Overview
The Chesterton 442 Split Mechanical Seal 3.750 shaft (part 685537) is a premium split mechanical seal designed for industrial pump applications where equipment disassembly is impractical or costly. The flagship product of the world leader in split seal technology, the 442 combines proven performance with straightforward installation.
Key Features
- Ideal for equipment that is difficult and time-consuming to disassemble, such as large pumps, vertical pumps, and horizontal split case pumps
- Compact design allows for easy installation and a fit advantage on most equipment
- Ball-and-socket O-Rings provide a quick and easy seal without the use of adhesives
- Captive screws cannot fall out, making installation straightforward and reliable
- High performance split technology allows the 442 to operate from vacuum to high pressures
- Split, low-cost repair kits reduce ongoing maintenance costs
Technical Specifications
The Chesterton 442 is engineered to meet demanding industrial seal requirements across multiple operating conditions:
- Shaft Sizes: 1.625″ to 4.750″ (40 mm to 120 mm)
- Pressure Range: 711 mm (28″) Hg Vacuum – 30 bar g (450 psig)
- Temperature Range: 120°C (250°F)
- Maximum Speed: 20 m/s (4000 fpm)
- Elastomer Options: FKM, EPDM, FEPM
- Seal Face Materials: CB, RSC, CR
- Metal Construction: EN 1.4401 (316 Stainless Steel)
- Springs: Elgiloy®
- Standards: ISO-3069-S, ASME B73.1, ASME B73.2, NSF61, ACS, ATEX
Typical Applications
The 442 split seal is ideal for equipment that is difficult and time consuming to disassemble such as large pumps, vertical pumps, and horizontal split case pumps. This proven, compact design can be used in a wide variety of equipment and process fluids. Common applications include water and wastewater treatment, brine pumping, hydroelectric turbines, and industrial process water systems.
Compatibility & Replacements
Compatible With
- Large centrifugal pump stuffing boxes (1.625″ to 4.750″ shaft sizes)
- Horizontal split-case pumps
- Vertical turbine pump systems
- Industrial process water pumps
- Fire protection pump systems
- HVAC cooling tower circulation pumps
Replaces / Drop-In Replacement For
The Chesterton 442 is a split seal design and serves as a direct alternative to traditional cartridge seals on compatible equipment. Verify compatibility with your system integrator before ordering, as seal selection depends on stuffing box configuration, shaft diameter, and operating conditions.
Works With
- Standard mechanical seal gland bolting patterns (2, 3, and 4-bolt configurations)
- Elastomer compounds compatible with common pump fluids (water, petroleum, brine, glycol)
- Chesterton 442 split repair kits and spare parts
- Most industrial pump manufacturers’ stuffing box designs
