METAL BELLOW MECHANICAL SEAL

Engineered for Precision. Built for Extreme Conditions.

Overview

Metal Bellow Mechanical Seals are designed for high-temperature, high-pressure, and aggressive fluid applications where traditional seals fail. These seals eliminate the need for secondary elastomeric seals, making them ideal for critical duties in chemical, petrochemical, refinery, and thermal fluid systems.

Key Features

Elastomer-free design – perfect for high-temp & chemically aggressive media
Welded or formed metal bellows – ensure consistent axial movement
Pressure-balanced design for enhanced performance
Handles thermal expansion effectively
Non-clogging, self-cleaning construction
Long service life in extreme environments

Material Specifications

Component & Material Options

Bellows Element: Inconel 718, Hastelloy C, AM350, SS316L
Rotary Face: Carbon, Silicon Carbide, Tungsten Carbide
Stationary Face: Ceramic, SiC, Tungsten Carbide
Gasket (if any): Graphite, PTFE (only if required)
Hardware: SS316, Duplex, Super Duplex, Hastelloy C

Selection of materials depends on application pressure, temperature, and media.

Technical Specifications

Shaft Diameter Range: 18 mm to 150 mm (custom sizes available)
Pressure Range: Up to 40 bar (higher ratings on request)
Temperature Range: -50°C to +400°C
Speed: Up to 25 m/s
Design Type: Single, Double, Tandem configurations available
Rotation: Bi-directional

Applications

Thermal oil circulation systems
Petroleum refineries & hydrocarbon pumps
Chemical reactors and transfer pumps
Marine engine cooling systems
Power plant feedwater & steam systems
High vacuum & cryogenic systems (special design)

Frequently Asked Questions (FAQs)

Q: Why use metal bellows instead of traditional spring seals?
A: Metal bellows seals eliminate elastomers, offering greater reliability in extreme heat, vacuum, and chemical applications.

Q: Are they suitable for abrasive or slurry media?
A: Not recommended unless used with special face combinations and a flushing system.

Q: Can these seals be refurbished?
A: Yes, depending on wear and condition. FloFit offers reconditioning services as well.