ARI-Armaturen UK’s latest range of Faba bellows-sealed valves, features three versions with more than 17,000 variants. All variants offer a100% tight shut-off. The tight shut-off is achieved by the marginal seat arrangement, which has several new features. The angle of the seat and the angle of the plug are slightly different, resulting in a very narrow sealing area. The narrow contact means that the force provided by the handwheel/spindle is concentrated over a very small area, resulting in very high sealing pressure. The fine thread on the spindle increases this force even further. The difference in angles and the high pressure means that any dirt that adheres to the seat is dislodged. To handle the high sealing pressure, high-specification materials have been used for the seat, plug and spindle throughout the Faba range. The Faba-Plus is designed for all standard applications and features a reinforced bellows welded to the stem rather than to the plug. The Faba-Supra I is for arduous industrial applications. The Faba-Supra C is specially designed for the chemical industry and again features a reinforced bellows welded to the stem of the valve and a two-bolt emergency gland design.