ISO 2503:2009规定了单级或两级压力调节器的要求，没有用于连接到用于气瓶的流量计量装置 压缩气体高达300巴（30 MPa）， 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）， 用于焊接，切割和相关工艺。它不包括具有公称出口压力p2> 20 bar的压力调节器。 ISO 2503:2009还规定了单级或两级压力调节器的要求，该压力调节器带有用于连接到气瓶的流量计量装置 压缩气体或高达300巴（30 MPa）的混合物 二氧化碳（CO2）， 用于焊接，切割和相关工艺。使用这种设备的典型工艺有:钨惰性气体电弧焊（TIG），金属电弧惰性气体焊接（MIG），金属电弧活性气体焊接（MAG），等离子体电弧焊，管芯焊丝管芯 - 电焊和等离子切割。附录B给出了流量控制系统及其流量测量装置的实例

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 (CO2), for use in welding, cutting and allied processes. It does not cover pressure regulators having a nominal outlet pressure p2 > 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 (CO2), 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.