Product Name: HP Seal Buttress (High Pressure Seal Buttress) / Part No. 100021-3

Description:
This component is a high-pressure seal buttress, specifically designed as a support ring for the dynamic high-pressure seal assembly in 60,000 PSI (approximately 4,137 bar), 15 GPM waterjet intensifier pumps . The seal buttress is a precision-machined rigid ring typically manufactured from high-strength engineered plastic or metal composite, positioned adjacent to the primary HP dynamic seal within the high-pressure cylinder seal stack.

The buttress serves as an anti-extrusion backup component, preventing the softer HP seal material from deforming into the clearance gap between the plunger and cylinder bore under ultra-high pressure . Modern designs feature precision machining on the inner diameter (ID) to ensure a tight fit against the plunger, minimizing the extrusion gap and significantly extending HP seal life . Some buttress designs also incorporate unique grooves on the outer edge to simplify removal during maintenance .

This component is rated for continuous operation at 60,000 PSI (4,137 bar) with 15 GPM flow capacity and is compatible with standard waterjet intensifier pumps from major manufacturers.

Applications:

• Installed as a support ring adjacent to the HP dynamic seal in the high-pressure cylinder seal stack

• Prevents seal extrusion during the compression stroke in 60,000 PSI, 15 GPM waterjet intensifier pumps

• Used during major pump overhaul and HP seal replacement procedures

• Compatible with standard waterjet intensifier systems

Features:

• Precision-Machined ID: Tight tolerance on inner diameter prevents HP seal from extruding between the plunger and buttress 

• Anti-Extrusion Function: Provides rigid mechanical support that fills the clearance gap, protecting the primary seal from pressure spikes

• Easy Removal Design: Unique grooves on the outer edge simplify gripping and removal during maintenance 

• High-Pressure Rating: Engineered for continuous operation at 60,000 PSI (4,137 bar)

• Precision Tolerances: Manufactured to exact specifications for perfect fit within the cylinder bore and against the plunger

• Durable Material: Constructed from wear-resistant material to withstand extreme pressure cycling

Maintenance:

Failure Diagnosis:

• External Water Leakage: Water weeping from the pump weep hole indicates HP seal or buttress failure 

• Pressure Drop: Inability to maintain rated cutting pressure suggests seal stack degradation

• Visible Damage During Inspection: Inspect the buttress for signs of wear, scoring, cracking, or deformation. Replace immediately if any damage is visible

Replacement Guidelines:

• Replace as a Set: Always replace the HP seal buttress together with the HP dynamic seal whenever the seal stack is serviced . Do not reuse old buttresses with new seals

• Clean Installation: Perform seal replacement in a designated clean area to prevent contamination of new components with abrasive particles 

• Plunger Surface Inspection (Critical): Before installing new seals and buttress, thoroughly inspect the ceramic plunger surface for scoring, scratching, pitting, dullness, or diameter reduction. A damaged plunger will rapidly destroy new seals 

• Plunger Surface Repair: Minor scratches on plunger surface may be polished using fine abrasive stone; replace plunger if damage is severe 

• Cylinder Bore Inspection: Inspect the high-pressure cylinder bore for scoring, pitting, or out-of-round conditions 

• Water Quality Impact: Poor water quality with contaminants accelerates seal and buttress wear. Maintain proper water filtration 

• Lubrication: Apply manufacturer-recommended high-pressure grease to seals and buttress during installation

• Use Proper Tools: Use manufacturer-specified seal installation tools to avoid damaging seals or scratching the cylinder bore

• Torque Compliance: When reassembling, tighten all retaining components to the specific torque values in the equipment service manual

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

• Storage: Store spare HP seal buttresses in a clean, dry environment away from direct sunlight, ozone, and chemicals