Welded Diaphragm Seals with Flange Connection

For heavy-duty piping systems where threaded connections aren’t practical, our welded flanged diaphragm seals provide an exceptionally secure, leak-tight solution. By welding the diaphragm directly to a robust flange assembly, this design eliminates potential leak paths, making it the premier choice for isolating sensitive pressure instruments from the aggressive, toxic, or high-viscosity media common in petrochemical refining and pharmaceutical manufacturing.

Seamless Integration & Enhanced Media Resistance

We offer a comprehensive range of flange sizes and configurations to match your existing plant architecture precisely, eliminating the need for costly pipework modifications:

• Standard Sizing & Ratings: Supplied as standard in sizes from 1/2″ to 2″ across Class 150lb and Class 300lb configurations, with alternative international standards (such as PN/DIN) manufactured to special order.
• Foundation Materials: The seal face and protective diaphragm are precision-machined from high-grade AISI 316L stainless steel for superb, all-round chemical resistance.
• Advanced Linings & Coatings: For highly destructive or ultra-acidic process fluids, the flange faces can be supplied with specialised chemical-resistant linings or exotic alloy coatings to dramatically extend instrument lifespans.

Core System Specifications

• Instrument Interface: Fitted with a standard 1/2″ BSP instrument connection to accept your pressure gauges, switches, or digital transmitters.
• Process-Safe Fill: Pre-filled with FDA-approved non-toxic glycerine as standard, ensuring strict compliance and zero contamination risks in sterile process environments.
• Pressure Thresholds: The operating pressure range is entirely dependent on your specified flange size and class rating.

Custom Configurations & Upgrades

• Remote Capillary Line: For routing the pressure indicator away from extreme process heat or intense pipework vibration to a safe, easily accessible viewing station.
• Diaphragm Extensions: Available with extended diaphragms for tank walls or lagged pipelines where the measurement face must sit flush with the internal vessel wall.
• Flush Diaphragm Upgrade: A seamless, dead-space-free profile engineered specifically to meet the rigid requirements of hygienic and sanitary applications.

Are you managing a plant upgrade or an urgent maintenance shutdown? Our technical sales engineers provide rapid configuration advice, highly competitive pricing, and fast UK delivery.