Product ID: 05149703 – HP Seal Assembly / Dynamic Seal Assembly

Description:
This component is a high-pressure (HP) dynamic seal assembly, specifically designed for use in the intensifier pumps of ultra-high pressure waterjet cutting systems . It is a pre-assembled kit of precision consumable parts that creates the critical seal between the reciprocating plunger and the high-pressure cylinder. This assembly prevents high-pressure water from leaking past the plunger during the compression stroke, ensuring that the full cutting pressure is delivered to the cutting head .

This dynamic seal assembly is specifically designed for intensifier pumps that utilize a 0.88 inch (7/8") diameter plunger and is rated for operation at 3,800 bar / 55,000 PSI to 4,100 bar / 60,000 PSI . It is a direct replacement part for use on SL-IV Plus (flange units), SL-V, and SL-V HSEC series intensifier pumps . Alternative OEM part numbers include 1-12339 and 20422243 .

Applications:

• Used in waterjet cutting intensifier pumps to dynamically seal the reciprocating high-pressure plunger within the cylinder bore.

• Installed inside the high-pressure cylinder, surrounding the plunger rod to prevent high-pressure water from escaping to the lower-pressure side of the pump .

• Suitable for ultra-high pressure waterjet systems operating at 55,000–60,000 PSI (approximately 3,800–4,137 bar).

• Compatible with KMT SL-IV Plus, SL-V, and SL-V HSEC intensifier pumps, as well as WSI and other OEM systems using .875 inch plunger technology .

Features:

• Complete Assembly: The kit contains all necessary sealing components for a full replacement, typically including a dynamic seal backup, a static seal, an O-ring, and high-vacuum grease .

• Material Composition: Manufactured from extremely wear-resistant, high-pressure-rated materials (e.g., polyurethane, PTFE) to withstand the high-velocity movement of the plunger and the erosive nature of ultra-high pressure water.

• Wear Resistance: Engineered as a high-wear consumable; its design focuses on providing a long, consistent service life while protecting the more expensive plunger and cylinder bore from direct metal-to-metal contact.

• Grease Included: Pre-packaged with high-vacuum grease (5 grams) to lubricate the seals during installation, preventing dry start-up and ensuring proper initial sealing .

Maintenance:

• Critical Wear Component: The HP seal assembly is a primary consumable part. It requires periodic replacement as its performance degrades over time due to friction and pressure cycling .

• Performance Monitoring: Signs that the seal assembly requires replacement include a drop in cutting pressure, increased pump cycling frequency, visible water dripping from the pump's weep hole, or water contamination of the hydraulic oil.

• Preventive Replacement: It is recommended to replace the HP seal assembly as part of a scheduled preventive maintenance plan (e.g., after a specific number of operating hours) rather than waiting for failure to avoid unplanned downtime .

• Lubrication: During installation, the new seals must be generously lubricated with the provided high-vacuum grease (or a manufacturer-approved equivalent) to prevent friction damage during the initial break-in period.

• Full Depressurization: Always fully depressurize the waterjet system, shut off the low-pressure water supply, and follow lockout/tagout safety procedures before replacing the seal assembly.

• Simultaneous Replacement: While replacing the seals, inspect the plunger surface and the cylinder bore for scoring, pitting, or wear. A damaged plunger or cylinder will rapidly destroy a new seal assembly.

• Correct Tools: Use manufacturer-specified seal removal and installation tools to avoid scratching the cylinder bore or damaging the new seals during the procedure.