On/Off Repair Kit | HJ-001959-1
The HJ WATERJET On/Off Valve Repair Kit, 60K (HJ-001959-1 or HJ-302001-1) is a precision-engineered On/Off Valve Maintenance Kit for high-pressure on/off valve assemblies used in waterjet cutting systems operating up to 60,000 PSI (4,100 bar).
The HJ-001959-1 or HJ-302001-1 On/Off Valve Repair Kit is designed to restore the internal sealing system and actuation performance of the on/off valve—the component responsible for controlling the start and stop of the cutting stream at the cutting head.
Over time, internal valve components experience wear due to extreme pressure cycling, water erosion, and contamination, leading to issues such as leakage, slow response, or incomplete shutoff. The HJ-001959-1 or HJ-302001-1 On/Off Valve Repair Kit replaces those critical wear elements, restoring the valve to optimal performance and reliability.
The HJ-001959-1 or HJ-302001-1 include the following parts:
HJ-001328-1 or HJ-100061-1 On/Off Valve Poppet Seal
HJ-001337-1 or HJ-100062-1 On/Off Valve Backup Ring, Seal
HJ-A-0275-014 or HJ-400043-014 On/Off Valve O-Ring
HJ-A-0275-006 or HJ-400043-006 On/Off Valve O-Ring
HJ-006933-1 or HJ-100059-1 On/Off Valve Seat Poppet, SST
HJ-006934-1 or HJ-100060-1 On/Off Valve Poppet, SST
Key Benefits
- Restores Valve Sealing Integrity – Eliminates leaks and pressure loss
- Improves Response Time – Faster, more precise on/off control
- Extends Valve Service Life – Reduces internal wear
- Reduces Downtime – Prevents unexpected valve failure
- Cost-Effective Repair – Avoids full valve replacement
Applications
- Industrial waterjet cutting systems
- Automotive manufacturing (robotic cutting and trimming)
- Aerospace component cutting
- Metal, stone, and composite cutting
- High-production environments
Frequently Asked Questions | HJ-001959-1
- What is HJ Waterjet part number HJ-001959-1?
HJ-001959-1 is a direct replacement for FLOW 001959-1 On/Off Valve Maintenance/Repair Kit used to rebuild the Flow Insta I high-pressure on/off valve.
- Is HJ-001959-1 a complete valve assembly?
No. It is a repair/maintenance kit for the on/off valve, not the complete valve body or complete valve assembly.
- What are the cross-reference part numbers for HJ-001959-1?
Common references include:
- Flow: 001959-1
- Flow: TL-004001-1
- H2O: 302001-1
- KMT: 20458839
- What pressure is the HJ-001959-1 kit designed for?
The kit is associated with Flow''s 60K high-pressure on/off valve system, meaning applications up to approximately 60,000 PSI.
- When should I replace the HJ-001959-1 components?
Replacement is appropriate when the on/off valve begins leaking, weeping, failing to shut off cleanly, or showing degraded performance. HJ Waterjet recommends replacing the seat and poppet during scheduled rebuilds.
- Can I buy the components individually instead of the complete HJ-001959-1 kit?
Yes. Components such as the HJ-006933-1 Poppet Seat, HJ-006934-1 Poppet, HJ-001328-1 Seal, HJ-001337-1 Backup Ring, and HJ-A-0275-014 O-Ring are available individually.
- What is the difference between HJ-001959-1 and HJ-010200-1?
Both are Flow-style on/off valve maintenance kits, but HJ-001959-1 is associated with the Insta I valve, while HJ-010200-1 is associated with the On/Off Valve II.
- What are the symptoms of a worn HJ-001959-1 valve kit?
Typical symptoms include water leakage/weeping through the valve, slow or incomplete shutoff, increased venting, inconsistent cutting, and premature wear of downstream components.
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