Products → Mechanical Seals → Cartridge Seals → 250/250L
250/250L
Compact, Easy-to-Install Dual Seal for General Services
The Chesterton 250 and 250L are dual cartridge seals designed for reliable performance in general-duty applications requiring a barrier or buffer fluid. Their compact, balanced design fits standard ANSI and ISO pumps, making them ideal for plant-wide use. These seals are built with monolithic seal faces and a non-fretting construction for extended life in intermittent or demanding operating conditions.
The 250L version features a single-point clamp ring for faster, more consistent installation. Both models support improved equipment uptime, reduced maintenance, and safer operation in a wide range of process environments.
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Product Features
✔ Economical upgrade from packing and single mechanical seals
✔ Field repairable cartridge design
✔ Increased barrier fluid flow to maximize cooling and reliability
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25 mm to 120 mm (.938 inch to 4.750 inch)
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ISO-3069C, ASME B73.1, ASME B73.2
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250L: Single Screw Clamp Lock Ring
250OS: Oversized Seal Chambers
Technical Data ↓
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CB, TC, SSC
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FKM, EPDM, FEPM, FFKM
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EN 1.4401 (316SS), Other Metallurgies available on request
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EN 2.4819 (Alloy C-276)
Materials ↓
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711 mm (28") Hg Vacuum to 20 bar g (300 psig)
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-30 to 205 °C (-20 to 400 °F)
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20 m/s ( 4000 fpm )
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Seal pressure capabilities are dependent on the fluid sealed, temperature, speed, and seal face combinations. For operation outside the limits and additional materials consult Chesterton Mechanical Seal Engineering.