Application  

Single-eccentric butterfly valves are industrial valves, which are designed to fully open or close a passage of the working medium flowing through a pipeline. They can also be used for flow-control purposes. However, a 100% tightness of the valve cannot be guaranteed in a long-term use for control purposes. 

TDS

Working medium  

• waste and service water  
• drinking water  
• hot water  
• steam  
• non-aggressive liquids and gases  
• (natural gas, CO-gas, petroleum products, etc.)  

Butterfly valves is possible to deliver with surface protection which is done by coverage with plastic material (rilsan, halar). This surface protection together with the use of stainless steel material is widening the usage of butterfly valves for chemically aggressive or abrasive media and sea water.

Maximum working temperature:

• Maximum working temperature of the butterfly valve depends on the packing material used.  

Technical description  

• Single eccentricity (Fig. A) - the operating shaft axis is eccentric to the packing axis  

- easy replacement of gasket  

- gasket is not interrupted on the circumference by shaft  

• Disc is clamped on the operating shaft and pivot, which are pivoted in self-lubricated friction bearings (Fig. B).  
• Shaft is sealed by O-ring (Fig. B).  
• The pivot is sealed by flat gasket (Fig. C).  
• The sealing bears on the conical area of the seat, and is together with the disc pushed by the media pressure onto the conical seat, and by this is an absolute tightness reached (Fig. C). To see the tightness grade in the opposite direction please contact manufacturer.