Type VMB - 50 seals are widely used in refining, petrochemicals and chemical industries. Static o-ring is used as a secondary member. The absence of dynamic o-ring prevents possibility of seal hang-up. Centroid loaded face design increases seal life by avoiding seal face distortion caused due to thermal expansion and also ensures optimum face flatness over a wide operating condition. As a standard, AM350 bellow cores are used. For chemical compatibility Alloy C-276 or Alloy 718 bellow cores can be used.
Metal bellows seal offer distinct advantages in high temperature application. A bellow core constructed by welding number of metal diaphragms together eliminates the need for springs, providing more flexibility to the seal face compensating for seal face wear.
