What does a cylinder cover back-up ring do?

It backs up the O-ring at the cylinder cover joint, preventing the O-ring from being squeezed out under pressure and helping the seal last longer.

What part number can it replace?

It is an aftermarket replacement for FMC Bean P514731. The part number is listed for cross-reference only.

Cylinder Cover Back-Up Ring 233

Cylinder Cover Back-Up Ring 233 — Cylinder Cover aftermarket replacement part

This is the cylinder cover back-up ring (size 233) used in the fluid end of FMC Bean L-series plunger pumps. Fitted alongside the cylinder cover O-ring, it supports the seal against extrusion under pressure so the joint holds up over service. It fits FMC Bean models L1114SC, L1118SC, L1122D, L1614SC, L1616SC, L1618SC and L1622HV. As an aftermarket replacement part, it can be used in place of FMC Bean P514731; the brand and part number are listed for identification only and do not imply original-manufacturer production.

What it is

A cylinder cover closes the outer end of the fluid-end cylinder, retaining pressure and providing access for liner and piston service.

Pump compatibility

L1114SC
L1118SC
L1122D
L1614SC
L1616SC
L1618SC
L1622HV

Specifications

Property	Value
Weight	0.00 lb (≈ 0.00 kg, converted)
Width	8.0 cm
Height	8.0 cm
Depth	0.4 cm

Manufacturer technical notes

Cylinder Cover Back-Up Ring 233 (SKU: P514731) Molded from PTFE-filled polytetrafluoroethylene, temperature resistance -200°C to 260°C, compressive strength ≥80MPa. API 7K certified for FMC BEAN mud pump cylinder cover sealing systems, Ra≤0.4μm surface finish, anti-extrusion design for high-pressure drilling applications。

Verbatim from the Dongli product page on dlhddrilling.com.

Replacement / interchange

Aftermarket replacement cross-referencing FMC Bean P514731.

FAQ

Which pumps does this back-up ring fit?: It fits FMC Bean models L1114SC, L1118SC, L1122D, L1614SC, L1616SC, L1618SC and L1622HV.
What does a cylinder cover back-up ring do?: It backs up the O-ring at the cylinder cover joint, preventing the O-ring from being squeezed out under pressure and helping the seal last longer.
What part number can it replace?: It is an aftermarket replacement for FMC Bean P514731. The part number is listed for cross-reference only.

Related parts

See all Cylinder Cover →

All brand names, model numbers and part numbers are used for identification and cross-reference only and do not imply original-equipment manufacture. This is an aftermarket replacement part.

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