The Graco 15C997 Backup Washer delivers unmatched durability and precision for demanding coating applications. Designed to support continuous operation in airless sprayers, this backup washer ensures consistent seal performance under extreme pressure. Crafted from premium-grade stainless steel, it resists wear and corrosion across a broad range of solvents and coatings. Ideal for professional coatings, it enhances pump longevity and maintains optimal flow rates, making it the perfect companion for high-performance spray systems.
Enhanced with a robust piston valve design and precision slot geometry, the 15C997 achieves superior high-pressure filtration, preventing particulate intrusion and reducing downtime. Each component undergoes rigorous testing to guarantee compatibility with a variety of pump assemblies and coating viscosities. Easy to install and service, this backup washer minimizes maintenance intervals and extends overall equipment life. Whether you’re applying large industrial coatings or specialized finishes, the 15C997 Backup Washer provides reliable performance and peace of mind.
$6.3The Graco 15C997 Backup Washer is an essential component designed to enhance diaphragm stability in high-pressure piston valve systems. Manufactured from 17-4 PH stainless steel, the washer features a dual-layer elastomer coating engineered to resist abrasive particles and chemical attack. Its concentric sealing faces are machined to a surface finish below 0.8 µm Ra, ensuring leak-free operation under cyclic loads. Technicians integrating this washer into an airless sprayer system will observe improved stroke consistency and reduced pulsation, translating directly into superior spray patterns and extended service intervals.
In applications demanding uniform fluid delivery, the backup washer maintains valve centering at pressures up to 3600 psi. Its PTFE-infused nitrile layer exhibits a dynamic friction coefficient below 0.15, reducing wear on mating surfaces and preserving seal integrity. The washer’s symmetric profile distributes load evenly across the diaphragm chamber, minimizing localized stress concentrations. When processing high-viscosity media such as epoxies and urethanes, the component’s rapid elastomer recovery ensures each cycle completes with minimal hysteresis, which is vital for spray lines applying professional coatings in industrial finishing.
The core substrate of 17-4 PH stainless steel provides a yield strength of over 120 ksi and excellent resistance to chloride-induced corrosion. A second layer of nitrile-butadiene elastomer exhibits Shore A hardness of 75, optimized to seal under fluctuating pressures and temperatures ranging from –20 °C to 80 °C. Chemical compatibility extends across waterborne latex, solvent-based primers, and polyurethane topcoats. Accelerated salt spray testing and immersion in acidic cleaning solutions confirm negligible mass loss over 500 hours, ensuring longevity even in harsh maintenance cycles.
Engineered to support integrated high-pressure filtration architectures, the 15C997 washer features sealing faces that mate precisely with cartridge filters and valve seats. The low-permeability elastomer layer prevents bypass leakage, ensuring that particulates remain trapped in the primary filter media. This arrangement maintains steady flow rates and minimizes pressure drop, critical for large-scale spray rigs. By channeling fluid through defined pathways, it also aids in purging entrapped air, stabilizing pump suction and improving overall pump efficiency in continuous operation.
Each 15C997 washer is inspected via coordinate measuring machines (CMM) to verify dimensional accuracy within 0.0005 inches. Surface roughness is measured using laser profilometry to ensure Ra values below 0.8 µm on sealing interfaces. Components undergo 500,000 reciprocation cycles at 30 spm under 3600 psi, with zero detectable leakage as confirmed by dye-penetrant analysis. Dynamic life tests simulate thermal cycling between –20 °C and 80 °C, validating seal longevity and consistent frictional performance in compliance with ASTM D1894.
In laboratory evaluations, the backup washer contributes to acoustic damping by reducing valve chatter noise by up to 6 dB. Its low mass and balanced geometry cut inertial forces during rapid direction changes, resulting in stable stroke control at up to 500 cycles per minute. This dynamic response enhancement is critical when spraying fine-particle coatings or operating in confined environments where noise and vibration must be minimized. The washer’s ability to maintain uniform preload on the diaphragm also prevents resonance peaks that can shorten component life.
To install the 15C997 washer, depressurize the pump and remove the piston valve housing caps. Inspect guide rods and bores for scoring, then clean and dry all surfaces. Apply a thin film of silicone-based lubrication to the elastomer face to prevent over-stretching during assembly. Torque the housing bolts to 30 ft-lb and verify alignment using a dial indicator at the piston skirt. Routine inspection every 6 months or after 10,000 gallons of throughput will neutralize wear before leakage begins, optimizing maintenance intervals.
While purpose-built for Graco 15C series piston valve pumps, the 15C997 washer can retrofit legacy Graco models with a minor gland depth adapter. Third-party adapters are available to align the sealing surfaces within ±0.005 inches. Its robust design also makes it suitable for competitor pumps sharing similar bore dimensions, enabling OEMs to unify spare parts across multiple brands. This flexibility reduces inventory complexity and supports rapid field replacements without extensive machining or housing modifications.
The Graco 15C997 Backup Washer exemplifies high-precision engineering, combining advanced materials, rigorous quality control, and optimized geometry to deliver unmatched performance in demanding industrial spray applications. By enhancing pump efficiency and extending seal longevity, it minimizes unplanned downtime and ensures consistent fluid delivery for professional contractors and manufacturers. Its integration supports modern airless sprayer systems in automotive, architectural, and heavy-industry environments, reinforcing Graco’s reputation for durable, high-pressure components.
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