AquaMatic K526-RF Internal Parts Kit (Plastic) | Part 1070299

The AquaMatic K526-RF Internal Parts Kit (Manufacturer Part Number: 1070299) is a factory-original component reconstruction kit designed specifically for AquaMatic K526 Series 2.5-inch composite body diaphragm valves. This heavy-duty kit is meticulously configured to restore or maintain the moving core assembly of valves operating in a Normally Open (N.O.) configuration.

Constructed from premium engineered Noryl and PVC resins, the K526-RF kit replaces worn, scored, or mineral-encrusted structural components within the internal valve stack. This complete overhaul kit ensures crisp vertical travel, positive seating alignment, and reliable isolation control, keeping your high-flow industrial water management loops working at peak hydraulic efficiency.

Parts Included List

Derived directly from the original manufacturer schematic, this comprehensive structural kit includes the following core components to fully refresh a Normally Open assembly stack: 

• Item 2 – Disc Plate, 526 (Part 1075176 / 526-EK): Precision-moulded Noryl backing plate that rigidly stabilizes the sealing disc against high backpressures.
• Item 4 – Disc Holder (Part 1075197 / 526-RP): Robust PVC seat housing that holds and protects the active sealing element.
• Item 5 – Shaft (Part 43119): High-grade PVC central stem that drives the synchronous movement of the valve mechanism.
• Item 7 – Shaft Guide (Part 1075178): Noryl guide bush engineered to ensure perfectly centered, low-friction linear tracking during valve cycling.
• Item 11 – Lower Diaphragm Plate (Part 43051): Noryl clamp plate that supports the lower profile of the flexible elastomer diaphragm.
• Item 12 – Upper Diaphragm Plate (Part 43050): Noryl cap-side plate engineered to distribute pilot actuation forces uniformly across the top of the diaphragm membrane.

Note: Flexible elastomer items (Item 3 Disc, Item 6 O-Rings, and Item 9 Diaphragm) are subject to fluid compatibility requirements and are sold separately or as part of the K526-RA EPDM Seal Kit (1070275).

Key Features & Benefits

• OEM Precision Engineering: Guaranteed exact dimensional tolerances to match your existing AqMatic / Pentair K526 (2-1/2") commercial control valve.
• Chemical & Corrosion Resistant: Formulated from industrial Noryl and PVC thermoplastics, making the internal assembly highly resilient against deionized water, brine, and aggressive chemical feed sequences.
• Complete Top-to-Bottom Refresh: Replaces all critical moving and guiding components in a single SKU, eliminating the need to source individual structural plastic parts.
• Restores Factory Functionality: Rectifies internal bypass, tracking issues, or sticking valves caused by mineral scale or physical scoring on the old guide surfaces.

Technical Specifications

Applications & Systems

The AquaMatic 2.5-inch series composite valves are widely selected for high-volume commercial and municipal treatment arrays where iron-free and rust-proof liquid containment is required. This internal kit is standard inventory for servicing:

• Multi-vessel industrial water softeners and deep-bed media filter networks.

• High-output commercial reverse osmosis (RO) pre-treatment pipelines.

• Demineralizers and boiler feed make-up lines.

 

Installation Tip: During rebuild assembly, the disc nut and shaft must be adjusted so they sit perfectly flush with one another after components are tightened down to a target torque specification of 20–25 in-lbs (2.3–2.8 Nm). When securing the upper diaphragm plate (Item 12) to the shaft, use the dedicated AquaMatic 526-Z Assembly Tool (Part 1075224) to ensure correct torque seating without slipping or rounding the structural plastics.