Graco 114378 Check Valve

Graco 114378 Check Valve: Overview

The Graco 114378 Check Valve is a genuine OEM one-way valve used in Graco fluid and pump systems to prevent back-flow and maintain correct flow direction and pressure behaviour.

Key Features

• OEM Part: Manufactured by Graco for compatibility and reliability.
• One-Way Flow Design: Ensures fluid or air moves only in the intended direction.
• Pressure Integrity: Helps maintain correct pressure in pump or spray systems by preventing reverse flow.
• Maintenance Friendly: Serves as a reliable replacement part for periodic service or failure of existing valve.

Compatible / Known Applications

While a full list of model numbers is not publicly listed by Graco, this part is used across a variety of Graco pump and spray systems. If your parts diagram lists 114378, the compatibility is confirmed.

• Graco displacement and diaphragm pump systems
• Graco air-driven ram and pump mounting systems (for priming & back-flow prevention)
• Graco industrial coating and spray application equipment where one-way check valves are required

Specification Details

Installation & Maintenance

• Shut down and relieve all system pressure before removal or installation.
• Ensure mating surfaces and threads are clean and free of debris or damage.
• Use appropriate sealant or thread compound if required (as per system manual).
• Inspect the installed valve for leakage or improper flow direction during operation.
• Replace if reverse flow, leakage, or performance issues occur.

Frequently Asked Questions