In downstream oil and gas, LPG: valve normally in the open position which closes automatically in the direction of flow for which it is designed, when a predetermined limit (set flow rate) is exceeded as set by the manufacturer (footnote 11: PNS 05:2019) [Section 3.22, Rule 3, DTI Department Administrative Order No. 22-11, Series of 2022, The New Technical Regulation Concerning the Mandatory Certification of Liquefied Petroleum Gas (LPG) Pressure Vessels, Systems, Services and Ancillary Products]
