Holst a test valve and fix to the place, near its right flange end to the blind of right work bench, adjust right jaw to advisable position, press the button of "right jaw clamp" (enclosed graph) for gripping the right flange of tested valve. press the button of "frame onward", make the blind of left bench compacting left flange of valve, adjust left jaw to advisable position, press the button of "left jaw clamp" (enclosed graph) for gripping the left flange of valve. then respectively press "left jaw pressurization" and "right jaw pressurization" according to valve DN and PN increase to demanded pressure value corresponded to pressure check list (enclosed graph). high-pressure oil pump is used in gas drive-type, gas-driven through the "gas-driven regulating valve for high pressure oil pump