The Graco 109479 Straight Spring Pin is a durable OEM replacement part for maintaining proper alignment in Graco sprayer assemblies.
The Graco 109479 Straight Spring Pin is a critical micro-component designed for seamless integration into proprietary fluid delivery systems, particularly in industrial airless sprayer assemblies used for professional coatings. Manufactured from high-strength stainless steel alloys, this straight spring pin measures 3/32 inch in diameter and 3/8 inch (9.5 mm) in length, providing exacting tolerances that optimize valve alignment and enhance pump efficiency. Its slender profile and precision-machined end chamfers ensure minimal flow disruption in high-pressure filtration applications, while promoting consistent seal longevity under cyclic load conditions.
In retrofit and maintenance scenarios, the 109479 Straight Spring Pin secures valve stems, piston guides, and manifold linkages in high-demand pump modules. It is employed in the needle valve assembly of the graco 490 paint sprayer, where its spring-loaded resiliency maintains consistent preload against seals, reducing pulsation and ensuring uniform atomization of professional-grade coatings. Additionally, the pin’s corrosion-resistant properties align with rigorous fluid compatibility requirements for water-based and solvent-borne formulations, making it indispensable for contractors seeking to maximize uptime in large-scale finishing operations.
Precision-engineered under CNC-controlled parameters, the straight spring pin features a helical spring tension profile achieved through cold forming techniques that induce optimal residual stress distribution. The dual chamfered ends facilitate automated insertion into retaining bores, while the uniform wall thickness guarantees predictable deflection characteristics under axial compressive loads. Analytical modeling for dynamic loading confirms that the component cycles reliably beyond one million actuations, maintaining pump efficiency through minimal fatigue degradation and consistent sealing force distribution.
Constructed from martensitic stainless steel (UNS S17400 equivalent), the pin exhibits a Rockwell hardness rating of C38–C42 after age-hardening, delivering superior resistance to wear and galling in high-pressure filtration environments. Chemical passivation creates a chromium-rich oxide layer that enhances corrosion resistance, extending seal longevity and minimizing particulate generation within the fluid stream. Rigorous metallurgical testing, including tensile strength assessments and microstructural analyses, ensures compliance with ISO 9001 quality management protocols.
Field technicians often include this spring pin in the graco pump repair kit for scheduled maintenance intervals, as it plays a pivotal role in stabilizing reciprocating assemblies and preventing premature seal abrasion. Regular inspection under borescope evaluation can detect early signs of deformation or surface pitting, enabling preemptive replacement to sustain optimal performance. When correctly installed with recommended torque values for retaining fasteners, the pin contributes to stable pressure regulation, reduced downtime, and extended service life of airless sprayer pumps handling a variety of sealants and coatings.
The Graco 109479 Straight Spring Pin exemplifies advanced component design tailored for high-pressure spray technology. Its precise dimensions, robust material properties, and engineered spring resilience make it an essential part for maintaining the reliability and performance of modern airless sprayer platforms. Whether serving as a backup during preventive maintenance or as an upgrade component in new system builds, this pin ensures consistent fluid control, maximizes pump efficiency, and underpins the durability required in professional coatings applications.
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