard, ensuring total process safety and zero contamination risks in sanitary or pharmaceutical lines.
• Pressure Capabilities: The normal operating range is entirely governed by your chosen flange size and class rating.

Available Custom Options

• Remote Capillary Line: For routing the pressure display away from extreme process temperatures or high-vibration pipework to a safe, centralised control panel.
• Diaphragm Extensions: Designed for tank walls or heavily lagged pipelines where the sensor face must extend through to sit flush with the internal vessel wall.
• Hygienic Flush Diaphragm: A smooth, pocket-free diaphragm design configured specifically to prevent media buildup in sanitary applications.

Do you need a custom flange rating or an exotic alloy configuration for an upcoming plant turnaround? Contact our experienced UK technical sales team today for fast delivery options and highly competitive, direct-to-manufacturer pricing.