Stenso - Hovedkatalog 2019

Guide Ring The guide ring has a rectangular cross-section and is provided with a chamfer on all edges. Thus non-permissible edge pressures in the groove corners are avoided. The chamfer also serves to simplify assembly. Guide rings are basically preformed with a chamfered cut. The split m is specially taken into account to ensure safe function and undisturbed operation of the seal. Material Data Max. compressive strength static [N/mm²] 80 Max. compressive strength dynamic [N/mm²] 30 Materials Overview The material Wearite (glass fibre reinforced polyacetal) excels in wear resistance and high load bearing capacity over the entire temperature range of application. Good media compatibility and low frictional coefficient of the material make it suit- able for both hydraulics and pneumatics. Calculation Designing and sizing of wear ring for dynamic applications is dependent to a large ex- tent on the radial force and the associated deformation and strength of the material, wear rings cut length and service temperature. The value of the dynamic comp- ressive strength is to be considered, taking the above factors into account. It is ad- vantageous to include a factor of safety In accordance with above calculations, a choice can be made as 1 Guide rings for groove width of 9.7 mm (part N°. PWR 63/58x9,7-A 2 Guide rings for groove width of 5.6 mm (part N°. PWR 63/58x5,6-A To achieve as much of a sliding surface as possible, the use of two wear rings is to be recommended. Where: B = min. width of slide ring [mm] min F = max. radial load [N] R = permissible dynamic compression zul.dyn strength [N/mm²] S = safety factor D = nominal diameter [mm] n B min [mm] > .F S R . D zul. dyn. n Rod diameter D = 63 mm n Max. radial load F = 4 kN R dyn. compress. streng = 30 N/mm² zul.dyn Safety factor S = 2 B min 5,5 > 5000 ·2 30 . 63 Example: ~ 196 PWR, RWR Guide Rings