it is mostly used in high-temp hydrocarbons,thermal trasmission oil and high-temp chemical mediums. Application condition:With more than years of successful application in high-temp chemical flows and oil refining industry, high-temp welded metal bellow series are mostly used in high-temp hydrocarbons, thermal transmission oil and high-temp chemical mediums, and applicable for rotary shaft based equipments such as centrifugal pumps and gear pumps.Combination of materials:Pressure:≤20barTemperature: -75°C~~425°C                           -100°F~~800°FLinear speed: 25mps Features:Welded metal bellow wave pieces in lieu of springs as more balanced compensated parts has small radial size without blockage, can transmit particles with high viscidity and bigger proportion.Non-impellent secondary seals can avoid the abrasion of stationary seals on shafts or shaft covers and the pre-invalidation of secondary seals.The inner diameter of bellow wave piece has a 45° bevel, which is useful for avoiding concentration of stress thus prolonging the use life.Flexible graphite are used for the stationary seals instead of rubber pieces, boosting the temperature-resisting performance as high as 425°CThe sealing performances and tests of high-temp 69 series conform to C-level specification of AP1682 standard.