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HoseGuard Hose Burst Protection – Safe Pressure Relief for Media-Carrying Lines

HoseGuard hose burst protection prevents catastrophic pressure spikes and media release in the event of a hydraulic hose bursting or shearing off. The design aims for immediate pressure relief and mechanical securing of the line to protect machine functions, minimize employee risks, and reduce environmental release. The components are tailored to industrial requirements: targeted material selection, standardized connections, compact designs, and compatible sealing systems.

Function and Operating Principle

HoseGuard operates as a combined safety and relief unit. In normal operation, the line remains closed, and the flow characteristics are unaffected. In the event of a rupture or shear damage, an integrated shut-off or relief valve opens immediately and directs the excessive pressure in a controlled manner into a defined return line or a secured collection area. This prevents a pressure wave from affecting downstream components. Depending on the design, mechanical retaining clamps can additionally fix the sheared hose end, thus preventing further damage.

Materials and Corrosion Protection

For industrial applications, materials with high strength and resistance to hydraulic oils, coolants, and aggressive environments are necessary. Typical materials for HoseGuard include hardened steel for load-bearing elements, stainless steel (AISI 316) for corrosive environments, and aluminum alloys for weight-sensitive systems. Sealing contacts use elastomeric materials such as NBR, FKM (Viton), or EPDM, depending on the medium and temperature range. Surface treatments such as galvanic galvanization, nickel plating, or passivated stainless steel increase service life in humid or chemically stressed areas.

Designs and Sizes

Designs range from compact inline modules for direct mounting on the hose connection to modular units with an external relief tank. Depending on the pressure class and flow rate, various nominal diameters (e.g., DN6 to DN25) are available. The selection is based on nominal pressure (up to 400 bar and above), connection standard (metric thread, BSPP, ORFS), and space requirements. For rotating or swiveling applications, special swivel joints with an integrated HoseGuard module are available.

Connections, Interfaces, and Installation

Standard connections ensure easy integration into existing hose lines. Available connection types include metric cylindrical (ISO 6149), BSPP/BSPT, ORFS, and SAE flange adapters. Selecting the correct connection is crucial to avoid leaks and preload losses. Installation position and fastening should minimize tensile forces on the hose; rigid fastenings are replaced by flexible holders. During assembly, torque values for pre-assembly screws and correct sealing surfaces must be observed to ensure the safe function of the hose burst protection.

Seals and Media Compatibility

Seal selection depends on the medium, temperature range, and pressure cycle changes. NBR is cost-effective for mineral oils and moderate temperatures, FKM offers high resistance to synthetic and aggressive fluids, and EPDM is suitable for water and glycol. High-performance variants use polyurethane or PTFE backups for increased abrasion resistance and resistance to extrusion under high pressures. Seal packages are designed to absorb rapid pressure changes without protrusions or rollover, which increases service life.

Safety Aspects and Standards

HoseGuard products are designed according to relevant standards: guidelines for hydraulic components, machinery directives, and, where applicable, ATEX requirements for potentially explosive atmospheres. Lifetime tests, cyclic pressure load tests, and corrosion tests are part of the approval process. Safety redundancies are provided: double sealing levels, mechanical retaining elements, and clear pressure relief paths reduce single-point-of-failure risks.

Application Fields and Typical Use Scenarios

HoseGuard is used where hose failure has severe consequences: hydraulic units in presses, excavator hydraulics, industrial presses, conveyor systems, machine tools, and mobile working machines. In manufacturing, HoseGuard protects units and employees on peripheral devices such as clamping cylinders or grippers. In mobile applications, hose burst protection reduces the risk of oil leakage on inaccessible construction sites.

Practical Examples

Example 1 – Hydraulic Press in Metal Processing: In a 630-ton press, an inline HoseGuard unit is mounted on the cylinder connection. In the event of a hose rupture, the safety device immediately opens into a pressure buffer in the frame, the press stops via hydraulic control, and the cylinder remains depressurized. Result: Avoidance of cylinder damage, reduced downtime due to quick hose replacement.

Example 2 – Excavator Arm on Construction Site: A rotatable HoseGuard module is installed on the boom, preventing shearing by sharp edges. In case of damage, the hydraulic oil is diverted into a protected tank, preventing environmental damage and protecting operating personnel. The modular design allows for quick on-site replacement.

Example 3 – Machine Tool with Clamping Systems: For clamping cylinders in a CNC machine, a compact hose burst protection unit protects the grinding axes. In the event of pressure spikes, the valve directs the fluid into an internal reservoir area. Precise control allows continued operation with reduced power until a planned replacement is possible, minimizing production stoppages.

Maintenance, Inspection, and Replacement Intervals

Regular visual inspections of connecting elements, sealing surfaces, and fastenings are mandatory. Pressure and leakage tests at planned intervals, documented cycle tests during intensive use, and replacement of seals according to manufacturer specifications or at the first signs of wear are recommended. Spare parts should be equivalent in material and specification. For critical applications, a pre-planned replacement concept with defined stock levels of replacement modules is advisable.

Selection Criteria – Briefly Summarized

• Nominal pressure and flow rate, connection type, medium, operating temperature, space requirements, and required standard compliance.

Integration into Manufacturing Systems

When integrating into production lines, coordination with the control system and safety concept is important. Haptic or electrical feedback contacts on HoseGuard modules provide diagnostic information to the machine control and enable automated shutdowns upon activation. Additionally, mechanical protective covers and targeted cable routing are recommended to prevent external damage. For detailed technical data and compatible components, please visit our technical page: https://maku-industrie.de/technik and practical examples at https://maku-industrie.de/anwendungsbeispiele.

Compatibility with Functional Fittings

HoseGuard is designed for direct connection to functional fittings. Interface coordination prevents dead spaces and ensures secure seals. When used with quick couplings or rotating joints, the sealing material combination must be checked to ensure material compatibility and service life.

Procurement and Documentation Notes

When purchasing, pay attention to test certificates, material certificates, dimension drawings, and exploded views. Serial numbers and test run protocols facilitate maintenance and traceability. For projects with high safety requirements, we offer customized documentation packages and design support.

FAQ

1. How do I choose the right HoseGuard size for my system?

Choose based on the maximum operating pressure, flow rate, and hose nominal diameter. Consider the connection standard (metric, BSPP, ORFS), temperature range, and the medium. If unsure, system measurement protocols provide the basis for decision; technical consultation can create a suitable design based on this data.

2. Which sealing materials are suitable for high-temperature hydraulic fluids?

For high temperatures and aggressive hydraulic fluids, FKM (Viton) and PTFE-based sealing solutions are most suitable. EPDM is not suitable for mineral oil-based media. The final choice depends on the temperature range, media resistance tables, and cycle load.

3. Are HoseGuard modules service-friendly and replaceable?

Most inline and modular HoseGuard variants are designed for replacement without extensive disassembly. Pay attention to accessible fastening points, standardized seal kits, and driven connection nuts. Observe tightening torques and installation positions according to manufacturer specifications.