Order Parker Ermeto tube fittings with accessories

Order Parker Ermeto Tube Fittings with Accessories

**Ermeto tube fittings** stand for tight, permanently reliable tube connections in hydraulic and pneumatic systems. The range of accessories extends the function, ease of assembly, and durability of EO and EO2 systems and is crucial for the lifespan and operational safety of production facilities. This text provides technical details on materials, sealing concepts, designs, connection variants, and practical installation instructions, enabling you to precisely select and correctly assemble suitable components.

Materials and Surfaces - Selection Based on Operating Conditions

The fittings and accessories are typically made of tempered steel, stainless steel (1.4301/AISI 304, 1.4404/AISI 316L), or brass. **Tempered steel** offers high strength and economical solutions for non-corrosive environments. **Stainless steel** is mandatory for chemical exposure, seawater applications, or in the food and pharmaceutical industries. Brass components are used when good machinability and corrosion resistance to humidity are required. Surface coatings such as zinc-nickel, galvanic galvanization, or passivation increase corrosion protection and improve friction and assembly behavior.

Designs and Connection Variants of Ermeto EO / EO2

The EO and EO2 series offer various configuration options: straight fittings, 45°/90° elbows, T-fittings, reducers, hollow nipples, and multi-distributors. EO2 often differs by simplified assembly for larger tube diameters and improved molded parts for higher pressures. Connections are available in metric and imperial thread forms, as well as SAE or BSP variants for international interfaces. The internal geometry is optimized for minimal pressure losses; smooth transitions reduce cavitation and pressure peaks in high-pressure hydraulics.

Sealing Concepts and Leakage Prevention

Ermeto systems use torque-dependent cones and compression sealing surfaces in combination with form-fitting sealing rings to achieve a permanent seal without additional sealing compounds. Sealing materials include NBR, FKM (Viton), PTFE, and EPDM. NBR is suitable for mineral oils and hydraulic fluids up to approx. 100 °C. FKM offers resistance to higher temperatures and aggressive media. PTFE is chosen for chemical resistance and low friction; EPDM for water systems and steam. The correct selection of sealing material influences permissible temperature, media compatibility, and relaxation behavior under pressure. When selecting, ensure that the sealing temperatures, the medium, and the maximum operating pressure class match.

Mechanical Requirements: Pressure, Temperature, Vibration

Ermeto fittings are specified for a wide range of pressure areas. Standard versions cover common hydraulic pressures; reinforced designs and EO2 components are suitable for higher operating pressures. Temperature resistance results from the material and seal. Important selection criteria include static pressure load, dynamic pressure surges, and vibration load. To increase vibration resistance, locking washers, lock nuts, crimp sleeves, or compression fittings are used. Avoid combinations of soft seals and high vibration amplitudes without additional securing measures.

Assembly Practice: Tools, Torques, Sequence

For professional assembly, you need torque wrenches, tube cutters with deburrers, bending tools, and, if necessary, calibration or flaring tools. Cut tube ends at right angles, deburr inside and out, and check dimensional accuracy. The sequence for flange or distributor assembly influences tightness: always tighten lock nuts against the fitting, gradually retighten transitions with the specified tightening torque. Document tightening torques and seals used. For EO systems, the exact tightening values are stored in technical data sheets; deviations lead to leaks or material deformation.

Electrical Grounding and Potential Equalization

In conductive tube systems, the electrical connection can be interrupted by tube fittings. Check electrical continuity in systems with sensors or potential-critical applications. If necessary, use grounding bridges or conductive seals and ensure that connection surfaces are clean and free of coatings. In hazardous areas, additional measures for potential equalization must be considered.

Compatibility with Hydraulic Fluids and Lubricants

Ermeto components are compatible with mineral oil-based hydraulic fluids, synthetic ester oils, and semi-synthetic media, provided that the seal selection and material are coordinated. For biodegradable hydraulic fluids (e.g., RME, HETG), materials with extended chemical resistance must be chosen. For air, gases, or food contact, additional quality and hygiene requirements apply; in such cases, stainless steel and FDA-compliant seals are recommended.

Application Cases and Structured Practical Examples

**Example 1 — Repair of a Hydraulic Press:** In a workshop with moderate corrosion, the hydraulic press was converted to EO2 stainless steel fittings. Procedure: remove tube section, clean and calibrate tube ends, mount new EO2 molded parts, insert FKM seals, follow tightening sequence according to data sheet. Result: Leak test after 48 hours showed no leakage despite 250 bar operating pressure. Long-term benefit: reduced downtime and simplified spare parts situation. **Example 2 — Prototype System with Aggressive Media:** A chemical laboratory implemented an experimental line with resistant materials: stainless steel 1.4404 and PTFE seals combined. Assembly: controlled torque values, use of crimp sleeves for vibration damping, electrical grounding via separate bridge. Result: secure line routing for corrosive media and temperatures up to 120 °C. **Example 3 — Retrofit in a Packaging Machine:** For fast cycling, fittings with additional securing against torque loss were used. Procedure: selection of commercially available EO distributors, assembly with locking plates and counter-tightening, testing for dynamic load. Result: reduction of leaks due to vibration frequencies and extended service intervals.

Accessory Categories — Precise Application Notes

Select accessories by function: sealing rings for media sealing, crimp and compression sleeves for vibration-resistant connections, retaining rings and lock nuts for highly dynamic loads, adapters and reducers for interface adaptation, bending sleeves and protective sleeves to minimize bending radii. Use only original, matched accessories for EO/EO2 systems to avoid material and seal incompatibilities. Technical information and material data sheets can be found at https://maku-industrie.de/technik. * Typical accessories: seals (NBR, FKM, PTFE), crimp sleeves, lock nuts, locking plates, grounding bridges, bending sleeves, adapters (metric/imperial), molded parts (T/ L/ X)

Maintenance, Testing, and Spare Parts Strategy

Plan regular visual and leak tests. Cracks, corrosion on thread supports, deformations, and hardening of seals are reasons for replacement. Keep critical spare parts in stock: seal kits, lock nuts, and standard molded parts in the most common tube dimensions. Perform a pressure test with documentation after each repair. For recurring leaks, analyze assembly protocols for tightening errors, incorrect seals, or material defects.

Standards, Test Procedure Notes, and Documentation

Observe relevant standards such as DIN, ISO, and, if applicable, SAE or BSP specifications. Document material certificates, pressure and leak tests, and assembly protocols. For safety-critical applications, test intervals and test methods (pressure drop test, leak detection spray, vacuum test) must be bindingly defined.

Procurement and Interfaces

When ordering, pay attention to exact article designations (e.g., Ermeto EO/EO2, nominal size, material, seal type, thread form). Use drawing specifications or bills of materials to avoid incorrect orders. For system integration and application examples, visit https://maku-industrie.de/anwendungsbeispiele or the technical section at https://maku-industrie.de/technik.

3 FAQs

**1. Which seal is suitable for mineral oil-based hydraulic fluids?**
For mineral oil-based hydraulic fluids, NBR is the standard choice up to about 100 °C; for higher temperatures or more aggressive additives, FKM is preferable. **2. When should I choose EO2 instead of EO?**
Choose EO2 for higher pressure requirements, larger tube diameters, or when simplified assembly and better vibration resistance are required. Check the pressure class and approvals in the technical data sheets. **3. How do I prevent leaks due to vibration?**
Use crimp sleeves, locking plates, counter-tightening nuts, suitable sealing materials, and documented tightening torques. Additionally, a test for resonance frequencies of the line may be necessary.