20660 Amerex IS Valve Rebuild Kit - OEM

The Amerex 20660 IS Valve Rebuild Kit is a complete OEM maintenance kit containing all the parts needed to fully rebuild a valve on an Amerex Industrial (IS) dry chemical suppression system cylinder. The IS series protects high-hazard industrial fire environments including paint spray booths, industrial ovens, dip tanks, and other industrial applications where ABC dry chemical agent suppression is required. Like the 20659 KP Valve Rebuild Kit for wet chemical KP cylinders, the 20660 provides a single-kit solution for restoring IS valve integrity to factory specification during 6-year internal examination or post-discharge service.

Amerex IS dry chemical system cylinders operate under nitrogen pressurization and contain ABC dry chemical agent — a combination that subjects valve internal components to both nitrogen gas pressure and the abrasive, hygroscopic properties of dry chemical powder over multi-year service intervals. The 20660 kit uses elastomers and components specifically rated for dry chemical agent compatibility and nitrogen pressure environments, ensuring the rebuilt valve provides reliable discharge performance through the next service cycle.

The 20660 is the IS system counterpart to the KP 20659 rebuild kit — together they cover the two primary Amerex suppression system cylinder types in commercial service. For fire protection contractors managing Amerex IS system installations in industrial environments, keeping the 20660 in your amerex fire suppression system parts inventory ensures 6-year internal examination service can be completed in a single visit. Authorized amerex distributors carry the 20660 as a standard stock item per the amerex fire suppression system parts catalog. The Amerex IS system service documentation provides the complete valve rebuild procedure using 20660 kit components. Document the rebuild in the fire suppression system inspection record and affix a new service label per NFPA 10 and NFPA 17A requirements.

6-Year Internal Examination

NFPA 10 requires internal examination of dry chemical suppression cylinders at the 6-year interval. Depressurize the IS cylinder completely before removing the discharge valve. Clean all residual dry chemical powder from the valve body and cylinder interior before installing the 20660 kit components — packed or caked dry chemical can prevent new seals from seating correctly. Replace all soft goods (O-rings, seals) with 20660 kit contents regardless of apparent condition, then perform a leak test before recharging. Document the rebuild in the fire suppression system inspection record and apply a new service label per NFPA 10 requirements.

Post-Discharge Service

After any Amerex IS system discharge, rebuild the cylinder valve with the 20660 kit before recharging with fresh ABC dry chemical agent. The discharge event subjects valve internal components to forces that can cause deformation not visible externally. Always complete a full 20660 rebuild before returning an IS cylinder to service after any discharge event.

What is the difference between 20660 and 20659?

The 20660 is for Amerex IS industrial dry chemical system cylinders. The 20659 is for Amerex KP wet chemical kitchen suppression cylinders. They are not interchangeable — the wet and dry chemical environments require different elastomer formulations and component specifications. Always use the correct kit for the cylinder type: 20659 for KP wet chemical, 20660 for IS dry chemical.

Is the 20660 compatible with all IS cylinder sizes (IS18, IS35, IS45)?

Verify compatibility with your specific IS cylinder model using the Amerex IS system service documentation or by consulting authorized amerex distributors. The IS18, IS35, and IS45 may use different valve assembly configurations — confirm the correct rebuild kit for your specific IS cylinder model before ordering. The amerex fire suppression system parts catalog provides the complete kit-to-cylinder compatibility matrix.