INTRODUCTION

  • A butterfly valve is a rotary motion valve that is used to stop, regulate, and start fluid flow.
  • Butterfly valves are easily and quickly operated because a 90o rotation of the handle moves the disk from a fully closed to fully opened position. Butterfly valve falls under the quarter turn category of valve.
  • Butterfly valves are available in 1 ½” to 24” size range with 150#, 300#, and 600#.

TYPES OF BUTTERFLY VALVE

butterfly-valve

WAFER TYPE BUTTERFLY VALVE

It is designed to maintain a seal against bi-directional pressure differential to prevent backflow in systems and to assure a one flow direction. A tightly fitting seal such as gasket, o-ring, precision machined, and a flat valve face on the inlet and outlet sides of the valve to prevent any leakage.

LUGGED TYPE BUTTERFLY VALVE

Lug-style valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a different set of bolts for each flange. This setup allows either side of the piping system to be disconnected without disturbing the other side.

APPLICATION

  • Butterfly Valves are generally specified for most air, gas, steam, and liquid applications. They offer an excellent, economically priced, positive shut-off valve for handling medium that are easily displaced by the valve disc as it closes.
  • Butterfly Valves are especially well-suited for the handling of large flows of liquids or gases at relatively low pressures and for the handling of slurries or liquids with large amounts of suspended solids.
  • Butterfly valve is applied in wide range of industries such as water treatment industry, chemical processing plant, and mining industry.