Graco 220631 Piston Valve

The Graco 220631 Piston Valve is a genuine OEM replacement part that ensures smooth fluid control and consistent spray pressure in your Graco airless sprayer. Ideal for restoring performance and preventing leaks in the pump section.

Part Number: 220631
Category: Fluid Section / Piston Valve
Fits: Ultra 1500, Ultra Plus 1500, Ultimate 1500 Series, GM 5000, GM 10000, LineLazer 5000
Use: Controls paint flow and maintains pressure during pump cycle
Type: OEM Graco replacement – built for reliability and long life

Retail Price: $141.5

You save: $11.74 (8.30%)

Our Price: $129.76

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Description

Compatibility & Details for Graco 220631 Piston Valve

Compatible Machines

Graco Ultra 1500 (Model 220627)
Graco Ultra 1500 (Model 231053)
Graco Ultra Plus 1500 (Model 231811)
Graco Ultimate 1500 Series
Graco Ultimate Plus 1500 Series
Graco GM 5000 Series
Graco GM 10000 (Model 231343)
Graco LineLazer 5000 (Model 231133)

What is the Graco 220631 Piston Valve?

The Graco 220631 Piston Valve is an OEM fluid-section valve used in select Graco airless sprayers. It works with the displacement rod and ball cage to control paint flow, maintain pressure, and prevent backflow during each pump cycle—helping restore proper spray performance when the original valve is worn.

Key Specifications

Part Number	220631
Category	Fluid Section / Piston Valve (OEM replacement)
Function	Controls fluid flow within the pump cycle; seats with ball cage and packings
Common Symptoms When Worn	Pressure loss, pulsation, poor pattern, difficulty priming
Included	Valve assembly (refer to your unit’s parts manual for adjacent items)

Notes & Installation Tips

Verify your exact sprayer model/series against the parts diagram before ordering.
Inspect related wear parts during service: displacement rod, packings, ball cage, and seals.
Use proper torque and lubrication as recommended by Graco; test for leaks and prime fully after reassembly.
For heavy/abrasive coatings, consider routine fluid-section maintenance intervals to extend service life.

Frequently Asked Questions

Check your sprayer’s exact model/series and the fluid-section diagram. If your unit appears in the Compatible Machines list above (e.g., Ultra 1500 models, Ultimate 1500 series, GM 5000 / GM 10000, or LineLazer 5000), this OEM valve is typically the correct replacement. When in doubt, reference the parts manual by model number.

Noticeable pressure loss, pulsation, erratic spray pattern, difficulty priming, or leaks in the fluid section usually indicate the valve or nearby components (packings, ball, seat) are worn and should be serviced.

It’s best practice to inspect—and often replace—adjacent wear parts such as packings, the ball/seat, and seals during a valve change. This helps restore full performance and reduces repeat teardown.

Yes—220631 is an OEM Graco piston valve. Using OEM parts maintains correct tolerances and compatibility with the fluid section.

Follow the torque and lubrication guidance in your model’s service manual. After reassembly, prime the unit, check for leaks, and verify stable pressure and pattern.