Product ID: 20428052 – Pneumatic On/Off Valve Seal Assembly

Description:
This component is a seal assembly designed for the pneumatic on/off valve (water switch) in high-pressure waterjet cutting systems . It is a critical dynamic sealing component containing the high-pressure seals, O-rings, and backup rings required to create a leak-tight seal between the valve stem and the valve body. This assembly is rated for ultra-high pressure operation up to 60,000 PSI (approximately 4,137 bar) .

Applications:

• Used as the primary seal within the pneumatic on/off valve assembly of waterjet cutting systems 

• Installed in the valve body, positioned between the brass backup ring (10188233) and the valve stem (20435636) 

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

• Compatible with KMT AccuStream, MotoJet pumps, and other standard waterjet systems 

Features:

• High-Pressure Seal Material: Manufactured from wear-resistant, ultra-high pressure-rated elastomer materials to withstand extreme pressure cycling and prevent leakage 

• Complete Assembly: Provides all necessary sealing components for the on/off valve dynamic seal interface

• Critical Sealing Interface: Functions as the dynamic seal that prevents high-pressure water bypass around the valve stem when the valve is closed

• High Wear Resistance: Engineered for high-cycle operation with resistance to abrasion from water contaminants 

• OEM Compatibility: Direct replacement part for KMT AccuStream waterjet systems, also used in MotoJet bleed down maintenance kits 

Maintenance:

• Critical Wear Component: The seal assembly is a high-wear consumable part. If the seals are damaged or worn, the valve will not close properly, resulting in water leakage from the cutting head, pressure drop, or inability to maintain rated cutting pressure 

• Performance Monitoring Indicators: Replace the seal assembly when water leaks from the cutting head when the valve is supposed to be closed, when pressure drop occurs, or during scheduled preventive maintenance 

• Inspection: During pneumatic valve overhaul, inspect the seal assembly for signs of wear, cuts, extrusion damage, or hardening. Even minor damage warrants replacement

• Simultaneous Component Replacement: When replacing the seal assembly, replace the brass backup ring (10188233) and inspect the valve stem (20435636) and valve seat (10178697). Replace worn components as a set for optimal sealing performance 

• Water Quality Impact: Poor water quality (contaminants, hardness, improper filtration) accelerates seal wear. If seals require replacement too frequently, investigate and improve water filtration/treatment systems 

• Full Depressurization: Always fully depressurize the waterjet system (both hydraulic and high-pressure water circuits), shut off compressed air supply, and follow lockout/tagout procedures before removing the valve assembly or replacing the seal assembly 

• Clean Area Maintenance: Perform seal replacement in a designated clean area to prevent contamination of new seals with debris or abrasive particles. Wear disposable gloves to prevent natural oils from being introduced to seal materials 

• Proper Lubrication: Apply manufacturer-recommended high-pressure grease to seals during installation to prevent pinching, rolling, or damage during assembly 

• Torque Compliance: When reinstalling, tighten the HP gland (BV701184) to the specific torque value listed in the equipment service manual to ensure proper seal compression 

• Kit Availability: This seal assembly is included in bleed down maintenance kits (e.g., 05116017) for MotoJet pumps, which contain all necessary components for a complete valve overhaul 

• Cross-Reference Part Numbers: May be referenced in import/export documentation under HSN Code 401693002900 and described as "Pneumatic Valve 20428052 (Water Felt)"