Pump Parts: Seals/Rings
Flow Parts
Back-up Ring -240
Back-up Ring -240
Part:A-00250-240
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The Back-up Ring -240 is a precision support ring used alongside O-rings in high-pressure assemblies to prevent extrusion, stabilize sealing, and extend service life. Proper installation is essential for performance. Always confirm that the dash size (-240) matches the O-ring used in the assembly. The back-up ring should be installed on the low-pressure side of the O-ring to guard the extrusion gap. Replace rings whenever the O-ring is changed, or if nicks and flattening are visible, to ensure long-term sealing reliability.
Related products:
- Back-Up Ring; HP Seal; 60K Intensifier (B-1465-1) — common back-up element in 60K seal stacks; replace with O-rings for balanced wear.
- HP Intensifier Seal Maintenance Kit 87K (012036-1) — includes key wear parts typically replaced with back-up rings.
- Seal Assembly Cartridge — 87K PH2 Intensifier (040015-1)
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