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Butterfly Valves

Butterfly Valves

Butterfly valves are used to control and regulate or throttle the flow. They are characterized by fast operation and low-pressure drop. They require only a quarter turn from closed to full-open position. Butterfly valves are produced in sizes ranging from NPS 2 (DN 50) to over NPS 160 (DN 4000). They are usually manufactured in flanged, wafer, and lug, or single-flange-type designs. The welding-end style is a specially engineered valve for a specific application. Threaded-end, grooved-end, and shouldered-end butterfly valves are also available to satisfy the joint type selected for the piping system. Butterfly valves are produced with metal-to-metal seats, soft seats, and with fully lined body and disc. The soft seats permit bubble-tight shutoff and the full lining enhances erosion and corrosion resistance. Butterfly valves are suitable for low-pressure and low-temperature applications as well as high-pressure and high-temperature applications. The term high-performance butterfly valve is intended to signify their suitability for moderate- to high-pressure and temperature services. The butterfly valves have a low-pressure drop and high-pressure recovery factor. They are suitable for low-pressure drop applications. These valves are extensively used in large water transmission, distribution, and cooling water lines.

Advantages of Butterfly Valves

  • The Compact Design Requires Considerably Less Space, Compared To Gate, Globe, Or Other Valves.
  • Light In Weight.
  • Quick Acting; As A Quarter-turn Valve, It Requires Less Time To Open Or Close.
  • It Is Available In Large Sizes, Ranging From NPS 1¹⁄₂ (DN 40) To Over NPS 160 (DN 4000).
  • They Have Low-pressure Drop And High-pressure Recovery.
  • Provide Bubble-tight Service.

Disadvantages of Butterfly Valves

  • Throttling Service Is Limited To Low Differential Pressure.
  • Throttling Is Restricted To A 30- To 80-degree Disc Opening. Location Of Valve, Pipe Routing, Free, And Closed Discharge Are To Be Considered While Using A Butterfly Valve In A Throttling Application.
  • Cavitations And Choked Flow Are Two Potential Concerns.
  • The Disc Movement Is Unguided And Affected By Flow Turbulence.

Applications of Butterfly Valves

Concentric Or Low-pressure And Low-temperature Butterfly Valves, The High-performance Butterfly Valves, Cover A Wide Range Of Applications. These Applications Include:
  • Cooling Water, Air, Gases, And Other Similar Applications, Such As Fire Protection, Circulating Water, Etcetera
  • High-pressure And High-temperature Water And Steam Services.
  • Throttling Service Involving Low Differential Pressures, As In Cooling Water Or Air Supply Systems
  • Vacuum Service.
  • Corrosive Services Requiring Lined Valves
  • Instrument Root Valves Cooling Water And Feed Water Systems
  • Slurry And Similar Services

Reference Standard

  • Design & Manufacturing – API 609 cat, A/B , ASME B 16.34
  • Face to Face / End to End – API 609 , ASME B 16.10 , ISO 5752 Series 13, ISO 5752 Series 14
  • End Connection – ASME B 16.5 for Flanged End upto 24”(DN600)
  • ASME B 16.47 for Larger Sizes
  • Testing – API 598
  • Fire Test – API 607, API 6FA
  • Fugitive Emission Testing – MESC 77/312, ISO 15848
  • Material Conformance – NACE MR 01-75