Valve Disc Springs Data

In so far as base material is concerned, the data provided with these dimensions is only valid for SAE1075 and SAE6150 Spring Steel.

We have provided data which is somewhat different to that which other disc spring manufacturers provide. We feel this data is important and can save you lots of time. The following abbreviations are used in the Product Tables Below:

• D_i : Inner Diameter, D_e : Outer Diameter
• t is material thickness, whilst t´ is the reduced material thickness for a Group 3 Disc Spring with contact flats, so
• l₀, refers to the overall height of the disc spring and never changes (there is no ´ version), however
• if a calculation uses t then if t' is relevant, then this must be used instead, thus implicitly true for h'₀
• We provide the Group (1,2,or3)) as defined by the standard to help with tolerances
• and we provide the Dimensional Series as practically interpreted from the standard as well, also for tolerances
• The Force provided is that which corresponds to compressing the spring by 25% & 75% of its available travel or cone height
• We also provide the Operational Compression limit for Dynamic use as a % of s/h'0

We provide the following ratios:

1. h₀/t : Ratio of Cone Height to Material Thickness - determines shape of the load curve - linear to digressive
2. D_e/t : Ratio of Outer Diameter to Material Thickness
3. D_e/D_i : Ratio of Outer to Inner Diameter - very important for static set stress threshold at σ₁ max
4. These help derive the DIN value ie 16983 / Group / Series, otheresie bespoke