- 1 - 2nd Edition No. SS2-BSL100-0100 Bellows Seal Bonnet for CV3000 Control Valve OVERVIEW The bellows seal bonnet for CV3000 series control valves prevents fluid leakage from the control valve gland. It is ideal for applications where leakage must be prevented --- such as those involving toxic, flammable, or odiferous liquids --- and for applications requiring a high degree of vacuum. FEATURES . Three bellows options are available: Formed type I, Formed type II, and Welded type. This allows selection of the most suitable bellows, taking into consideration the temperature and pressure of the process fluid and the required lifespan and cost of the bellows. . The 3 bellows options are interchangeable as long as the valve size is the same. By changing the bellows, it may be possible toachieve a longer product life or greater cost-effectiveness. . The bonnet has a leakage detection hole. By connecting an appropriate pressure sensor or gas detector, damage to the bellows can be detected. . For the formed bellows, buckling prevention during contraction and a uniform contraction volume are achieved by having the bellows guide integrated with the bellows ring. In addition, all 3 bellows types incorporate an antitwist prevention measure in the form of a rotation prevention pin. These measures prevent damage to the bellows in the course of expansion and contraction, so that long-lasting seal performance is maintained. 8 4 Specifications are subject to change without notice. “This product is designed for general industrial use.”