Part number 138481 is an Inlet Valve Housing, a critical structural component in compatible piston pumps. This housing contains and supports the internal parts of the inlet check valve assembly, including the ball, seat, and spring. It forms part of the pump's fluid path and is essential for creating a reliable one-way valve for suction and pressure.
| Part Number | 138481 |
|---|---|
| Part Description | Inlet valve housing |
| Fits | Helix VR; Helix FR |
| Condition | New |
Part number 138481 is the Inlet Valve Housing, a machined metal block that serves as the main body for the pump's inlet check valve. This component provides the threaded or sealed connections for the fluid inlet line and the passage to the pump chamber. It houses the inlet ball, seat, and spring, aligning them precisely to form an effective one-way check valve that is crucial for the pump's suction and pressure cycles.
The housing itself can fail due to cracking, thread damage, or wear in the sealing surfaces. A damaged housing will prevent the internal valve components from sealing correctly, leading to persistent leaks, prime loss, and low pressure that cannot be fixed by replacing the ball or spring alone.
| Component Enclosure | Provides the machined chamber that contains the ball, seat, and spring |
|---|---|
| Fluid Path Integration | Forms the sealed passage between the suction line and the pump chamber |
| Alignment & Sealing | Ensures the valve components are correctly aligned for a proper seal |
| Physical Damage | Housing is cracked, has broken threads, or a damaged sealing face |
|---|---|
| Internal Wear/Erosion | The seat pocket or fluid passages are worn or eroded from abrasive material |
| Persistent Leak | Leakage continues after replacing all internal valve seals and components |
| Corrosion | Severe corrosion compromises the structural integrity or sealing surfaces |
Part number 138481 is designed for the inlet valve assembly on 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 | Inlet valve housing |
| Helix FR |
The inlet valve housing is the foundation for a complete valve assembly. When it is replaced, all internal components are typically installed as new.
A kit that includes the housing, ball, seat, spring, and necessary seals for a total rebuild.
The outlet (discharge) valve works in tandem with the inlet valve and is often serviced at the same time.
The housing often connects to a pump manifold. Inspect this adjacent part for damage or worn threads.
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