Airless part 730-520 is a foot valve assembly – a critical component that sits at the inlet of the pump on compatible Airless, Epic, and PowrLiner sprayers. This assembly allows fluid to enter the pump while preventing backflow, ensuring consistent priming and maintaining suction. Replacing a worn, leaking, or clogged foot valve assembly restores prime, eliminates pressure loss, and ensures reliable pump operation.
| Part Number | 730-520 |
|---|---|
| Part Description | Foot Valve Assembly |
| Brand | Airless |
| Fits | Airless Sprayer 660 XC, 690 GXC; Epic 447 HPX, 660 HPX, 690 HPG; PowrLiner 3100 |
| Condition | New |
The Airless 730-520 Foot Valve Assembly is a critical component installed at the fluid inlet of compatible Airless, Epic, and PowrLiner sprayers. It functions as a one‑way check valve that allows fluid to be drawn into the pump during the suction stroke while preventing backflow during the pressure stroke. This assembly is essential for maintaining prime, ensuring consistent flow, and achieving rated pressure.
Over time, the foot valve can wear, become clogged with debris, or develop leaks due to deteriorated seals or a weakened spring. A faulty foot valve causes loss of prime, erratic pressure, reduced flow, and may make the pump difficult to start. Replacing the foot valve assembly restores proper inlet sealing, eliminates suction leaks, and ensures the pump delivers consistent performance.
| Inlet check | Allows fluid to enter the pump on the suction stroke |
|---|---|
| Prevents backflow | Closes during the pressure stroke to maintain prime and prevent fluid from returning to the tank |
| Priming aid | Keeps the pump ready to self‑prime by holding fluid in the suction line |
| Loss of prime | Pump will not draw fluid or loses prime after stopping |
|---|---|
| Debris / clogging | Visible obstruction prevents proper sealing or flow |
| Worn seals or spring | Valve does not close fully, allowing backflow |
| During pump overhaul | Always replace when rebuilding to ensure reliable priming |
Airless part 730-520 is used on the following models. Always confirm with your machine's parts diagram.
| Model | Component |
|---|---|
| Airless Sprayer 660 XC | Foot Valve Assembly |
| Airless Sprayer 690 GXC | Foot Valve Assembly |
| Epic 447 HPX | Foot Valve Assembly |
| Epic 660 HPX | Foot Valve Assembly |
| Epic 690 HPG | Foot Valve Assembly |
| PowrLiner 3100 | Foot Valve Assembly |
When replacing the foot valve assembly, these associated components are often inspected or replaced.
Check for cracks, loose clamps, or a clogged strainer that could cause priming issues.
If the foot valve failed, the pump may have ingested debris; replace all seals and o‑rings.
Inspect fittings for air leaks that could mimic foot valve failure.
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