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Ermeto accessories directly influence the sealing, assembly time, and service life of hydraulic and pneumatic connections. For pipe fittings of types EO and EO2, dimensional accuracy, material selection, and sealing technology determine whether piping systems function stably and with low maintenance under pressure. This text provides specific information on materials, designs, connections, and sealing variants, as well as practical application steps for correct selection and assembly.

Materials and Corrosion Protection

Ermeto fittings and associated accessories are typically made of brass, stainless steel (1.4301, 1.4404), or alloyed steel. Brass offers good machinability and electrical conductivity, is sufficient for many hydraulic applications, and is cost-effective. Stainless steel is recommended for corrosive environments, aggressive media, and elevated temperature requirements. Steel components are often supplied galvanically zinc-plated or phosphated; for long-term or outdoor applications, an additional protective coating or the use of stainless steel is recommended. Material selection also influences compatibility with seals: NBR seals are compatible with mineral oils and many hydraulic fluids, FKM (Viton) tolerates higher temperatures and aggressive media, EPDM is not suitable for mineral oil-based hydraulic fluids.

Designs and Dimensions

Ermeto accessories include nuts, cone pieces, sealing washers, sleeves, and protective caps. The designs are based on pipe diameters and thread types (metric, BSP, NPT in special cases). EO and EO2 differ in cone shape and insertion depth: EO is designed for smaller pipe cross-sections with a more compact cone, EO2 offers a larger cone angle and thus increased clamping force for thin-walled pipes. Critical is adherence to the insertion depth and clean deburring of the pipe ends; deviations lead to leaks even with correct seal selection. Tolerances in the outer diameter and wall thickness of the pipe are also important, as these influence the deformation during tightening.

Connections, Threads, and Sealing Systems

Ermeto systems work with form-fitting and force-fitting connection elements. The standard principle combines a conical pressing zone with a sealing washer or a fiber-reinforced sealing ring, whereby the tightening torque generates the plastic deformation of the pipe. For EO/EO2 accessories, connections are available in metric threads (e.g., M14x1.5, M18x1.5) as well as in 24° seats for flange adapters. For high-pressure applications, sealing washers made of softer material are useful to compensate for surface roughness; for dynamic loads, an elastomeric O-ring in combination with metallic pre-tensioning is preferable.

Sealing Variants and Temperature Ranges

Sealing materials must be selected according to medium, temperature, and pressure. NBR (nitrile) covers -30 °C to +100 °C and is suitable for mineral oils. FKM (Viton) functions up to +200 °C and resists fuel and chemical contact. PTFE seals offer chemical resistance and low friction but are less elastic and require precise surfaces. For applications with changing temperatures, elastomeric mixed seals with a metal carrier are an option, as they compensate better for thermal expansion. When ordering, pay attention to the specification for operating pressure and pressure surges, as seal selection and design are crucial here.

Assembly and Tightening Torques

Assembly errors are the most common cause of leaks. Preparation steps: deburr pipe end, check for burr-free cut surface, correctly position pipe sleeve, and inspect cone piece. Nut assembly is done in steps: center the parts with slight pre-tightening, then tighten further with a defined torque at an angle of 90°-120° until the recommended insertion depth is reached. Use torque wrenches and adhere to manufacturer specifications, as overtightening can burst the pipe wall and undertightening can create voids. For reusable connections, check for leaks after the first pressure build-up and again after thermal stress.

Practical Application — Structured Examples

Practical Example 1 — Hydraulic Unit in Production Machine: Install EO2 cone systems on a pump with 6 mm piping. Cut the pipe straight with a pipe cutter, deburr inside and out, slide on the sleeve, place the cone piece, and hand-tighten the nut. Set the pump to 50% nominal pressure, check the connection for leaks, then tighten the nut to the specified torque. After 24 hours of operation, check again and retighten by 1/8 turn if necessary. Use FKM sealing washers if the hydraulic fluid undergoes elevated temperature cycles. Practical Example 2 — Pneumatic Conveying Line in Paint Shop: For dry compressed air lines, the EO design in brass with PTFE sealing washers is recommended to avoid chemical attack on paint particles. Deburr pipe ends, slide on sleeve, insert cone, hand-tighten nut. Use a leak detection spray after pressure build-up to detect fine leaks early. During regular maintenance, check removed accessories for wear and replace sealing washers annually. Practical Example 3 — Chemical Transport in Laboratory System: Preferably use stainless steel 1.4404 and PTFE seals. Pay attention to compatible screw connections and use corrosion approvals for copper alloys. During assembly, ensure cleanroom conditions or a clean environment to avoid particles between sealing surfaces. After initial assembly, flush the line with the transport medium and perform a pressure test at 1.1 times the operating pressure.

Compatibility and Spare Parts

When reordering Ermeto accessories, serial numbers, thread dimensions, pipe outer diameter, and material characteristics are crucial. Universal parts often lead to fitting inaccuracies. Pay attention to original Ermeto spare parts or precisely compatible components with documented material data. Replacement seals should always be selected according to operating parameters (pressure, medium, temperature); mixed parts from different manufacturers can have unexpected material incompatibilities.

Logistics, Storage, and Handling

Store accessories dry, dust-free, and at a stable temperature. Do not store elastomeric seals exposed to UV and ozone. Check packaging for completeness, especially for kits with nuts, sleeves, and sealing washers. For larger orders, check batch markings to ensure interchangeability in the field.

Ordering Information

When ordering, be sure to specify: pipe outer diameter, wall thickness, thread type, desired material, medium, and temperature range. This is the only way to safely assemble suitable EO/EO2 components and seals. For detailed questions on material data sheets and application examples, please refer to further information under Technik and specific practical cases under Anwendungsbeispiele.

• Important ordering parameters: Pipe Ø, wall thickness, thread, material, seal type, operating pressure, temperature range

Maintenance and Service Life

The service life of Ermeto connections depends on operating cycles, vibration, temperature changes, and media-related corrosion. Visually inspect connections for lubricant film, discoloration, or corrosion spots and perform pressure tests at defined intervals. For vibrations, lock nuts or securing elements are recommended; in dynamic systems, seals with higher elasticity should be chosen. Replace seals preventively after specified operating times — this significantly reduces unplanned downtimes.

FAQ

1. Which seal is suitable for EO/EO2 fittings with mineral oils?
For mineral oils, NBR is the standard choice up to +100 °C; for higher temperatures or oil-contaminating additives, FKM is recommended. 2. Can EO2 components be combined with EO nuts?
Mixing is only possible if the cone shape, insertion depth, and thread dimensions match exactly; otherwise, leaks will occur. If possible, use the same design or check the manufacturer's compatibility data. 3. How do I know if a fitting is reusable?
Reuse is possible if there is no plastic deformation, no cracks, and the sealing surfaces are intact. Check the pipe wall, cone, and sealing washer; if in doubt, replace the seal and nut.