Merkel U-Ring Seal Set 0217

Product catalog summary

Product Description
The Merkel U-Ring Seal Set 0217 is a two-piece seal set designed for hydraulic and pneumatic applications. It consists of an elastomer U-ring with a sealing edge and fabric reinforcement, along with an active back-up ring to prevent extrusion.

Product Advantages

Single-acting piston seal suitable for hydraulics and pneumatics.
Low friction due to fabric reinforcement.
Available in a large range of dimensions.
Activated back-up ring prevents extrusion.

Materials

U-Ring: NBR U-ring 80 NBR B246, Cotton fabric BI-NBR B4 B248.
Back-up ring (<300 mm): Polyacetal POM PO202.
Back-up ring (>300 mm): Polyamide PA 6.G200.
Other materials like PTFE bronze back-up ring available on enquiry.

Operating Conditions

Running speed: 1.5 m/s.
Pressure (Pneumatic): 5 MPa.
Pressure (Hydraulic): 25 or 40* MPa.
Temperature range varies with medium, e.g., Hydraulic oils: -30°C to +100°C.

Design Notes
Design considerations include surface quality, tolerances, and gap dimensions. The largest gap dimension on the non-pressurized side is crucial for seal function.

Fitting & Installation
Proper fitting is essential for seal functionality. Refer to the Technical Manual for detailed instructions.

Surface Quality

Sliding surface: Ra 0.05 to 0.3 µm, Rmax ≤2.5 µm.
Groove base: Ra ≤1.6 µm, Rmax ≤6.3 µm.
Groove flanks: Ra ≤3.0 µm, Rmax ≤15.0 µm.

Tolerances
Nominal diameters and tolerances are specified, with considerations for guide play and deflection under load.

Catalog excerpts

Hydraulic Seals | Piston Seals | Merkel U-Ring Seal Set 0217 Merkel U-Ring Seal Set 0217 Operating conditions Fabric Back-up ring * max. pressure depends on the profile. Medium/ Temperature Product description Two-piece Merkel seal set comprising an elastomer U-ring with an elastomer sealing edge, a fabric reinforcement on the contact area and an active back-up ring. Single-acting piston seal for use in hydraulics or pneumatics HEPG (glycol) Product advantages HEES (synthetic ester) Mineral greases Design notes Low friction due to fabric reinforcement Large range of dimensions Activated back-up ring prevents extrusion Please observe our general design notes in ➔ Technical Manual. Surface quality Peak-to-valley heights Groove base Groove flanks Pneumatic applications Sliding surface Percentage contact area Mr >50% to max. 90% at cutting depth c = Rz/2 and reference line C ref = 0%. Material U-Ring Admissible gap dimension Material Cotton fabric The largest gap dimension occurring on the non-pressurised side of the seal in operation is of vital importance for the function of the seal. ➔ Technical Manual. Tolerances Other materials like PTFE bronze back-up ring on enquiry. The admissible gap width, tolerances, guide play and deflection of the guide under load are to be taken into account when designing d2. ➔ Technical Manual. Nominal Ø D Fitting & installation Careful fitting is a prerequisite for the correct function of the seal. ➔ Technical Manual. © Freudenberg Sealing Technologies GmbH & Co. KG | Seals for Fluid Power eCatalog 2014

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Merkel U-Ring Seal Set 0217

Merkel U-Ring Seal Set 0217

Catalog excerpts

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