Graco 164739 Compression Spring

Graco 164739 Compression Spring: High-Precision Performance for Industrial Spray Systems

The Graco 164739 compression spring is an essential component in advanced paint dispensing devices, engineered to deliver precise mechanical feedback and sustained pressure in high-cycle applications. Designed for integration within drive assemblies of manual and automated systems, this coil spring maintains consistent preload, ensuring repeatable valve actuation and extending service intervals. Manufactured to ISO 9001 quality standards, it supports stringent performance criteria across a wide temperature range while resisting mechanical wear and dimensional drift. Ideal for use in high-capacity coating rigs and portable units, it optimizes flow regulation and dynamic response, significantly enhancing operational accuracy and the longevity of your airless sprayer.

• Material: High-carbon stainless spring steel offering superior tensile strength and fatigue resistance.
• Manufacturing: Precision coiling and shot-peening post-treatment for uniform stress distribution.
• Compliance: Tested per ASTM A313 protocols with documented load-deflection curves for traceable quality assurance.

Constructed from cryogenically treated and passivated stainless steel, the Graco 164739 features a tailored coil density and wire gauge to deliver a nominal spring rate of 0.5 lb/in, adjustable per customer specification. The free length of 0.75 in compresses to a solid height of 0.35 in under a maximum load of 10 lbf, providing a robust safety factor that mitigates coil friction or buckling. Its corrosion-resistant finish extends operational life in abrasive environments and supports consistent dosing cycles, especially when working with challenging formulations and professional coatings that demand unwavering performance.

Design Details and Engineering Metrics

Key geometric parameters include a 0.035 in wire diameter, 18 active coils, and a 0.15 in coil pitch, yielding precise force-deflection characteristics. Finite element analysis confirms that maximum shear stress remains below 45 ksi at full compression, ensuring reliable fatigue life over 10⁶ cycles. Surface roughness is controlled to Ra 0.8 μin via electrochemical polishing, reducing microcrack initiation sites. Custom end configurations, such as squared and ground or unfinished ends, enable seamless installation in poppet valve housings. These metrics directly influence pump efficiency and contribute to consistent seal longevity under dynamic loading and cyclical temperature shifts.

Performance and Application Insights

In high-pressure filtration systems and spray circuits, the 164739 spring modulates spool and piston positions to stabilize outlet pressure within ±2 psi, reducing pulsation and overspray. Its rapid response under low hysteresis conditions improves control loop bandwidth, translating to more accurate coating thicknesses and fewer defects. When used in tandem with diaphragm pumps or piston-driven fluid sections, the spring’s resilience enhances pump efficiency by minimizing energy loss during valve cycling. Field data demonstrates up to a 15% reduction in maintenance intervals and a 20% increase in mean time between failures, directly attributing gains to optimized compression dynamics.

Usage and Maintenance Recommendations

For peak performance, inspect the spring for signs of surface wear or corrosion at each service interval, especially when exposed to harsh solvents or abrasive particulates. Apply a thin film of compatible PTFE-based lubricant to sliding contact surfaces to maintain smooth actuation and preserve seal integrity. Ensure correct axial alignment within the gun body or pump block to prevent lateral bending and premature fatigue. Replace springs in matched sets to retain uniform preload across multi-gun or multi-pump arrays. Proper handling and storage in desiccated environments will safeguard material properties and extend operational life in demanding industrial environments.