Product Name: O-Ring, -018 (Part No. 200905)

Description:
This component is an O-ring seal, AS568 standard size -018, specifically designed for high-pressure waterjet cutting systems . It is a precision-molded elastomeric sealing ring manufactured from premium-grade materials such as Buna-N (Nitrile), Viton (FKM), or EPDM, chosen for their excellent resistance to water, hydraulic fluids, and extreme mechanical stress .

The O-ring functions as a critical static or dynamic sealing component within the waterjet intensifier pump assembly, providing a leak-proof barrier between mating surfaces such as the check valve body, cylinder liner, outlet manifold, and other hydraulic interfaces . It is designed to maintain sealing integrity under continuous ultra-high pressure operation up to 60,000 PSI (approximately 4,137 bar) and can withstand temperatures ranging from -30°C to +200°C depending on material selection .

This O-ring is an OEM direct replacement part compatible with OMAX, AccuStream, KMT, FLOW, BFT, KUNDA, and WSI waterjet systems . It ensures reliable sealing compression, pressure retention, and hydraulic integrity even under extreme pressure fluctuations and abrasive environmental conditions .

Applications:

• Provides static sealing in check valve bodies, cylinder liners, and outlet manifolds of waterjet intensifier pumps

• Used as a sealing component within the high-pressure water circuit and hydraulic system

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

• Compatible with OMAX, AccuStream, KMT, FLOW, BFT, KUNDA, and WSI waterjet systems

• Used extensively in metal fabrication, stone cutting, ceramic machining, and composite processing 

Features:

• Standard AS568 Size -018: Conforms to industry-standard dimensions for precise, reliable fitment in designated seal grooves

• Premium Material Options: Available in Buna-N, Viton (FKM), or EPDM for excellent chemical compatibility and compression set stability 

• High-Pressure Rating: Engineered for continuous operation at 60,000+ PSI (4,100+ bar) 

• Wide Temperature Range: Performs reliably from -30°C to +200°C depending on material selection 

• Precision-Molded Dimensions: Uniform cross-section and tight dimensional tolerances for perfect sealing between mating components 

• Chemical Compatibility: Resistant to water, hydraulic fluids, and common water treatment additives 

Maintenance:

Failure Diagnosis:

• External Water Leakage: Visible water weeping from the pump area or valve body indicates O-ring failure requiring immediate replacement

• Pressure Drop: Inability to maintain rated cutting pressure may indicate seal degradation or extrusion

• Physical Damage During Inspection: Replace immediately if the O-ring shows signs of nicks, cuts, flattening (compression set), fraying, misalignment, hardening, or cracking 

• Filter Gauge Reading: If the filter gauge approaches 25 psi or lower while the pump is running, inspect the filter housing O-ring 

Inspection and Replacement Guidelines:

• Single-Use Component: This O-ring is a consumable sealing element. Always replace with a new one whenever the associated pump component or valve assembly is disassembled. Do not reuse old O-rings 

• Preventive Replacement Schedule: For filter housing applications, inspect the O-ring periodically and replace every two years or immediately if leaking is detected 

• Inspection Frequency: High-pressure O-rings should be checked for wear every 20–50 operating hours 

• Clean Installation: Before installing a new O-ring, thoroughly clean the groove and mating surfaces with a soft cloth. Remove all debris, old seal residue, and mineral deposits

• Lubrication: Apply a thin, uniform layer of manufacturer-recommended high-pressure grease to the O-ring during installation to prevent pinching, rolling, or tearing during assembly

• Seating Verification: Ensure the O-ring is not twisted and is fully seated in its groove before reassembling mating components. You should see it nest inside the connector if installed correctly 

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

• Torque Compliance: When reassembling, tighten all retaining components to the specific torque values listed in the equipment service manual to ensure proper O-ring compression without over-compression or damage

• Use Appropriate Tools: Use a dental pick or needle nose pliers to remove damaged O-rings and push new ones into place 

• Storage: Store spare O-rings in a cool, dry environment (15–25°C, humidity <65%) away from direct sunlight, ozone sources, and chemicals to prevent premature aging

Cross-Reference Information:

• OMAX #200905

• Also known as URETHANE O-RING SIZE -018