标准摘要
[中文适用范围]： 本国际标准规定了用于焊接、切割及相关工艺的气体钢瓶用单级或两级减压阀（不带流量计量装置）的要求，适用于压力高达 300 巴（30 MPa）的压缩气体、溶解乙炔、液化石油气（LPG）、甲基乙炔 - 丙二烯混合物（MPS）和二氧化碳（CO2）。它不包括标称出口压力 p2 > 20 巴的减压阀。本国际标准还规定了用于焊接、切割及相关工艺的气体钢瓶用带流量计量装置的单级或两级减压阀的要求，适用于压力高达 300 巴（30 MPa）的压缩气体或混合物以及二氧化碳（CO2）。使用此类设备的典型工艺包括：钨极惰性气体保护焊（TIG）、熔化极惰性气体保护焊（MIG）、熔化极活性气体保护焊（MAG）、等离子弧焊、药芯焊丝电弧焊和等离子切割。本国际标准不包括直接用于气瓶组的减压阀。此类减压阀应符合 ISO 7291 的安全要求，特别是氧气减压阀的绝热压缩试验。 [外文原描述]： ISO 2503:2009 specifies requirements for single or two-stage pressure regulators without flow-metering devices for connection to gas cylinders used for compressed gases up to 300 bar (30 MPa), dissolved acetylene, liquefied petroleum gases (LPG), methylacetylene‑propadiene mixtures (MPS), and carbon dioxide (CO 2 ) , for use in welding, cutting and allied processes. It does not cover pressure regulators having a nominal outlet pressure p 2 > 20 bar. ISO 2503:2009 also specifies requirements for single or two-stage pressure regulators with flow-metering devices for connection to gas cylinders used for compressed gases or mixtures up to 300 bar (30 MPa), and carbon dioxide (CO 2 ), for use in welding, cutting and allied processes. Typical processes using this equipment are: tungsten inert-gas arc welding (TIG), metal-arc inert-gas welding (MIG), metal-arc active-gas welding (MAG), plasma arc welding, tubular-cored-wiretubular-cored-wire welding and plasma cutting. Annex B gives examples of flow-control systems and their flow-measuring devices.
英文名称Gas welding equipment — Pressure regulators and pressure regulators with flow-metering devices for gas cylinders used in welding, cutting and allied processes up to 300 bar (30 MPa)