Dynamic Seal 302951 High Quality WaterJet Cutting Machines Parts

The Dynamic Seal 302951 is an OEM-style seal designed for high-pressure Waterjet Pumps, providing dynamic Sealing between the Piston-Assembly-05146576-Abrasive-Waterjet-Parts-In-Stock-p.html target='_blank'>Hydraulic Piston and cylinder bore to prevent fluid bypass and maintain consistent cutting pressure. With an outer diameter of 0.570″ and inner diameter of 0.311″, it’s molded from a gray, high-resilience elastomer to withstand repeated cycling up to 60 000 psi . 

Specifications
Manufacturer / OEM Part: 302951 
Outer Diameter (OD): 0.570 in (14.48 mm) 
Inner Diameter (ID): 0.311 in (7.90 mm)
Cross-Section: Standard dynamic seal profile
Material: Gray elastomer (proprietary blend for high-pressure wear resistance)
Pressure Rating: Up to 60 000 psi (4 100 bar)
Operating Temperature: −20 °F to +200 °F (typical elastomer range)

Installation & Maintenance
Depressurize System: Safely relieve pump pressure and drain fluid before disassembly.
Disassemble Piston Assembly: Remove the cylinder head and extract the piston per OEM service manual.
Remove Old Seal: Pry out the worn dynamic seal using a non-marring pick.
Inspect Components: Clean and inspect piston and bore for scoring; polish minor imperfections.
Install New Seal: Lubricate seal lip with pump oil, press into gland groove ensuring flush seating.
Reassemble & Test: Reinstall piston, cylinder head, repressurize slowly, and verify stable pressure under no-load conditions.