description Chesterton 440 Overview
The Chesterton 440 is a nonmetallic external single mechanical seal produced by A.W. Chesterton for rotating equipment. Chesterton describes the 440 as a component seal for general chemical applications, with a design intended for fluids that can attack standard seal materials and expensive alloy components. It is relevant to pump and process-equipment operators who need a replaceable seal for chemically aggressive service.
help Chesterton 440 FAQ
What is the Chesterton 440 mechanical seal designed for?
The Chesterton 440 is an external, non-metallic single mechanical seal designed for aggressive chemical applications. Its external construction keeps wetted metal parts out of the process fluid.
Is Chesterton 440 intended for water and wastewater pumps?
The 440 is generally associated with corrosive and aggressive chemical service rather than being a general-purpose elastomer bellows seal for water and wastewater. The catalog description appears to confuse it with another Chesterton product.
What pressure can a Chesterton 440 handle?
Published operating data lists the 440 up to about 10 bar gauge, or 150 psig, depending on fluid, temperature, speed, and seal-face combination. The actual limit must be checked against the selected elastomer and operating conditions.
Why does the Chesterton 440 use a non-metallic external design?
The design is intended for fluids that corrode standard metal seal components or require expensive alloys. Chesterton describes the wetted parts as sacrificial and replaceable during a repair program.
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