... ,liquid sulfur dioxide ,propylene,propane,liquefied petroleum gas (LPG),dimethyl ether,normal butane,isobutane,butene, ... ethylene oxide5.Standard configuration: Safety valve, level gauge, pressure gauge, thermometer, emergency shut-off valve, valve boxes, fire extinguishers, fire star ... .5 GradeEmergency cut-off valve ModelQGJ43F-2.5-7/8Nominal diameterDN50(Liquid phase);DN25(Gas phase)Nominal pressure2 ...