Standard_Parts_Catalogue

Page 902 | 3.1 Indexing, Locking, Blocking with Pins and Ball-Shaped Elements Stainless steel indexing plungers GN 8170 are intended for use in hygi- enic areas and meet hygiene requirements on the knob side (front hy- giene). Wipers between the knob and the guide as well as the sealing ring between the guide and the housing keep the locking mechanism on the knob side leak-tight. At the same time, the high surface quality (Ra < 0,8 µm) and dead-space-free mounting prevent dirt from adhering and facilitate cleaning. Indexing plungers with a rest position (Type C) are used for such applica- tions where the plunger has to stay in its retracted position. In that case, the knob is retracted and afterwards turned by 90°. A notch keeps the plunger in this position. Mounting holes and through-holes in the housing must be at a right angle, free of burrs and without a chamfer. This ensures that the sealing rings will function properly. The stainless steel indexing plungers GN 8170 are certified according to DGUV Test. Information • Stainless steel AISI 316 Plunger pin case hardened • Pressure spring Stainless steel AISI 316Ti • Seals, blue, FDA compliant Temperature resistant -25 °C to +110 °C - - Sealing ring H-NBR, hardness 85 ±5 Shore A H - - Wiper TPU, hardness 95 ±5 Shore A • All moving parts lubricated with FDA compliant grease • Load Rating Information → Page 2132 • ISO Fundamental Tolerances → Page 2151 • Elastomer Characteristics → Page 2158 • Stainless Steel Characteristics → Page 2166 • RoHS Specification 4 2 Type B Without rest position C With rest position 3 Coding FH Knob side in Hygienic Design (front hygiene) 1 d 1 Plunger f8 Bore H8 d 2 d 3 d 4 d 5 l 1 l 2 l 3 k A/F Spring load in N ≈ Initial End 6 35 M 12 x 1,5 18 22,8 6 12 49,8 29 14 20 36 8 35 M 16 x 1,5 18 22,8 8 12 54,3 29 14 22 32 1 d 1 2 Type 3 Coding 4 Material (sealing ring) How to order 1 2 3 4 GN8170-8-C-FH-H GN 8170 Stainless Steel Indexing Plungers Knob Side in Hygienic Design (Front Hygiene)