Part 211-129 is a stainless steel ball used in pump valve assemblies for various airless and air-assisted sprayers. It functions as a check ball, creating a seal to control fluid flow direction and maintain consistent pressure.
| Part Number | 211-129 |
|---|---|
| Part Description | Stainless Steel Ball (Check Valve) |
| Brand | OEM / Genuine Replacement |
| Fits |
|
| Condition | New |
The 211-129 Stainless Steel Ball is a precision‑ground check ball used in the fluid pump valve assemblies of compatible sprayers. It works with a valve seat to create a one‑way seal, allowing paint or coating to flow in one direction while preventing backflow. This ensures consistent pressure, proper priming, and reliable spray performance.
Over time, the ball can become worn, pitted, or out‑of‑round, leading to poor sealing, pressure loss, or erratic operation. Replacing a damaged or worn ball with this genuine stainless steel part restores proper check valve function and helps extend pump life.
| One‑way flow control | Allows fluid to move forward during pump stroke and seals to prevent reverse flow |
|---|---|
| Pressure maintenance | Helps maintain consistent pressure by preventing backflow during the pump cycle |
| Priming capability | Enables the pump to draw fluid from the container and prime properly |
| Pressure loss / surging | Sprayer loses pressure while spraying or pressure fluctuates erratically |
|---|---|
| Loss of prime | Pump won’t prime or loses prime repeatedly |
| Visible wear / pitting | Ball shows corrosion, pitting, or is out‑of‑round |
| Poor sealing | Backflow through the pump when trigger is released (sprayer cycles slowly or not at all) |
Part 211-129 is compatible with the following models. Always verify fitment using the correct parts diagram for your specific sprayer revision.
| Model | Component |
|---|---|
| PowerCoat 630 | Stainless Steel Ball (Check Valve) |
| AirCoat 423 | Stainless Steel Ball (Check Valve) |
| Hydra X 4540 | Stainless Steel Ball (Check Valve) |
| Hydra X 4830 | Stainless Steel Ball (Check Valve) |
| Hydra X 5430 | Stainless Steel Ball (Check Valve) |
| Hydra X 5950 | Stainless Steel Ball (Check Valve) |
| Hydra X 6530 | Stainless Steel Ball (Check Valve) |
| Hydra X 7230 | Stainless Steel Ball (Check Valve) |
Check valve performance depends on multiple components. When replacing the ball, inspect these related parts.
The seat mates with the ball to create the seal. If worn or damaged, it should be replaced to ensure a tight seal.
Worn seals around the valve assembly can cause internal leakage and pressure loss.
Wear in the pumping cylinder can also cause pressure loss; inspect if replacing the ball doesn’t resolve the issue.
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