Butterfly Valve

Butterfly valves are generally favored

because they cost less than other valve designs, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

A butterfly valve is from a family of valves called quarterturn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The “butterfly” is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

Wafer-Type Butterfly Valve

Wafer Type butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a lat valve face on the upstream and downstream sides of the valve.

Lug-Type Butterfly Valve

Lug Type butterfly-valve 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 separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.

Design Feature

  • The unique Center Line seat and disc design insures positive valve sealing while maintaining low seating torque.
  • All Center Line Butterfly Valve discs are precision machined to a half ball profile, providing a precise disc to seat relationship
  • Center Line’s cartridge style seat incorporates an elastomeric bonded to a phenol stabilizing ring, eliminating elastomeric movement and reducing seat tearing or fatiguing due to bunching.
  • Center Line’s basic three bushing design completely isolates the valve shaft from the body, resulting in increased control of the valve disc, lower valve seating torque, and longer valve life.
  • The Center Line cartridge seat has a much smaller mass of elastomeric than traditional boot seat designs, limiting seat swell and the accompanying variations in seating torque.
  • Concentric butterfly valves – this type of valve has a resilient rubber seat with a metal disc.
Type of Butterfly Valve: Range: Pressure Rating:
Center Disc 50 mm to 900 mm (2” To 36”) PN 10 / PN 16

End Connection type

Wafer End Connection
Flange End Connection
Lug Type End Connection

Operation Type

Gear Box Operated
Manual Handle Operated
Electrical Actuator Operated
Pneumatic Actuator & Cylinder Operated

Material of Constructions

Body Material: Disc Material: Seat Material:
Cast Iron / SG Iron / WCB / SS304 / SS316 / ASTM A 351 Gr. CF8 / ASTM A 351 Gr. CF8M Cast Iron / SG Iron / WCB / SS304 / SS316 / ASTM A 351 Gr. CF8 / ASTM A 351 Gr. CF8M NBR / NITRILE / EPDM / VITON / BUNA-N / SILICONE

Technical Detail

Design & Manufacturer Standard: Testing & Inspection Standard: Temp. Rating:
BS 5155 / API 609 / BS EN 593 / AWWA C 504 / IS 13095 EN 12266 Part-1 & Part-2
BS 6755 Part-1
API 598
up to 180˚

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