Metal Bellows Mechanical Seal

Metal Bellows Mechanical Seals are designed for rotating equipment operating under demanding temperature, chemical and process conditions. These seals use a flexible metallic bellows assembly to provide axial movement compensation and maintain sealing face contact as wear and thermal movement occur.

Unlike conventional pusher-type mechanical seals, metal bellows designs generally eliminate the need for a dynamically sliding secondary O-ring along the shaft or sleeve. This helps reduce the risk of seal face hang-up caused by deposits, corrosion or restricted secondary seal movement.

Metal bellows seals are widely used in chemical processing, petroleum refining, power generation and industrial pumping equipment.

Features & Advantages

• Metal Bellows Construction: Flexible metallic elements provide axial compensation and sealing face loading.

• High-Temperature Capability: Selected metal bellows designs are suitable for elevated-temperature process applications.

• Non-Pusher Design: Eliminates the dynamically sliding secondary O-ring used in many conventional spring seals.

• Reduced Seal Face Hang-Up: Helps maintain axial movement in applications where deposits or thermal effects may interfere with sliding components.

• Chemical Compatibility Options: Different bellows alloys and sealing face materials can be selected for specific process fluids.

• Balanced Design Options: Selected profiles offer hydraulic balancing for demanding pressure conditions.

• Multiple Configurations: Available in rotating, stationary, single and selected cartridge designs.

Materials & Construction

Metal bellows mechanical seals commonly incorporate welded or formed metal bellows, sealing faces, stationary seats and secondary sealing components.

Bellows materials may include AM350 stainless steel, Inconel alloys and other corrosion-resistant metallic materials.

Common sealing face combinations include carbon graphite, silicon carbide and tungsten carbide.

Secondary sealing materials may include graphite, PTFE, FKM or other materials depending on the temperature and operating medium.

Typical Applications

• Chemical and petrochemical process pumps

• Oil refining and hydrocarbon processing

• High-temperature industrial pumping systems

• Power generation equipment

• Heat transfer fluid pumps

• Industrial chemical handling equipment

• Selected low-temperature process applications

Standard & Custom Supply

CORA SEALS supplies metal bellows mechanical seals in various shaft dimensions, bellows materials and sealing face configurations for industrial distributors, pump manufacturers and maintenance companies.

Standard and custom designs can be sourced according to pump specifications, existing mechanical seal models, technical drawings or samples.

For quotations, please provide the shaft diameter, seal chamber dimensions, process fluid, temperature, pressure and rotational speed.

For elevated-temperature or chemically aggressive applications, information about bellows alloy requirements, secondary sealing materials and operating conditions is particularly important.