Product Name: Check Valve Repair Kit (Part No. 20458830)

Description:
The Check Valve Repair Kit 20458830 is a comprehensive maintenance kit specifically designed for overhauling the check valve assemblies in high-pressure waterjet intensifier pumps . This kit contains all the critical consumable components required to restore proper sealing and one-way flow control in the inlet and outlet check valves .

According to manufacturer specifications, this repair kit includes items 3, 4, 5, 6, 8, 9, and 10 from the Sealing Head Assembly (20458908) parts list . The comprehensive kit contains the following components :

The kit is fully compatible with KMT (KMT Waterjet Systems) and Fedjetting waterjet intensifier systems and is rated for continuous operation at 60,000–90,000 PSI (approximately 4,137–6,200 bar) . Cross-reference part numbers include 302003-2, 1-12656, 105693, and R00414 .

Applications:

• Rebuilds the check valve assemblies in waterjet intensifier pumps

• Restores proper sealing integrity and one-way flow control

• Used when check valve failure symptoms appear or during scheduled preventive maintenance

• Suitable for high-flow waterjet systems operating at 60,000–90,000 PSI

• Compatible with KMT, Fedjetting, and other standard waterjet intensifier systems 

Features:

• Complete Component Set: Contains all wear parts for a full check valve overhaul 

• OEM Quality: Precision-manufactured to meet original equipment specifications

• High-Pressure Rating: All components engineered for continuous operation at 60,000–90,000 PSI

• Critical Consumable Kit: Designed for periodic replacement during pump maintenance

• ISO 9001 Certified: Manufactured under certified quality standards 

Maintenance:

When to Replace (Failure Diagnosis):

• External Water Leakage: Visible water weeping from the check valve body indicates seal failure requiring kit replacement 

• Pressure Drop: Inability to maintain rated cutting pressure suggests worn valve components (seat, spring, or poppets) 

• Overheating Check Valve Body: Unusual heat in the check valve area indicates internal leakage

• Erratic Intensifier Cycling: Irregular pump cycling may be caused by check valve failure

• Scheduled Preventive Maintenance: Most manufacturers recommend servicing check valves every 1,500 operating hours or during major pump overhauls

Installation and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, bleed down all high-pressure lines, and follow lockout/tagout procedures

• Replace as a Complete Set: When servicing check valves, use all components in the kit simultaneously. Do not mix new components with old ones 

• Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the check valve body cavity and all sealing surfaces before installing new components

• Proper Lubrication: Apply a thin film of high-pressure grease to the O-rings (80077241) during installation to prevent dry start-up

• Component Orientation: Refer to the sealing head assembly diagram (20458908) for correct orientation of components 

• Torque Compliance: When reassembling, tighten the poppet retainer screw (20458089) to the specific torque value listed in the equipment service manual

• Inspect Valve Body: While servicing, inspect the sealing head body for pitting, scratches, or erosion; replace if necessary

• Water Quality Impact: Poor water quality accelerates wear on check valve components; maintain proper water filtration to extend component life 

• Store Properly: Keep spare repair kits in a cool, dry environment away from direct sunlight and chemicals

Cross-Reference Information:

• KMT / H2O Jet #20458830 

• 302003-2 

• 1-12656 

• 105693 / R00414