AquaMatic K520-RAJ Seal Kit (Butyl) for 1/2-Inch Diaphragm Valves

Optimize your chemical treatment processes and ensure reliable fluid isolation with the Genuine AquaMatic K520-RAJ Butyl Seal Kit (SKU: 11275000104 / 2001007002). Manufactured by AqMatic (formerly Pentair), this professional-grade maintenance kit is specifically engineered for 1/2-Inch K520 Series Composite Body Diaphragm Valves.

By utilizing premium Butyl (IIR) elastomer, this kit provides specialized chemical compatibility, offering exceptional resistance to polar solvents, ketones (such as acetone and MEK), strong acids, alkalis, and ozone. It is the ideal choice for demanding industrial water treatment applications where standard rubbers or fluorocarbon seals would prematurely degrade.

Key Features & Benefits

• Specialized Butyl (IIR) Elastomer: Engineered for excellent gas impermeability and superior resistance to environmental degradation, polar fluids, and caustic solutions.

• Maintains Pressure Boundaries: Replaces high-wear flexible components to guarantee a drip-tight seat seal and flawless vertical stroke tracking.

• Perfect Manufacturer Fit: Direct factory-spec replacement parts tailored for the 1/2" K520 Y-pattern composite valve, maintaining precise pressure-to-close or pressure-to-open dynamics.

• Minimal Flow Restriction: Fresh, perfectly sized soft components ensure the valve retains its signature low-pressure loss performance.

Comprehensive Kit Parts List

The K520-RAJ Kit includes all the vital, flexible sealing elements required to completely rebuild the upper and lower control fluid chambers:

• 1 x Butyl Sealing Disc (Item No. 3): The main seat insert responsible for stopping line media flow under pressure.

• 1 x Fabric-Reinforced Butyl Diaphragm (Item No. 8): The primary flexible pressure barrier separating the upper cap control chamber from the pipeline. (1078035).

• 4 x Precision Butyl O-Rings (Item No. 6, 7, 9, 15): High-performance static and dynamic O-rings needed to seal the shaft, guide assembly, and body-to-cap mating surfaces.

Technical Specifications

Installation & Compatibility Notes

When tearing down glass-filled composite valves, avoiding mechanical damage to internal plastic components is crucial. Technicians should always utilize the official AquaMatic 520-Z Assembly Tool to hold and align internal shaft configurations safely during disassembly.

Engineering Compatibility Warning: While Butyl is superb for acids and ketones, it has very poor resistance to petroleum-based oils, hydrocarbons, and grease. If your water treatment loop involves hydrocarbons, look toward the K520-RAV Viton Kit instead.