SISTO diaphragm valve type KB


The Sisto diaphragm valve type 20 with free passage has been developed for a wide range of fluids.


Areas of application

  • Industrial / process technology
  • Water treatment / waste water treatment
  • Power plant technology
  • Ore dressing

Typical media

  • Industrial water
  • Waste water
  • Acids
  • Alkalis
  • Sludges
  • Suspensions

Customer benefits

1.    Optimised long-term operation
The spindle protection integrated in the position indicator prevents contamination from the outside.

2.    Reliable operability
The spindle and all internal operating parts are not in contact with the medium.

3.    Smooth running
The axial bearing minimises the closing torques.

4.    Cleanliness of the flow medium
The absence of dead space ensures that the medium is kept clean and prevents deposits.

5.    Absolute tightness to the outside and in the passageway
The diaphragm seals hermetically to the outside, in the passage and the operating parts.

6.    Quick position control
The valve position is clearly indicated by a visual display and can be easily seen from adistance.

7.    Low flow resistance
Flow-favourable housing shape with free passage.

8.    High corrosion and abrasion resistance
High-quality linings offer safety and durability.


Product data Sisto-KB

  • Nominal sizes: DN15-200
  • Pressure class: PN10
  • Temperature range: -20°C to +140°C
  • Type: with free passage
  • Overall length: EN558 R1 (ISO 5752/1)
  • Body material: grey cast iron (5.1301), spheroidal graphite iron (5.3103)
  • Linings: IIR (butyl), NRH (hard rubber)
  • Coatings: ECTFE (Halar); Polyamide (Rilsan)
  • Diaphragm materials: EPDM; CSM; NBR; IIR;
  • Drive: manual, pneumatic, electric