Graco 117387 U-Cup Packing

Compatible Machines for Graco 117387 U-Cup Packing

Graco 117387 U-Cup Packing Overview

The Graco 117387 Packing, U-Cup is a high-performance polyurethane seal designed for airless sprayer pump assemblies. Engineered for precision and durability, it ensures consistent fluid delivery, reduces wear, and simplifies maintenance even in demanding industrial and commercial environments.

Key Features

• Premium polyurethane material with anti-extrusion backup ring
• Quick installation to minimize downtime
• OEM-quality durability for professional spray systems
• Maintains leak-free operation under high-pressure conditions

Design & Material Composition

Precision-engineered U-Cup geometry with dual-lip sealing surfaces actively engages the piston rod to prevent fluid migration. Manufactured with ultra-fine tolerance (±0.001 mm) and low-friction fillers, the seal reduces wear, improves pump efficiency, and extends service intervals.

Performance Metrics

• Leakage rate below 0.01% under static conditions at 5000 psi
• Dynamic leakage under 0.05 ml/min after 1 million cycles
• Tensile strength: 32 MPa, Shore A hardness: 90
• Operational temperature range: -40 °C to 120 °C

Installation & Maintenance

• Remove pump end cap and clean piston rod before installation
• Apply compatible grease to prevent abrasion
• Inspect U-Cup lips after every 800–1,200 hours of use
• Replace seals in matched sets to maintain calibration

Engineering Applications

Widely used in automotive OEM spray booths, marine corrosion protection, architectural finishing, and high-pressure dosing pumps. Supports solvent-borne, waterborne, and UV-curable coatings while reducing bypass pathways and ensuring stable metering accuracy.

Frequently Asked Questions