The KSB SISTO-20 is a flanged type Diaphragm Valve with shut-off and sealing to atmosphere by a completely enclosed spiral-supported diaphragm. The KSB SISTO-20 comes with a position indicator with integrated stem protection. All the moving parts are separated from the fluid by the diaphragm, making the KSB SISTO-20 maintenance-free.
| Body design: | Straight pattern body |
| Bonnet design: | Bonnet |
| Coating: | Yes |
| No dead volume design: | Yes |
| Handwheel movement: | Rising |
| Lining: | Yes |
| Valve disc/plug material: | Soft seat |
| Threaded-end design: | Flange design |
| DN max.: | 200 |
| DN min.: | 15 |
| Body material: | Modular cast iron, Cast stainless steel |
| PN max.: | 16 |
| Max. temperature: | 160°C |
| Min. temperature: | -10°C |
| Body/bonnet seal element: | Supported and enclosed diaphragm |
Chemical industry, aggressive fluids, operating reliability
KSB’s pumps and valves contribute to reliability and progress
The KSB brand stands for top quality. Its products ensure smooth production processes, thus contributing to reliability and progress in the chemical industry. 
