SPX Back-Up Rings for High-Pressure Homogenizers

SPX back-up rings are critical components in the sealing systems

of high-pressure homogenizers. Designed to support primary seals and prevent

extrusion under extreme pressure, back-up rings play a vital role in maintaining

machine reliability and operational stability.

BOS Homogenisers supplies high-quality SPX back-up rings for SPX, APV,

Gaulin and Rannie homogenizers. With over 75 years of experience in

homogenisation technology and a worldwide distribution network,

BOS Homogenisers ensures reliable spare parts supply for demanding

industrial applications.

What Are SPX Back-Up Rings?

Back-up rings are auxiliary sealing elements used in combination with

O-rings, packings and other primary seals. In SPX homogenizers, these

components operate in environments where pressures are extremely high

and mechanical loads are continuous.

The primary functions of SPX back-up rings include:

• Preventing seal extrusion under high pressure
• Supporting the structural integrity of primary seals
• Maintaining proper sealing geometry
• Reducing deformation of elastomer components
• Extending overall seal service life

Without properly specified back-up rings, sealing systems can fail

prematurely, resulting in leakage, contamination risks and unplanned downtime.

Applications in SPX Homogenizers

SPX homogenizers, including APV Gaulin and Rannie models, are used

in dairy, beverage, pharmaceutical, chemical and biotech industries.

These machines operate under high pressure and require robust and

precisely engineered sealing systems.

SPX back-up rings are commonly used in:

• Plunger sealing assemblies
• Liquid end cylinder blocks
• Hydraulic actuation systems
• High-pressure valve assemblies
• Pressure relief systems

Each back-up ring must match the homogenizer model, pressure rating

and process conditions to ensure reliable performance.

Engineered for High-Pressure Conditions

High-pressure homogenization subjects internal components to extreme

mechanical stress. SPX back-up rings must withstand:

• Continuous pressure cycles
• Rapid pressure fluctuations
• Thermal expansion and contraction
• Exposure to various process media
• Dynamic movement of adjacent components

Dimensional accuracy and material consistency are essential to prevent

seal extrusion and maintain long-term sealing performance.

SPX Specialist

BOS Homogenisers is a specialized supplier of spare parts for SPX,

APV, Gaulin and Rannie homogenizers. Our focused expertise in

homogenisation technology enables us to supply components that

meet strict industrial standards.

Our spare parts portfolio includes:

• SPX back-up rings
• O-rings
• Plunger rings
• Packing assemblies
• Plungers
• Homogenising valves
• Valve seats and sealing components

With more than 15,000 spare parts on stock, BOS Homogenisers

provides fast response times and short lead times worldwide.

Importance of Correct Back-Up Ring Selection

Selecting the correct SPX back-up ring is essential for maintaining

seal integrity and operational reliability. Incorrect dimensions

or material selection may result in:

• Seal extrusion
• Leakage and product loss
• Accelerated wear of primary seals
• Pressure instability
• Unexpected production stops

BOS Homogenisers assists customers in identifying the correct

back-up ring based on homogenizer type, configuration and

operating conditions.

Maintenance and Preventive Replacement

SPX back-up rings are typically replaced during preventive maintenance

or complete liquid-end overhauls. Timely replacement ensures stable

operation and reduces the risk of sudden failures.

Our technical specialists support maintenance teams with accurate

spare part identification, quotation and global logistics coordination.

Worldwide Delivery and Technical Support

Headquartered and manufacturing in the Netherlands, BOS Homogenisers

serves customers worldwide through a strong distribution network.

We provide:

• Fast international shipping
• Technical consultation
• Spare part identification support
• Reliable after-sales assistance

BOS Homogenisers – Your SPX Back-Up Ring Supplier

Founded in 1950, BOS Homogenisers has built a strong reputation

as a specialist in homogenizer technology and spare parts supply.

Our expertise in SPX, APV, Gaulin and Rannie systems makes us

a reliable partner for industrial customers.

If you are looking for a dependable supplier of

SPX back-up rings, BOS Homogenisers can

provide the correct spare part with technical expertise

and global reach.

Contact BOS Homogenisers today to request a quotation or

technical assistance for your SPX back-up ring requirements.

Related SPX Spare Parts

Looking for other SPX homogeniser spare parts? Browse our complete range of SPX replacement components:

• SPX Plunger Ring – Plunger wear rings
• SPX Cylinder Blocks – Precision cylinder blocks
• SPX Actuator Packings – Actuator sealing packings
• SPX Cylinder Block – Precision cylinder blocks
• SPX plungers – High-pressure plungers

View all SPX spare parts →

Compatible Alternatives from Other Brands

Looking for back up ring for other homogeniser brands? BOS Homogenisers supplies compatible replacements across all major brands:

Bos Homogeniser guide rings | Rannie back-up rings | Gaulin back-up Ring | APV back-up rings