19 1. The service life of the diaphragm is considerably extended 2. This results in reduced maintenance times and costs 3. Defined torques are specified for diaphragm changes 4. “Retightening” after diaphragm change (sterilisation) is not necessary 5. Increased operating pressures of up to 20 bar are possible 6. Increased operational safety 1.4 SISTO-C The unique SISTO sealing system SISTO diaphragm valves are characterised by an innovative sealing system that ensures optimum functionality and durability. In the following we explain the special features of this system. SISTO-C 1 1. Chambered diaphragm in the body - The diaphragm is chambered in the valve body, which enables an extremely reliable seal to the outside The chambering offers the following benefits: - Exact positioning of the diaphragm - Precise pressing of the diaphragm - Defined hygienic sealing for sterile processes - Prevents the diaphragm from creeping under the influence of temperature and time and provides reliable tightness over the service life - Protects the sealing surfaces of the body during installation and maintenance 2. Flexible, metal support spiral - Instead of a rigid compressor, the back of the diaphragm is supported by a metal spiral spring. This innovative and unique solution maximises the service life of the diaphragm, among other things - The back of the diaphragm is supported in every valve position, even in the open position. This ensures an even distribution of force over the entire surface 4. The bolt holes are located on a separate level, outside the sealing surface - This means that they do not represent a weak point in the sealing to the outside Benefits of this sealing system 3. Floating nut - The actuating force is applied via the compressor. The diaphragm bolt can give way. This helps to extend the service life of the diaphragm - Standardised fixing for all diaphragm types. The upper parts are suitable for use with all diaphragm types
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