This Safety Valve is mounted on the liquid refluence pipeline of the pan pump's outlet of the liquified petroleum gas station,when front pump pressure exceeds the stipulated value,the valve will open automatically to returen the liquid safe so that ensures the safe operation of equipments and pipelines. The company produces more than ten kinds of products such as safety valve,butterfly valve,ball valve,gate valve,globe valve,and non-standard valve etc.,the specification of products is over 2000 kinds.And can design and manufacture products according to the standards of ANSI,API,DIN,BS,JIS and GB. The valves are mainly made of these materials such as WCB,WC1,WC6,WC9,ZGCr5Mo,ZG15Cr1Mo1V,CF8,CF8M,CF3,CF3M,12CrMoV,ZG1Cr18Ni9Ti,and ZG1Cr18Ni12Mo2Ti etc.,its drive means cover the manual,worm wheel transmission,electric,pneumatic,liquid drive,and electric & liquid linkage etc.,the normal pipe diameter is from DN 10-3000 to 1/2 inch.-40inch.,the work pressure is from 0.6-42.0Mpa to 150Lb-2500Lb,the work temperature is from -196-+700 C