Seal Assembly, HP .875 Plunger, Hybrid, 60K PSI | HJ-20422243
The HJ WATERJET Seal Assembly, HP, .875 Plunger, 60K (HJ-20422243) is a precision-engineered high-pressure sealing solution designed for KMT-style waterjet intensifier pumps operating up to 60,000 PSI (4,100 bar).
The HJ-20422243 HP SEAL ASSEMBLY is engineered and specifically designed for .875 inch plunger diameter systems, ensuring optimal sealing performance, pressure retention, and long service life in demanding industrial environments.
The HJ-20422243 HP SEAL ASSEMBLY plays a critical role in the high-pressure wet end, preventing leaks and maintaining consistent pressure output required for reliable waterjet cutting performance.
Key Benefits
- High-Pressure Sealing Performance – Maintains consistent system pressure
- Leak Prevention – Reduces internal leakage and pressure loss
- Extended Pump Life – Protects critical intensifier components
- Improved Efficiency – Ensures optimal cutting performance
- Reduced Downtime – Reliable sealing reduces maintenance frequency
Compatible Pumps
The HJ-20422243 HP SEAL ASSEMBLY is compatible with the following KMT-style pumps:
Applications
The HJ-20422243 HP SEAL ASSEMBLY is widely used in:
- KMT-style Waterjet cutting systems (metal, composites, plastics)
- Automotive manufacturing (robotic cutting and trimming)
- Waterjet food cutting
- Aerospace component cutting
- Stone and glass cutting
- General industrial cutting operations
The HJ-20422243 HP Seal Assembly is used in compatible KMT Waterjet intensifier pumps requiring a .875-inch plunger high-pressure sealing solution. It is commonly installed during routine intensifier maintenance and rebuild procedures to restore peak operating pressure and maintain consistent cutting quality.
Frequently Asked Questions
Q: What is HP seal assembly HJ-20422243?
A: It is an HP (high-pressure) seal assembly for a 0.875-inch (.88-inch) plunger, used in KMT waterjet intensifier pumps. It is a 60K-class part, rated around 55,000–60,000 psi (3,800/4,100 bar) depending on the application.
Q: What is the primary function of HP seal assembly?
A: The seal assembly prevents high-pressure water from leaking around the reciprocating plunger. Proper sealing is essential for maintaining pump pressure and protecting the surrounding high-pressure components.
Q: Which KMT pumps use HJ-20422243?
A: Parts catalog identifies HJ-20422243 for NeoLine/SL-IV Plus, SL-V, and SL-VI units in the 15–60 HP range with a 0.88-inch plunger.
Q: What parts are associated with HJ-20422243?
Common components around this seal assembly include:
Q: Is HJ-05149703 the same as HJ-20422243?
A: Not necessarily. Both are 0.875-inch HP seal assemblies, but is assigned to different applications. HJ-20422243 is specified for NeoLine/SL-IV Plus, SL-V and SL-VI 15–60 HP units, while HJ-05149703 is specified for SL-IV Plus flange and SL-V HSEC applications.
Q: What are common symptoms of a worn HJ-20422243 seal assembly?
A: Typical indications include:
- Increasing high-pressure water leakage
- Difficulty maintaining operating pressure
- Pressure fluctuations
- Reduced cutting performance
- Increased pump cycling
- Water appearing around the HP cylinder/sealing-head area
- Accelerated wear of the plunger or cylinder components
Q: What should be inspected when replacing HJ-20422243?
A: Dont automatically replace only the seal. Inspect the 0.875-inch plunger, cylinder/liner, sealing head, spacer components, and related seals for scoring, wear, cracks, or deformation. A damaged mating component can quickly destroy a new seal.
Q: Can HJ-20422243 be used on a 90K pump?
A: No—not based solely on the part number. HJ-20422243 is a 60K-class HP seal assembly.
Q: What is the best way to identify the correct replacement?
A: Match all three: part number HJ-20422243 + 0.875-inch plunger + the specific pump/model and HP rating. This is safer than matching the seal by appearance alone.
Q: How is the HP Seal Kit SLIV + SLV installed?
A: Installation should be performed according to KMT service instructions. For best results, the seal kit should be installed by a trained technician experienced in waterjet pump maintenance. Use Tools For KMT Pumps.
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