Product Name: Check Valve Assembly Repair Kit / Complete Pump Overhaul Kit (Part No. 305098)

Description:
This component is a comprehensive check valve assembly repair kit, also referred to as a complete pump overhaul kit, specifically designed for high-pressure waterjet intensifier pumps . The kit contains pre-assembled internal inlet check valve assemblies and related components required for a complete pump rebuild.

According to manufacturer specifications, this kit includes: (1) Minor Maintenance Kit (P/N 302700) and (3) Complete Check Valve Assemblies (P/N 303401) . The check valve assembly (303401) is a pre-assembled unit that controls one-way flow of water entering the high-pressure cylinder from the low-pressure supply. This kit is rated for continuous operation at 60,000 PSI (approximately 4,137 bar) and is manufactured for AccuStream/OMAX waterjet systems . Alternative or cross-reference part numbers include WO305098, VK9003, and 1-13715 .

Applications:

• Used for complete overhaul of waterjet intensifier pump check valve assemblies 

• Rebuilds the internal inlet check valves on both sides of the intensifier pump (3 assemblies required per pump) 

• Suitable for ultra-high pressure waterjet systems operating at 60,000 PSI and above

• Compatible with OMAX, MAXIEM, V-Pumps, and AccuStream waterjet intensifier systems 

Features:

• Complete Overhaul Solution: One kit contains all check valve assemblies needed for a full pump rebuild 

• Pre-Assembled Components: Includes complete check valve assemblies for drop-in replacement, reducing installation errors

• High-Pressure Rating: Engineered for continuous operation at 60,000+ PSI

• Multi-Brand Compatibility: Interchangeable with OMAX #305098, WO305098, and VK9003 

• OEM Quality: Manufactured for AccuStream (brand of Hypertherm Associates) to original equipment specifications 

Maintenance:

When to Rebuild (Failure Diagnosis):

• Localized Overheating: If a specific check valve assembly becomes noticeably hot during operation, it indicates internal leakage and requires replacement 

• Pressure Loss on One Stroke: If the intensifier builds no pressure when moving in one direction, the corresponding inlet check valve is damaged

• Uneven Cycling Speeds: If the piston moves faster in one direction than the other, a check valve assembly may be compromised

• Inability to Maintain Cutting Pressure: Gradual pressure drop (typically 30% or more) indicates worn check valve components 

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

• Scheduled Replacement: Manufacturers recommend check valve overhaul every 800-1,000 operating hours 

Upgrade Compatibility Note (Critical):
When upgrading from older 301641 check valve assemblies to the new 303401 assemblies (which are included in this kit), you must also upgrade to the 303294 liquid displacers simultaneously. Failure to do so will result in pump damage .

Installation Procedure:

• Full Depressurization: Always fully depressurize the waterjet system (high-pressure water, hydraulic system, and air supply) and follow lockout/tagout procedures before servicing

• Complete Replacement: Replace all three check valve assemblies when performing a complete pump overhaul

• Clean Installation: Thoroughly clean the check valve body cavities and all sealing surfaces before installing new assemblies

• Lubrication: Apply a thin layer of high-pressure grease to O-rings and seals during installation to prevent dry start-up

• Torque Compliance: Tighten the check valve retainer nuts to the specific torque values listed in the equipment service manual

• Use All Components: The complete overhaul kit includes 3 check valve assemblies (303401) and 1 minor kit (302700)—use all components for proper rebuild 

Cross-Reference Information:

• OMAX #305098 

• WO305098 

• VK9003 

• 1-13715 (AccuStream) 

• Complete Overhaul Kit