20659 AMEREX KP VALVE REBUILD KIT - OEM
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Wholesale PricingThe Amerex 20659 KP Valve Rebuild Kit is a complete OEM maintenance kit for restoring the discharge valve on Amerex KP wet chemical suppression cylinders — specifically the KP 275, KP 375, and KP 475 models. Whether during regular 6-year internal inspection or after a system discharge, the 20659 kit provides every internal component needed to bring the discharge valve back to factory-rated performance. The valve rebuild kit eliminates the need to source individual parts separately, reducing service time and ensuring all replacement components are dimensionally matched OEM parts that maintain the system's UL 300 listing.
The 20659 includes the valve stem, piston, O-rings, downtube assemblies for all three KP cylinder models (275/375/475), retainer nuts, and seals — a complete internal parts replacement that resets the mechanical service life of the discharge valve. In wet chemical systems, the potassium acetate-based agent is highly alkaline and can cause elastomer degradation and metal corrosion in valve components over multi-year service intervals. The 20659 ensures all agent-contact surfaces are refreshed with new, agent-compatible materials at every scheduled internal service event.
For fire protection contractors servicing Amerex kitchen fire suppression system components, the 20659 valve rebuild kit is a mandatory item for any 6-year internal examination of KP 275, 375, or 475 cylinders. Keeping rebuild kits stocked as part of your amerex fire suppression system parts inventory ensures you can complete a full valve overhaul during a single service visit without waiting on component back-orders. The rebuild kit pairs with the 16266 downtube assembly (included), O-ring lubricant, and fresh wet chemical agent to form a complete KP cylinder internal service kit.
| Feature | Details |
|---|---|
| Manufacturer | Amerex Corporation |
| Part Number | 20659 |
| Compatible Cylinders | Amerex KP 275, KP 375, KP 475 |
| Kit Contents | Valve stem, piston, O-rings, downtube assemblies, retainer nuts, seals |
| Agent Compatibility | Wet chemical (potassium acetate based) |
| Service Interval | Required at 6-year internal examination and post-discharge |
| Certifications | UL Listed, OEM Original |
6-Year Internal Examination
NFPA 10 and NFPA 17A require internal examination of wet chemical suppression cylinders at the 6-year service interval. During this examination, the valve must be removed, all internal components inspected, and all soft goods (O-rings, seals, piston) replaced with the contents of the 20659 kit regardless of apparent condition. Reusing compressed or agent-exposed seals after a 6-year service interval is a compliance violation. Document the rebuild on the fire suppression system inspection record and affix a new service label to the cylinder.
Post-Discharge Rebuild
After any system discharge — accidental or in response to a real fire — the KP cylinder valve must be fully rebuilt using the 20659 kit before the cylinder is recharged and returned to service. Discharge forces can deform valve components in ways that are not visible to the naked eye. Installing a new 20659 kit after every discharge resets the valve to factory specification and ensures reliable performance for the next service interval.
O-Ring Lubrication
Before installing new O-rings from the 20659 kit, apply a thin film of silicone-compatible o-ring lubricant to each seal. This prevents tearing during assembly and ensures proper seating. Use only lubricants approved for wet chemical agent compatibility — petroleum-based lubricants can degrade the elastomers and contaminate the potassium acetate agent charge.
Does the 20659 kit include the wet chemical recharge?
No. The 20659 is a valve rebuild kit only — it contains the internal mechanical components for the discharge valve. The wet chemical agent recharge must be ordered separately. For KP 275, 375, and 475 cylinders, order the appropriate Amerex wet chemical recharge to complete the full service. The 16817 6-liter wet chemical recharge is the correct agent charge for the KP 275 model.
Is this kit compatible with KP 600 cylinders?
The 20659 is specifically designed for the KP 275, 375, and 475 valve assembly. The larger KP 600 cylinder uses a different valve configuration that requires its own rebuild kit. Verify the correct kit part number for your specific cylinder model using the Amerex KP system manual or amerex fire suppression system parts catalog before ordering.
Can I use this kit to rebuild a Pyro-Chem KP valve?
No. The 20659 is specifically for Amerex KP valve assemblies. Pyro-Chem wet chemical systems use different valve geometries and agent compatibility specifications. Always use the valve rebuild kit specified by the system manufacturer to maintain the UL 300 listing and wet chemical agent compatibility.
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