Repair Kit, Pneumatic Valve Assembly, NC, UHP, 20477521

PNEUMATIC VALVE REPAIR KIT, NORMALLY-CLOSED, UHP, 90K

HJ-20477521

KMT PART NUMBER: 20477521

ADDITIONAL REFERENCES: 105415

 

This kit includes the following parts:

HJ-72112069 Seal Assembly, Pneumatic Valve, 1/4"

HJ-20475874 Backup Ring Pneumatic Valve, UHP

HJ-20475878 Pneumatic Valve, Valve Stem UHP

HJ-10178697 Pneumatic Valve Seat

HJ-49895584 O-Ring HP Valve

HJ-20475882 UHP Stainless Steel Backup Ring

HJ-10150233 O-Ring, Piston, Actuator Assembly,NC, UHP

 

Compatible with the following KMT Style Pumps:

Pro I

Pro II

Pro III

Kit, Pneumatic Valve Repair, UHP, Normally Closed (NC), 90K | HJ-20477521


The HJ-20477521 Pneumatic Valve Repair Kit is specifically engineered to rebuild and restore the Normally Closed (NC) 90K Pneumatic Valve used in KMT 90,000 PSI intensifier pumps.

Designed to meet and exceed original specifications, this HJ-20477521 repair kit replaces critical internal wear components that are exposed to continuous high-pressure cycling. Regular maintenance with HJ Waterjet parts helps prevent air leaks, pressure loss, valve sticking, and unexpected production downtime while extending the service life of your ultra-high-pressure waterjet equipment.

Manufactured from premium materials including precision-machined stainless steel, brass, and high-performance sealing compounds, this repair kit delivers dependable sealing performance, smooth valve operation, and maximum reliability in demanding industrial waterjet cutting applications.

 

Features

  • OEM Part Number: 20477521
  • Designed for 90,000 PSI (90K) Normally Closed Pneumatic Valves
  • Restores original valve performance and sealing integrity
  • Precision-manufactured to OEM tolerances
  • Helps eliminate internal air leakage and pressure loss
  • Extends valve service life
  • Minimizes unexpected equipment downtime
  • Easy installation during scheduled maintenance
  • Built for demanding industrial environments

 

Applications

The HJ-20477521 Pneumatic Valve Repair Kit is ideal for servicing Normally Closed (NC) 90K pneumatic valves used on KMT ultra-high-pressure intensifier pumps operating at 90,000 PSI. It is widely used across numerous industries, including:

  • Aerospace manufacturing
  • Automotive production
  • Steel fabrication
  • Stone and granite cutting
  • Glass processing
  • Composite materials
  • Defense manufacturing
  • Industrial fabrication
  • Precision waterjet cutting facilities

 

Benefits of Preventive Maintenance

Replacing worn valve components before failure helps:

  • Maintain consistent cutting pressure
  • Improve valve response time
  • Reduce compressed air leaks
  • Prevent unexpected equipment failures
  • Extend pump component life
  • Increase overall production efficiency
  • Lower long-term maintenance costs

Routine maintenance using HJ Waterjet repair kits helps keep your waterjet system operating at maximum productivity and reliability.

 

Why Choose HJ WATERJET Parts?

HJ WATERJET replacement parts are manufactured to the highest quality standards for unmatched durability, precise fitment, and dependable performance. HJ Waterjet components are engineered to ensure maximum reliability and minimizing the risk of premature wear or equipment failure.

** HJ WATERJET IS IN NO WAY AFFILIATED WITH GMA, EBBCO, KENNAMETAL, KMT, FLOW, BFT, H2O, OMAX, ACCUSTREAM, HYPERTHERM OR TECHNI. PART NUMBERS ARE FOR CONVENIENCE ONLY.

© 2026 HJ WATERJET. ALL RIGHTS RESERVED.

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