Metal bellow seals are constructed by welding a series of diaphragms together. The bellows unit remove the blocked condition for spring and provides flexibility to the seal face in addition to improve the seal face wear.
Used in water and weak corrosive liquid with SUS316 or SUS316L. With Hastelloy-C, can work smoothly in high corrosive liquid. Angle of bellows section is 45 degree to relieve stress and provide longer seal life. Used extensively in chemical industries, especially in high temperature environment. Enclosed grafoil ring and double nested bellows diaphragms.

Operation limit :
* Temperature: -75 °C - +350°C depending on material used
* Pressure: up to 300 psig
* Speed: up to 25m/s/4500 fpm