KSB SISTO-20 diaphragm valve
The KSB SISTO-20 diaphragm valve: a PN16 industrial valve with hermetic sealing, low maintenance and wide use in industry, water and chemical processes.
KSB SISTO-20 diaphragm valve: general features
The diaphragm valve KSB SISTO-20 is an industrial valve designed for safe and efficient fluid control in complex technical applications. Thanks to its design principle based on an elastic diaphragm, the valve provides a complete hermetic seal and full separation between the fluid and the valve's mechanical components.
In modern industrial systems, water installations, chemical processes and applications with aggressive media, equipment reliability is essential. Diaphragm valves are preferred because they reduce the risk of leaks, contamination and corrosion. The KSB SISTO-20 meets these requirements with a robust design tested to European standards.
The main benefit for the user is a long service life and minimal maintenance, because the fluid does not come into contact with the actuating mechanism. Choosing a PN16 diaphragm valve such as SISTO-20 means operational safety, lower costs and consistent long-term performance.
What a diaphragm valve is and how it works
Technical definition
A diaphragm valve is a type of control valve in which the fluid flow is regulated by deforming a flexible diaphragm. The diaphragm completely isolates the fluid from the moving parts, protecting the internal mechanism from corrosion and wear.
How the KSB SISTO-20 diaphragm valve works in practice
When the valve is actuated, the diaphragm is pressed onto the internal weir, stopping the flow, or released to let the fluid pass. The seal is hermetic both to the outside and internally, preventing leakage.
All functional parts are fully separated from the fluid by the diaphragm, which makes these valves highly reliable. The diaphragm is designed to withstand aggressive liquids, reducing the risk of contamination and damage to the valve body.
KSB SISTO-20 valve: technical overview
Design data and main features
The KSB SISTO-20 diaphragm valve is built to DIN/EN standards, ensuring compatibility and safe operation:
- Connections: flanged, threaded or welded
- Design weir, body with corrosion protection
- Supported and encapsulated diaphragm
- Position indicator with protection of the stem
- Nominal pressure: PN16
- Sizes: From DN15 to DN200
- Maximum temperature: up to 160 °C
- Minimum temperature: -20°C
Materials and available options
The valve body is available in nodular cast iron or stainless steel, depending on the application. Diaphragms can be made of EPDM or other engineering materials compatible with chemical fluids or high temperatures.
Advantages of the KSB SISTO-20 diaphragm valve for industrial applications
- Complete, reliable sealing
- Complete separation of the fluid from the mechanism
- High reliability and long service life
- “No dead volume” design, with no fluid build-up
- Low maintenance
- Compatible with water, technical gases, oils and chemicals
KSB SISTO-20 valve applications
The SISTO-20 diaphragm valve is recommended for:
- Water treatment plants
- Chemical and petrochemical industry
- Irrigation and mining
- Food and homogenisation processes
- HVAC and energy installations
How to select a KSB SISTO-20 diaphragm valve correctly
When choosing a PN16 diaphragm valve, consider the following criteria:
- Nominal size (DN)
- Fluid pressure and temperature
- Type of pumped fluid
- Connection type: flanged, threaded or welded
- Whether a pneumatic or electric actuator is needed
Available models and KSB SISTO technical documentation
The range of KSB SISTO diaphragm valves, which includes the SISTO-20, comprises several design variants for different requirements of pressure, temperature, connection type and field of application. These models are designed to DIN/EN standards and are available with different body and diaphragm materials, for general industrial applications, water treatment, chemical processes or media with special requirements. For each variant, KSB provides detailed technical drawings, datasheets, dimensional drawings and installation documentation, essential for selecting the right equipment and integrating it into the project.
SISTO-20 diaphragm valve FAQ
How does a diaphragm valve differ from a ball valve or butterfly valve?
Diaphragm valves offer better sealing and full separation of the fluid from the mechanism, which makes them well suited to aggressive media.
How do I choose the right material for chemical media?
By checking the chemical compatibility between the fluid and the diaphragm or valve body material.
Can the KSB SISTO-20 valve be automated?
Yes, the valve can be fitted with pneumatic or electric actuators.
What is the service life of the diaphragm?
It depends on operating conditions, but it is long thanks to the protection the valve design provides.
Why choose the KSB SISTO-20 diaphragm valve
The KSB SISTO-20 diaphragm valve is a reliable industrial solution, designed for tight sealing and safe operation in demanding applications. Its robust design, compatibility with aggressive fluids and low maintenance make it an excellent choice for modern systems.
Contact us for technical advice, request a quote or download the KSB SISTO-20 datasheet directly from the site.
