1.ISO 9000 certificate system 2.material:carbon steel,stainless steel 3.nominal diameter:20,25,32,40 AQF Pressure safety valve of accumulator is mainly used between hydraulic systems and the accumulator,for the purpose of safety,flow cut off and load relief. A safety ball valve maintain the set value of pressure in the system. when the pressure exceeds the set value,the safety and shut-off will ...