BS EN ISO 8659:2020 pdf download.Thermoplastics valves – Fatigue strength – Test method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal pressures — Part 1: Metric series
ISO 16135, Industrial valves — Ball valves of thermoplastics materials
ISO 16136, Industrial valves — Butterfly valves of thermoplastics materials
ISO 16138, Industrial valves — Diaphragm valves of thermoplastics materials
ISO 16139, Industrial valves — Gate valves of thermoplastics materials
ISO 21787, Industrial valves — Globe valves of thermoplastics materials
3? Terms? and? definitions
For the purposes of this document, the terms and definitions given in ISO 161-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
6 Test report
The test report shall include at least the following information:
a) a reference to this document, i.e. ISO 8659, and to the product standard;
b) a complete identification of the valve, giving the following information:
1) the type of valve (ball, butterfly, diaphragm, gate and globe) according to ISO 16135, ISO 16136, ISO 16138, ISO 16139, ISO 21787,
2) the material of the valve body,
3) the nominal size (DN) and the socket diameter or spigot diameter,
4) the nominal pressure (PN) of the valve,
5) the manufacturer's name or trade mark,
6) the type of pipe used,
7) if necessary, the flow direction,
8) the closing torque,
9) the opening torque;
NOTE The opening torque is generally higher in ball, butterfly and gate valves as it is influenced by the wear between obturator and seats and by the maximum pressure difference between upstream and downstream side of the valve; the opening torque is lower in diaphragm and globe valves as the upstream pressure, acting on obturator, reduces the effort exerted to operate the valve.
c) a description of the test conditions;
d) the number of specimens tested;
e) whether the valve complied with the test requirements [if the valve failed (leakage or fracture)
indicate under what conditions it failed];
f) any operation not laid down in this document, or other occurrences which may have affected the test results;
g) the date of the test.BS EN ISO 8659 pdf download.