Metal bellow mechanical seals DY706 can be used in fluids,such as,Oil,light hydrocarbon,aromatic hydrocarbon, organic solvents,weak acids, alkali,Ammonia,etc.and the temperature from minus degrees 75-400,the pressure is less than 2.0 Mpa(Single bellow)and less than 6.0Mpa(Double bellows) and the pump shaft speed is 23m/Sec at maximum.