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Graco 15A840 Valve Cap

The Graco 15A840 Valve Cap secures and seals the valve chamber for reliable fluid control in high-pressure systems.

  • Ensures leak-free operation under high pressure
  • Durable, precision-machined construction
  • Compatible with OEM valve repair kits
  • Supports long-term maintenance and serviceability

$194
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Graco 15A840 Valve Cap – Product Overview

Compatible Systems

System / Model Type Description
Graco Airless Sprayer Pumps High-pressure sprayer units where valve end-caps contribute to fluid containment and flow control
Graco Plural-Component Dispense Systems Dual fluid systems requiring robust end caps to handle chemical and solvent-based coatings
Graco Valve Repair & Service Modules Service kits for valve blocks where the cap is replaced to renew seal integrity and pressure resilience

Product Description

The Graco 15A840 Valve Cap is a precision-engineered end-cap component designed to secure and seal the valve chamber in high-pressure fluid systems. As a critical interface component, it prevents leakage, isolates internal valve elements, and maintains consistent fluid flow dynamics under demanding operational conditions.

Manufactured with high-tolerance machining and robust materials, the 15A840 Valve Cap ensures long-term durability and performance in industrial coating applications. Whether part of routine maintenance or a full valve rebuild, this cap supports system reliability by maintaining tight sealing, resisting corrosion, and facilitating streamlined serviceability.

Key Features

  • High-precision machined body for consistent fit and seal performance
  • Robust construction suitable for repeated cycles at elevated pressures
  • Integrated sealing interface designed to minimize leakage under extreme conditions
  • Direct OEM compatibility for simplified replacement and integration
  • Optimized for long-term service life and reduced maintenance downtime

Technical Specifications

Part Number 15A840
Component Type Valve Cap / End-Cap Assembly
Use Case Seals and supports the valve chamber in high-pressure fluid handling systems
Material Precision-machined metal alloy body with high-performance sealing interface
Function Provides a secure closure to the valve chamber and ensures fluid containment and flow stability
Serviceability Designed for routine replacement during valve rebuilds or fluid system maintenance

Installation & Maintenance Tips

  • Always release all system pressure before removing the existing valve cap to ensure safe disassembly.
  • Inspect the valve housing and surrounding chamber for signs of wear, corrosion or damage before installing the new cap.
  • Use the manufacturer's specified torque settings when tightening the cap to ensure optimal seal compression without overstressing the housing.
  • When performing a valve rebuild, replace all internal seals, O-rings and gaskets in conjunction with the cap to restore full system integrity.
  • After installation, cycle the system under controlled conditions to verify smooth operation and leak-free performance prior to full production use.

Frequently Asked Questions

It closes and seals the valve chamber, ensuring the internal valve mechanism remains contained, fluid-tight, and properly aligned for consistent flow control.

Replace it when you notice leakage around the cap, difficulty maintaining system pressure, visible damage or wear to the threads/sealing surface, or during scheduled valve maintenance.

Installation is straightforward provided you depressurize the system first, ensure the interface is clean, and torque to specification—but proper alignment and cleanliness are important for reliable sealing.

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