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.
