Part 315-180 is a stainless steel ball, 1‑3/4" in diameter, used as a critical check valve component in Hydra M and Hydra Pro Super airless paint sprayers. The ball works with a seat to control fluid flow direction, preventing backflow and maintaining consistent pressure. Replacing a worn, corroded, or out‑of‑round ball restores proper valve sealing and pump efficiency.
| Part Number | 315-180 |
|---|---|
| Part Description | Stainless Ball, 1‑3/4" |
| Brand | Hydra |
| Fits | Hydra M; Hydra Pro Super |
| Condition | New |
The 315-180 stainless steel ball is a precision‑ground component used in the fluid pump check valve assembly of Hydra M and Hydra Pro Super airless paint sprayers. Together with a corresponding valve seat, it acts as a one‑way valve, allowing fluid to flow in only one direction—essential for building and maintaining spray pressure during operation.
Over time, the ball can become worn, pitted, or out‑of‑round due to abrasive paint particles, corrosion, or mechanical impact. A compromised check ball leads to pressure loss, erratic spray, hard starting, or complete loss of prime. Replacing the ball with a genuine stainless steel component restores positive sealing and pump efficiency.
| Check valve function | Seals against the seat to prevent backflow and maintain pressure |
|---|---|
| Fluid direction control | Ensures paint moves from the pump to the hose/gun without reverse flow |
| Durability | Stainless steel resists corrosion and wear from abrasive coatings |
| Loss of prime / hard starting | Sprayer struggles to build or hold pressure; fluid bypasses the valve |
|---|---|
| Pressure fluctuation | Inconsistent spray pattern or surging pressure during operation |
| Visible wear / pitting | Ball surface is rough, pitted, or out‑of‑round upon inspection |
| Seat damage | If the valve seat is worn or nicked, the ball should also be replaced |
Part number 315-180 is used in the fluid pump check valve assembly of the following Hydra airless sprayers. Verify with your machine’s parts diagram for exact application.
| Sprayer Model | Component |
|---|---|
| Hydra M | 1‑3/4" Stainless Steel Check Ball |
| Hydra Pro Super | 1‑3/4" Stainless Steel Check Ball |
When replacing the check ball, these associated components should be inspected and often replaced at the same time.
The seat must be smooth and free of nicks or grooves. Replace if damaged to ensure proper sealing.
Worn packings can allow bypass and mimic check valve failure. Consider a full pump rebuild kit.
Seals around the valve assembly should be replaced to prevent external leaks.
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