Flanged version of a TRIODIS butterfly valve with a hydraulic actuator. (KSB Aktiengesellschaft, Frankenthal, Germany)
Flanged version of a TRIODIS butterfly valve with a hydraulic actuator. (KSB Aktiengesellschaft, Frankenthal, Germany)

KSB plans to present the valves at this year’s Achema, which takes place from 18– 22 June 2012 in Frankfurt, Germany.
 
The closing torque is lower than that of double-offset disc valve types, which makes the Triodis  valves suitable for use with smaller actuators. With their triple-offset design and tapered sealing surfaces, the valves ensure tight closure even at very high differential pressures. Sealing can be effected by means of Helicoflex seat rings.
 
The valves provide bidirectional shut-off and they do not require a travel stop for the closed position, because their metal seat forms a natural stop. This protects the valve seat should the actuator operate the valve in the wrong direction. The valve stem is a single-piece design supported by plain bearings and an additional anti-blow out device prevents the stem from being blown out of the body in the event of a failure.
 
Triodis butterfly valves are available with diameters ranging from 200 to 1200 mm. The stainless steel bodies can be supplied either with flanges or with butt weld ends. The series includes a special butt-weld side-entry version which serves to weld the valve into the piping. For maintenance the valve trim can be pulled out of the body without having to remove the entire valve.
 
The butterfly valve range has successfully passed the Fire Safe Tests to API (American Petroleum Institute) and BS (British Standard).