Graco 218197 Piston Valve

The Graco 218197 Piston Valve is a genuine OEM fluid-section component designed for Graco airless paint sprayers. It ensures smooth paint flow and consistent spray pressure by maintaining a tight seal in the pump assembly. Commonly replaced during pump rebuilds or pressure loss issues.

OEM Graco part – reliable performance and durability
Used in multiple Graco models including 190ES, 395 ST, 490 ST, and Ultra Max II 695
Essential for restoring pump efficiency and maintaining proper pressure
Easy to install with standard service tools

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Description

Compatible Machines (for 218197)

Use this list to quickly confirm fitment before ordering. Always verify with your sprayer’s parts manual or serial range.

Graco 190 ES (Stand & Hi-Boy)
Graco 380 EM, 390 EM
Graco 395 ST, 395 Duron
Graco 400 Ultra
Graco 450 ST, 455 ST
Graco 490 EM Series, 490 ST (Lo-Boy & Hi-Boy)
Graco 495 Duron (Lo-Boy & Hi-Boy), 495 ST & 495 Hi-Boy
Graco 500 Ultimate, 500 Ultra Series
Graco Ultimate 600 Plus
Graco Ultra Max II 695 Series
Graco GM 3000 Series
Graco LineLazer 3400

Overview & Key Details

The Graco 218197 Piston Valve (also noted as 218-197) is an OEM fluid-section component used in many Graco airless sprayers. It works with the displacement rod, ball/cage, and packings to control fluid sealing and flow for reliable priming, pressure, and spray performance.

Part Number	218197 (aka 218-197)
Type	Piston valve (fluid section)
Used In	See Compatible Machines list above
Notes	Install with clean components; inspect ball/cage & packings during service

When to Replace

Loss of pressure, hard priming, or pulsation under load
Visible wear or damage to sealing surfaces
Recurring leaks after packing service

Service Tips

De-pressurize and flush the sprayer before disassembly.
Check the ball/cage, displacement rod, and packings for wear at the same time.
Use OEM torque specs and follow the machine’s service manual.
Prime with appropriate fluid and verify pressure/flow after reassembly.

Frequently Asked Questions

No—this listing is for the piston valve component only. Inspect and order related parts (ball/cage, packings, seals) as needed per your sprayer manual.

It fits many models and revisions, but serial breaks can apply. Confirm against your model’s parts list/diagram for your exact serial range before purchase.

De-pressurize, clean the fluid section, and lightly lubricate as specified. Use correct torque and re-check for leaks/prime performance after install.

Hard priming, pressure drop, surging, or fluid bypass. If symptoms persist after packing replacement, inspect the piston valve and ball/cage.

Yes, 218197 refers to the OEM Graco piston valve part number used across multiple models listed above.