First, product performance and use: direct-acting relief valve can be used for small flow system as a safety valve. Second, the technical parameters: 1, pressure regulator type, adjustable handle, adjusting bolt locking adjustable handle and protective cover. 2, working pressure range: of NG10 NG6 from 20 NG25 and 30 direct-acting relief valve 1, P-type direct-acting relief valve to adjust the pressure to 2.5MPa. 2, the structure is simple, sensitive, and easy to produce vibration and noise at work. 3 in the structure of the pilot valve. 4, the spring hard. 5, no external control port.