Part number 138406 is a Spring Inlet, designated PC3.39. This component is a critical part of the inlet check valve assembly in compatible piston pumps. The spring applies pressure to the inlet ball, ensuring it seats properly to create a one-way seal that allows fluid to enter the pump chamber and prevents backflow, which is essential for maintaining prime and pumping efficiency.
| Part Number | 138406 |
|---|---|
| Part Description | Spring Inlet PC3.39 |
| Fits | Helix VR; Helix FR |
| Condition | New |
Part number 138406 is an inlet spring, cataloged as PC3.39. This small but vital component is part of the pump's inlet check valve assembly. Its primary function is to apply a calibrated amount of force to the inlet ball, ensuring it returns to its seat quickly and securely after each pump stroke. This action is what creates the one-way check valve necessary for proper suction and pressure.
A weakened, broken, or missing inlet spring can cause the inlet ball to not seal properly. This leads to fluid leaking back into the supply line during the pressure stroke, resulting in a loss of prime, reduced pressure, erratic spray performance, and inefficient pumping.
| Ball Seating Force | Applies precise pressure to ensure the inlet ball seals against its seat |
|---|---|
| Valve Timing | Controls the speed at which the inlet check valve opens and closes |
| Suction Assistance | Helps create the vacuum needed to draw fluid into the pump chamber |
| Loss of Pump Prime | Pump will not hold prime or loses prime easily under pressure |
|---|---|
| Reduced Pressure/Flow | Inability to reach normal operating pressure due to internal leakage |
| Visible Damage | Spring is corroded, broken, or has visibly lost its coil tension |
| Preventive Maintenance | During any service or rebuild of the pump's inlet valve assembly |
Part number 138406 is designed for use in the inlet valve assemblies of Helix VR and Helix FR series pumps. Always confirm fitment using the correct parts diagram for your exact pump model and serial number.
| Compatible Models | Component |
|---|---|
| Helix VR | Spring Inlet PC3.39 |
| Helix FR |
The inlet spring is one part of a valve assembly. For a reliable repair, these related components are typically inspected and replaced as a set.
The spring works directly against the inlet ball. A worn ball or pitted seat will cause leaks regardless of spring condition.
The outlet (discharge) check valve has a similar spring. Both are often serviced together for balanced pump performance.
A complete kit includes the spring, ball, seat, and often the cage or housing for a full valve overhaul.
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