BS EN ISO 17871 pdf free download
BS EN ISO 17871-2020 pdf free download.Gas cylinders — Quick-release cylinder valves — Specification and type testing.
4 Requirements
4.1 General requirements Quick-release cylinder valves shall comply with all requirements of ISO 10297, unless this document expressly allows differing requirements or stipulates additional requirements. It is the responsibility of the manufacturer to classify the type of the quick-release cylinder valve according to the definitions in 3.2 (type A) or 3.3 (type B, C, D, or E) and to declare if the quick-release cylinder valve is designed for intermittent or total discharge. For type A valves for auxiliary refillable propellant gas cylinders with a water capacity of not more than 1,5 l, and where each filling requires the replacement of the valve operating mechanism, the material requirements for the valve body given in ISO 10297:2014+Amd.1:2017, 5.2, do not apply because for such designs the neck of the cylinder acts as the valve body.
4.2 Differing/additional requirements
4.2.1 Valve connections Differing from the requirements given in ISO 10297:2014+Amd.1:2017, 5.4, if the valve filling connection is separate from the valve outlet connection, the relevant requirements for the endurance test of the separate filling connection closure device given in ISO 22435 shall be met, but the number of endurance cycles for the filling connection closure device shall be as specified by the manufacturer. For type A valves, if the non-return valve in the separate valve filling connection does not require to be replaced after each operation, it shall be subjected to a number of endurance test cycles to be specified by the manufacturer.
4.2.2 Resistance to mechanical impact Differing from the requirements given in ISO 10297:2014+Amd.1:2017, 5.5.2, quick-release cylinder valves need not remain capable of being opened for emergency venting purposes if the quick-release cylinder valve has a means of safely venting the gas contents. After the impact test, the securing arrangements used shall still ensure the quick-release cylinder valve does not open.
4.2.3 Valve operating mechanism Differing from the requirements given in ISO 10297:2014+Amd.1:2017, 5.6.3, the number of endurance cycles is given in Table 1.
4.2.4 Valve operating device The requirements given in ISO 10297:2014+Amd.1:2017, 5.7, are not applicable, except for the requirement for the handwheel diameter.
4.2.5 Leakage Differing from ISO 10297:2014+Amd.1:2017, 5.8, the total external leakage (if to be tested, see 4.2.9) shall not exceed 12 cm 3 /h.
4.2.6 Documentation
In addition to the requirements given in ISO 10297:2014+Amd.1:2017, 6.2, the manufacturer shall provide an operating instruction, including at least the following:
a) the valve type including explanation of the related restrictions for use [e.g. application(s) and number of permitted operations as well as information on replacement or reconditioning, if applicable];
b) the gases and extinguishing agents charged with compressed gases the valve is intended to be used with;
c) the valve test pressure (see 4.2.8) or information on the filling conditions (e.g. for fire-extinguishing agents charged with compressed gases: filling ratio, filling pressure and related filling temperature of compressed gas) to determine valve test pressure;
d) all applicable activation conditions (e.g. activation pressure range, forces, angle of rotation, current and/or voltage);
e) information on securing arrangements (see 4.2.11);
f) for quick-release cylinder valves with a non-return valve in the separate filling connection which will not be replaced after operation of the quick-release cylinder valve, the maximum permissible number of filling cycles which is equal to the number of endurance cycles (see 4.2.1).BS EN ISO 17871 pdf download.
