The Graco 15G503 Stop Valve for Hydraulic Motor delivers reliable pressure regulation in industrial finishing equipment. Manufactured by Graco to stringent tolerances, this valve safeguards critical components and supports seamless operation under rigorous conditions. Compatible with various pump assemblies, it helps maintain optimal flow rates and prevents system overloading. By integrating this precision-engineered component, professionals can achieve uniform spray patterns and extend equipment life, all while enhancing performance of their airless sprayer.
Engineered for use with advanced coating solutions, the 15G503 Stop Valve supports high-volume output and consistent pressure delivery. Its design optimizes high-pressure filtration processes, ensuring contaminants are excluded for uninterrupted workflow. Ideal for demanding projects, this component helps achieve flawless coverage with minimal overspray and reduced downtime. Built for rigorous cycles, it delivers reliable results through every application. Technicians will appreciate the maintenance and compatibility across a range of spray platforms, ensuring top-tier results in professional coatings applications.
The Graco 15G503 stop valve is engineered for rigorous industrial environments, offering unmatched flow regulation in high-pressure circuits. This component is specifically designed to integrate seamlessly with hydraulic motor assemblies, providing consistent shut-off performance and leak resistance. Featuring a hardened steel poppet and precision-ground spool, the valve delivers rapid response under variable load conditions. Ideal for use in fluid delivery modules, its compact footprint supports retrofits and new system designs where space constraints prevail.
Manufactured using aerospace-grade alloys and high-precision CNC processes, this valve body excels in durability and fatigue resistance. The bore is honed to maintain optimal seal seating, while the poppet incorporates advanced nitrile coatings for enhanced wear characteristics. Designed around ISO 6264 and SAE J1453 port standards, it permits seamless integration into modular manifolds and hydraulic power units. Maintenance intervals are extended through the use of replaceable seats and spring elements, maximizing mean time between repairs.
Performance testing demonstrates pressure ratings up to 3500 psi, with cycle life exceeding two million actuation events under laboratory conditions. The design minimizes turbulence and cavitation, directly improving pump efficiency and reducing fluid aeration during transient operations. Flow coefficients (Cv) are calibrated to match common pump outputs found in continuous-flow airless sprayer systems. In addition, high-pressure filtration compatibility ensures particle ingress remains below critical thresholds, safeguarding downstream components.
Detailed port geometry optimizes valve opening profiles, reducing inrush currents and pressure spikes. The spool assembly features a patented balanced design to mitigate load-sensitive actuation forces. Elastomer seals are formulated for superior seal longevity, resisting extrusion and chemical attack from primers, solvents, and resins used in professional coatings applications. A dual-spring mechanism provides positive return under back-pressure conditions, ensuring fail-safe closure in the event of control signal loss.
• Model Number: Graco 15G503
• Operating Temperature Range: –20 °C to +80 °C
• Maximum Flow Rate: 12 L/min at 2500 psi
• Materials: 17-4 PH stainless steel, nitrile seal elements
• Weight: 0.35 kg (0.77 lb)
In precision spraying equipment, the valve’s responsiveness supports uniform fluid delivery in airless sprayer assemblies, critical for achieving consistent film thickness. The component also finds use in marine and offshore hydraulic drives, where salt spray resistance and long service life are paramount. In industrial automation, it regulates actuators within robotic arms, combinatorial gantries, and high-pressure filtration stations. Its modular format allows OEMs to streamline inventory and reduce system complexity.
Installation requires standard mounting hardware with a 1 in.-14 UNF thread interface. Torque specifications are 30–35 Nm to ensure optimal sealing without overstressing the body. Inline filters should maintain 10 micron or finer filtration upstream to protect the valve’s poppet and seal surfaces. Routine inspections of seal integrity and spring tension every 500 operating hours will preserve performance metrics. Replacement parts kits include poppet, seat, springs, and O-rings for field service convenience.
The Graco 15G503 valve stands as a benchmark for precision fluid control in hydraulic motor circuits. Its combination of robust materials, stringent manufacturing tolerances, and proven flow characteristics make it indispensable for professional coatings, off-shore hydraulics, and automated production lines. Engineers benefit from straightforward installation, documented performance data, and compatibility with standard manifolds. By selecting this component, system architects can optimize pump efficiency, extend seal longevity, and maintain repeatable control in demanding environments.
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