Product Name: Static Backup Ring (Part No. 300727)

Description:
The Static Backup Ring 300727 is a precision-engineered rigid ring specifically designed as a support component for O-rings and static seals in ultra-high-pressure waterjet pump and manifold assemblies . It is installed adjacent to a static O-ring within a seal groove, acting as an anti-extrusion barrier .

Manufactured from high-strength materials such as Copper Beryllium, PTFE (Teflon), or brass, this component provides exceptional mechanical stability, chemical resistance, and low friction performance . Under operating pressures up to 4,137 bar (60,000 PSI), the rigid backup ring fills the clearance gap between the O-ring and the gland wall, preventing the softer elastomer from being forced into these gaps and thus preventing seal failure .

The Static Backup Ring 300727 is an OEM direct replacement for OMAX (300727) and AccuStream (1-13152) waterjet systems . It is typically used in static sealing applications within intensifier manifolds, check valve housings, and the port adapter assembly (alongside Static Seal 300726 and Port Adapter 300729), where it maintains critical sealing integrity during pressure cycling .

Applications:

• Supports static O-rings in high-pressure waterjet intensifier pumps and manifold assemblies

• Prevents seal extrusion and deformation in check valve housings

• Maintains sealing integrity under extreme pressure cycles up to 60,000 psi

• Used alongside Static Seal 300726 and Port Adapter 300729 in port adapter assemblies 

• Compatible with OMAX, AccuStream, KMT, FLOW, WSI, and BFT waterjet systems 

Features:

• High-Strength Material: Manufactured from rigid materials (Copper Beryllium or PTFE) offering excellent mechanical stability and wear resistance 

• Precision Dimensions: Designed to exact specifications (0.8735 OD x 0.626 ID) for perfect fit in designated grooves 

• Anti-Extrusion Function: Provides a rigid mechanical barrier preventing soft O-ring material from flowing into clearance gaps under high pressure 

• High-Pressure Rating: Engineered for continuous operation at 60,000+ PSI (4,100+ bar) 

• Chemical Resistance: Resistant to water, hydraulic fluids, and common water treatment additives 

• Low Friction Performance: Smooth surface reduces wear and allows proper O-ring compression 

Maintenance:

When to Replace (Failure Diagnosis):

• External Water Leakage: Visible water weeping from the port adapter or manifold area indicates static seal failure, requiring immediate replacement of both the O-ring and the backup ring 

• Pressure Drop: Inability to maintain rated cutting pressure may indicate seal extrusion or backup ring deformation

• Visible Damage During Inspection: During maintenance, inspect the backup ring for signs of deformation, cracking, compression set, or edge damage

• Replace with O-Rings: The backup ring is a single-use component that should always be replaced simultaneously whenever the associated static O-ring is replaced 

Inspection and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system and follow lockout/tagout procedures

• Clean Installation: Thoroughly clean the seal groove and mating surfaces with a soft cloth. Remove all debris, old seal residue, and mineral deposits

• Lubrication: Apply manufacturer-recommended high-pressure grease (e.g., FML-2) to the backup ring and O-ring during installation to prevent pinching and ensure proper seating

• Groove Inspection: Inspect the groove for burrs, nicks, or sharp edges that could damage the backup ring or O-ring

• Orientation: Ensure proper orientation of the backup ring relative to the O-ring. The flat side typically faces away from the O-ring, positioned on the low-pressure side of the seal stack 

• Replacement Criteria: Replace the backup ring immediately if deformation, cracking, or compression set is detected. Do not reuse old backup rings 

• Cross-Reference Part Numbers: OMAX #300727, AccuStream #1-13152, WO300727, HWS# 45066, 1-11680-240