Adjustable Dump Orifice (ADO) Rebuild Kit | HJ-306500
The HJ-306500 Adjustable Dump Valve Repair Kit is a precision-engineered high-pressure rebuild kit designed to restore the performance, sealing integrity, and responsiveness of adjustable dump valve assemblies used in OMAX waterjet pump systems operating up to 60,000 PSI (60K).
The HJ-306500 Adjustable Dump Valve Repair Kit includes all critical wear components required to rebuild the dump valve, ensuring accurate pressure control, reliable system cycling, and leak-free operation in demanding industrial environments.
The HJ-306500 Adjustable Dump Valve plays a vital role in regulating pressure release and system unloading, and over time, internal components can wear due to extreme pressure, contamination, and high-cycle operation. The HJ-306500 Adjustable Dump Valve Repair Kit restores the valve to like-new condition, minimizing downtime and maintaining peak system performance.
Key Benefits
- Restores like-new valve performance
- Prevents leaks and pressure loss
- Ensures accurate pressure control
- Reduces downtime and maintenance costs
- Extends valve and pump lifespan
- Complete Seal & Wear Component Set
- 60K PSI High-Pressure Rated
- Critical for Pressure Control Systems
- Improves Reliability and Efficiency
Applications
- CNC waterjet cutting machines
- High-pressure pump systems
- Industrial manufacturing environments
- Continuous production operations
Frequently Asked Questions | HJ-306500
1. What is HJ Waterjet HJ-306500?
HJ Waterjet HJ-306500 is a direct replacement for OMAX 306500 Rebuild Kit for the Adjustable Dump Orifice (ADO) body assembly. It is designed to replace the wear components inside the adjustable dump valve/orifice assembly.
2. What does the HJ-306500 rebuild kit do?
The kit restores the sealing and flow-control components of the adjustable dump orifice, helping maintain proper pressure regulation and reliable pump operation.
3. What is an Adjustable Dump Orifice (ADO)?
The ADO is part of the pumps dump/pressure-control system. It allows water to be discharged through the dump circuit and helps control pump operation and pressure.
4. Is HJ-306500 a complete valve assembly?
No. It is a rebuild kit for the adjustable dump orifice body assembly, rather than the complete ADO body. HJ-306476 is the Body Assembly and HJ-306500 is its rebuild kit.
5. When should the HJ-306500 kit be replaced?
It should generally be considered when the adjustable dump assembly shows leakage, erosion, inconsistent pressure control, excessive wear, or poor pump performance. Regular inspection is important because waterjet pump components are exposed to high-pressure water and wear. It is recommended to regularly maintenance and replace worn or damaged components to minimize additional damage and downtime.
6. Can I replace individual components instead of the complete HJ-306500 kit?
Yes. Individual components such as the HJ-306609 seal assembly, HJ-306607 stem assembly, HJ-306477 tapered seat, and HJ-307002 erosion shield are available separately.
7. Is HJ-306500 the same as HJ-322536?
Not necessarily. This is an important ordering question. Current parts information identifies HJ-322536 as an updated ADO/MADO/MEFV body rebuild kit, while HJ-306500 is associated with the older ADO design. Some suppliers specifically state that the updated design uses an improved tapered seat and erosion shield and requires the corresponding updated body.
8. Can HJ-306500 be used to replace HJ-322536?
Do not assume they are interchangeable. The newer HJ-322536 configuration may require the corresponding updated body assembly. Verify the existing pump/ADO configuration before substituting one kit for the other.
9. Is HJ-306500 a pump rebuild kit?
It is more accurately classified as an Adjustable Dump Valve/Adjustable Dump Orifice body rebuild kit, not a complete pump rebuild kit
10. Is HJ-306500 used on the cutting head?
No. The HJ-306500 kit belongs to the pump-side adjustable dump valve/orifice assembly, not the cutting head or nozzle assembly.
11. Why replace the entire rebuild kit instead of only one seal?
Replacing the complete wear-component kit can be advantageous when multiple internal components have experienced wear. It allows the seat, stem, seals, backup components, and erosion protection to be renewed together rather than rebuilding an assembly with a mixture of old and new wear components.
12. Is HJ-306500 important for preventing pump downtime?
Yes. The adjustable dump assembly is part of the pumps pressure-management system. Keeping its wear components in good condition can help maintain reliable operation and reduce unexpected leakage and maintenance downtime.
18. What should I verify before ordering HJ-306500?
Verify:
- Pump model
- Pump series
- Pump serial number
- Existing adjustable dump valve/body configuration
- Whether the machine uses the older HJ-306500 configuration or updated HJ-322536 configuration
- Condition of the existing ADO body
Most important: Do not order solely by the part number if the pump has been upgraded.
Why Choose HJ Waterjet?
HJ Waterjet replacement parts are engineered to deliver premium-quality, reliable performance, precision fit, and long-lasting durability at a competitive price. Precision manufactured to exact specifications using high-quality materials and tight tolerances, our components are designed for compatibility with OEM waterjet systems and demanding industrial applications. By focusing on quality, precision, and value—not expensive branding—we help manufacturers reduce maintenance costs, minimize downtime, and maximize productivity without compromising performance or reliability. When precision matters, HJ Waterjet delivers the quality, reliability, and value professionals trust. Premium Performance Without the Premium Price