Butterfly Valve Wafer Type Class 150


Soft seated butterfly valves are designed for general applications such as on-off, throttling and isolation in residential, commercial and industrial piping systems. They are well suited for control of wafer, steam, air, oil and gases. The seat design is especially well suited for vacuum service to 28” Hg and high velocity service


∙ The dual durometer seat is made of a highly wear resistant elasto- mer with phenolic back up ring. This combination provides a soft, elastic seat which will not collapse under vacuum or high velocity service and eliminates the need for flange gaskets. The stem seals consist of primary seal between the spherical disc hub and the spherical seat hub. The secondary seals are O-ring at the top and bottom of the stem to retain lubrication and prevent atmospheric corrosion. The one piece stem is blowoff proof.
∙ These valves can be funished in variety of trim materials. Ten posi- tion handles are available for manual operations as well as a gear operator with handwheel. Pneumatic hydraulic or electric actuators with solenoids, posioners and limit swithches can be specified for automated operation.

∙ ISO mount on 2”-36”. Double shaft on 2”-8” Keyed shaft on 10”-36”


∙ Temperature limitations are dependent on seat and body materials and service conditions. For throttling service, line velocity should not exceed 20 ft/sec (6m/sec) for liquid and 15,000 ft/min (4,500 m/min) for gases. Corrosive media applications depend on trim materials selected.


∙Individually Hydrostatically Tested


Body Cast Iron A126 Gr.B, Ductile Iron A536
Stem 416 SS
Seat EPDM, Buna-N, NBR, PTFE
Disc Aluminum Bronze, Ductile Iron, Stainless Steel