Product Name: Seal Guide (Part No. 510000270)

Description:
This component is a seal guide, also known as a guide bushing, specifically designed for the on/off valve assembly (water switch) in high-pressure waterjet cutting systems. It is a precision-machined guide element that ensures proper alignment and smooth linear motion of the valve stem (needle) within the valve body.

In the Dardi system, this part (EWV0006) is a critical component of the on/off valve repair kit, which includes the seat, seal guide, sealing ring, needle, seal, and bushing. The seal guide provides a low-friction bearing surface, protecting both the valve stem and the valve body from direct metal-to-metal contact and preventing lateral movement that could cause misalignment or accelerated wear.

Applications:

• Guides the valve stem (needle) within the on/off valve assembly of waterjet cutting systems

• Ensures precise axial alignment of the valve stem with the valve seat during opening and closing cycles

• Compatible with Dardi waterjet systems and other manufacturers using standard on/off valve designs

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

• Used in the Dardi system to prevent water leakage and ensure proper valve operation

Features:

• Precision-Machined Geometry: Manufactured to exact tolerances to provide a perfect fit with the valve stem and valve body

• Low-Friction Surface: Smooth internal bore minimizes friction on the valve stem during reciprocating motion

• Wear-Resistant Material: Constructed from hardened steel or bronze, offering excellent durability under high-cycle operation

• Corrosion-Resistant: Treated to withstand water and abrasive dust exposure in harsh waterjet environments

• Material Composition: Steel + plastic + bronze (construction material as listed in Dardi on/off valve kit)

Maintenance:

Failure Diagnosis:

• Water Leakage: If water leaks from the cutting head when the valve is closed, the seal guide may be worn, allowing the valve stem to misalign with the seat

• Inconsistent On/Off Response: Slow or erratic valve actuation may indicate a worn or damaged seal guide causing binding

• Visible Wear Marks: During disassembly, inspect the internal bore of the seal guide for scoring, galling, or uneven wear patterns

Inspection and Replacement Procedures:

• Disassembly: Remove the on/off valve assembly following manufacturer guidelines. Extract the valve stem and seal guide from the valve body

• Surface Inspection: Examine the internal bore of the seal guide for scratches, grooves, or deformation. Check for any signs of metal transfer from the valve stem

• Dimensional Check: Measure the internal diameter to detect wear beyond manufacturer-specified limits

• Set Replacement: The seal guide should be replaced as part of a complete on/off valve repair kit (e.g., Dardi kit includes: seat EWV0008, seal guide EWV0006, sealing ring 720310077, needle EWV0009, seal EWV0010, bushing EWV0011)

• Clean Installation: Ensure the valve body cavity and seal guide bore are thoroughly cleaned before installing new components

• Lubrication: Apply high-pressure grease to the seal guide and valve stem during reassembly to prevent dry startup and ensure smooth operation

• Full Depressurization: Always fully depressurize the waterjet system and follow lockout/tagout procedures before servicing the on/off valve assembly