Graco 15A841 Piston Valve

The Graco 15A841 Piston Valve controls fluid flow in high-pressure systems, providing precise sealing and reliable operation in industrial applications.

Precision-engineered piston for accurate fluid control
Durable construction for high-pressure use
Ensures leak-free operation and smooth cycling
Compatible with OEM valve repair kits

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Description

Graco 15A841 Piston Valve – Product Overview

Compatible Systems

System / Model Type	Description
Graco Plural‑Component Proportioning Pumps	High‑pressure two‑component systems requiring a piston valve to manage fluid metering and pressurization
Graco Metering & Valve Blocks	Valve blocks that integrate a piston valve for precision fluid control and sealing integrity
Graco Repair & Service Modules	Replacement assemblies and rebuild kits where the piston valve is a critical wear part

Product Description

The Graco 15A841 Piston Valve is a precision‑engineered internal valve mechanism designed to regulate high‑pressure fluid flow in demanding industrial applications. It serves as the core working element in fluid control assemblies, enabling accurate opening, closing and sealing within valve systems.

Built from high‑strength materials and finished to exacting tolerances, the 15A841 ensures consistent performance in cyclical operation, withstands elevated pressures, and maintains fluid integrity across thousands of cycles. Whether used in a pump system, service module or metering assembly, it delivers reliable, repeatable fluid control under rigorous conditions.

Key Features

Precision‑machined piston and chamber assembly for tight clearances and minimal leakage
Durable construction engineered for high‑pressure systems and frequent cycling
Optimized sealing surfaces to ensure fluid containment under high loads and variable conditions
Direct OEM compatibility to streamline repair and replacement in Graco systems
Supports long service life and easy rebuildability through modular design

Technical Specifications

Part Number	15A841
Component Type	Piston Valve Assembly
Use Case	Controls fluid admission, sealing and release in high‑pressure valve systems
Typical Pressure Rating*	Up to ~7,250 psi (50 MPa) in comparable assemblies
Function	Acts as moving element inside a valve body to regulate, isolate and release fluids
Serviceability	Designed for inclusion in valve repair kits and rebuild procedures

Installation & Maintenance Tips

Always depressurize the system and relieve fluid pressure before removing the valve assembly.
Inspect piston chamber, seals, O‑rings and surrounding housing for any signs of wear, corrosion, scoring or damage before installation.
Apply the manufacturer’s recommended lubricant to the piston and seals where applicable to ensure smooth cycling and proper function.
Follow specified torque settings for mounting hardware to maintain sealing integrity without damaging components.
During rebuilds, replace all internal seals, O‑rings and packings even if not visibly worn, to restore full system reliability.
After installation, cycle the system at low pressure to verify smooth operation and absence of leaks prior to full‑scale use.

Frequently Asked Questions

It serves as the moving piston element inside the valve body, controlling fluid admission, sealing during pressure hold and release during cycle completion.

Replace the 15A841 when you observe recurring leaks, loss of pressure hold, sluggish piston movement, scoring on the piston surface, or during scheduled maintenance intervals for valve assemblies.

Installation is straightforward for qualified personnel as part of a rebuild kit—but care must be taken to align the piston correctly, apply lubrication, and ensure proper sealing to avoid leakage or premature wear.