Product Name: Water On/Off Valve Seal Seat (Part No. 520001554)

Description:
This component is a seal seat specifically designed for the water on/off valve (water switch) in high-pressure waterjet cutting systems. It is a precision-machined, disc-shaped sealing component that serves as the stationary sealing surface within the valve body. The seal seat works in conjunction with the valve stem (needle) to create a leak-tight, one-way seal, controlling the flow of ultra-high-pressure water from the pump to the cutting head. It is engineered from wear-resistant materials to withstand the repeated impact and high-velocity water flow encountered during continuous operation .

Applications:

• Provides the stationary sealing surface for the water on/off valve assembly in waterjet cutting systems

• Used in conjunction with the valve stem to stop and start the high-pressure water flow

• Suitable for ultra-high pressure waterjet systems operating at 60,000–90,000 PSI (approximately 4,137–6,200 bar)

• Compatible with DARDI waterjet cutting systems 

Features:

• Precision Sealing Surface: Machined to exact tolerances for leak-tight shut-off when mated with the valve stem

• Wear-Resistant Material: Constructed from high-quality metal alloy for long service life 

• Critical Consumable: Designed as a wear component that protects the more expensive valve body from damage

• High-Pressure Compatibility: Engineered to withstand extreme pressure cycling without deformation or failure

• Direct OEM Replacement: Specifically designed as a replacement part for DARDI waterjet systems 

Maintenance:

Failure Diagnosis:

• Water Leakage from Cutting Head: If water drips from the mixing tube when the valve is closed, the seal seat is likely worn and requires immediate replacement

• Pressure Drop: Inability to maintain rated cutting pressure indicates possible seal seat wear or damage

• Visible Wear: During disassembly, inspect the sealing surface for pitting, grooving, erosion, or indentation

Replacement Procedures:

• Simultaneous Replacement: When replacing the seal seat, always replace the corresponding valve stem (needle) simultaneously. Reusing a worn stem with a new seat will compromise sealing and shorten the life of both components

• O-Ring Replacement: Replace all associated O-rings and backup rings when servicing the valve

• Full Depressurization: Always fully depressurize the waterjet system and follow lockout/tagout procedures before removing or servicing the valve

• Clean Installation: Thoroughly clean the valve body cavity and sealing surfaces before installing new components

• Lubrication: Apply high-pressure grease to the seal seat and associated seals during installation to prevent dry start-up

• Torque Compliance: Tighten the retaining components to the specific torque values listed in the equipment service manual

• Replacement Indicators: Replace immediately if the sealing surface shows visible wear, pitting, or cracking. Even minor surface damage can cause leakage

Water Quality Impact:

• Poor water quality (contaminants, hardness, inadequate filtration) accelerates seal seat wear

• Maintain proper water filtration to maximize component service life