BS EN ISO 17871:2020 pdf free.Gas cylinders一Quick-release cylinder valves一Specification and type testing.
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 I, 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.Differing from the requirements given in ISO 10297:2014+Amd.1:2017, 5.4, if the valve flling 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.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.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.BS EN ISO 17871 pdf download.