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Flowtorq Engineering
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Butterfly Valves | API 609 | ASME B 16.34

Butterfly Valves - API 609, BS 5155, ASME B 16.34, ISO 5752

Flowtorq Engineering is best manufacturer of butterfly valves. Butterfly valves are mainly used to shutt off, distribute and change the direction of fluid medium flow in pipeline. Sometimes butterfly valves are used for flow regulation and control. Similar to Ball valves, butterfly valves are generally quarter turn operated valves, i.e. needs to be operated with a rotation of 90 degrees and a small turning torque to close tightly. These valves are operated by lever, Gear operated handwheel or pneumatic / electric actuators. The body is usually very short in running lenght as compared to other types of valves and is usually through in cross sectional area. This body cavity provides a direct flow path with little resistance for flow and very little pressure drop. Butterfly Valves are designed as per BS 5155, API 609, ASME B 16.34 and ISO 5752 standards.

flanged butterfly valve

Function

Butterfly valves are widely used for ON-OFF duty and sometimes for flow regulation as well. Due to its compact design, these valves provide little or no flow resistance and is helpful in minimising pressure drops and losses. The size of the flow path generally constant in a linear manner throughout body and disc. This means that the flow rate does not change at any given point, provided the valve is full open. This results into low pressure drop and flow reduction. Butterfly valves have a variety of configurations and type typically centerline / centric design, double eccentric (doube offset) and triple eccentric (triple offset) types. In addition, several customisations can be done as per process requirements, applications, etc. 

Operation

Similar to ball valves, Butterly valves (BS 5155, API 609, ASME B 16.34 and ISO 5752) are operated by a rotating a lever or gearbox connected handwheel coupled with stem that is fixed to the disc inside body of valve. They are characterised as quarter turn valves. The stem is rotated 90 degree and the valve is thus operated, providing a visual indication of valve position as well. Sometimes actuators is attached to the stem on top so that it rotates the stem to operate the valve. The actuator are often are coupled into the stem from top. They may have a pointer over the actuator indicate valve position. Butterfly valves may have flanged ends drilled according to pipeline-compatible flange dimensional standards, wafer type without flanges or lugged type to suit appropriate flanges. Butterfly valves are typically constructed from dusctile iron, cast iron, cast carbon steel, stainless steel, alloy steels, etc. For flow regulation, actuators are usually used with positioners to control flow accurately. Flow control is usually calculated and termed as 'Valve CV' also known as 'Co-efficient of Flow Value". 

triple offset

Construction of API 609 Butterfly Valves

Centerline Type

Butterfly Valves of centerline type or concentric types are having stem axis perpendicular to body axis with no offset distance. This is the most commonly used type as API 609. 

Double Eccentric (Double Offset)

Unlike concentric or centerline butterfly valve, The stem and disc are having offset distance on 2 axes. This ensures higher performance than centerline type. 

Triple Eccentric (Triple Offset)

Formore high pressure, temperature and critical applications, triple offset type butterfly valves are used. The disc, Stem are having offset in 2 axes and the third axis offset comes in the form of cone originating parallel to body plane. This ensures tight sealing on the seat surfaces. 

Seats

As per the application, butterfly valves seats are carefully selected either in completely soft seat, completely metal seat and fire safe seats which are soft seating surface as primary and metal sealing surface as a secondary. These seats are selected based on applications by process engineers and engineering consultants. In centerline type, Soft Seats are fully lined and moulded inside butterfly valves body. Whereas in double offset and triple offset types, seats are usually fixed with retainer rings fastened to body.

Applications

Industrial applications such as oil and gas, petrochemicals, chemical, power generation, mining and industries use this valves. What makes this useful is that its simple operation and its ability of flow control in addition to on-off duty. There is also a pre calculated pressure drop and flow CV calculation which is as per the flow requirements of process.

  • wafer type butetrfly valve
  • double offset butterfly valve
  • pneumatic actuator butterfly valve
  • api 609 butterfly valve
  • flange api 609 valve
  • lug type api 609 valve

Why Select and Use Flowtorq API 609 Butterfly Valves ?

 

  • Easy Availibility 
  • Less Weight and compact construction
  • Wide range of application range with respect to temperature and pressure
  • Zero leakage ability
  • Fire Safe design availability
  • Economic Cost
  • Wide Range of Size from 1/2" (half inch) to large sizes till 40" inches or above
  • Easy Operation
  • Easy Maintenance and handling
  • Light but strong Construction
  • Wide Variety of internal trim parts variants
  • Long Service Life
  • Can be used for flow control and ON-OFF as well.

 

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aluminum bronze valve

Butterfly Valves General Specification

  • Size Range – 1/2″ to 40″ and above

  • Centerline Type, Double Eccentric (Double Offset), Triple Eccentric (Triple Offset) Types 

  • Pressure Rating – 150#, 300#, 600#, PN 10, PN 16, PN 20, etc.

  • Certifications – CE, ISO, etc.

  • Inspected & Witnessed By third party agencies

  • API Valves, ATex Valves, CE Valves, Process Valves, Gas Valves, Water Valves, Cryogenic Service, Fire Safe

Butterfly ValveAPI 609 Specifications
Steel / Iron Butterfly Valves 150# to 600#
Materials

  • Carbon Steel - WCB, WCC

  • Cast Iron, Ductile Iron, Grey Iron

  • Stainless Steel - CF8, CF8M, CF3, CF3M  

  • Alloy Steel - WC6, WC9, WC12

  • Brass 

  • Bronze

  • Aluminum Bronze

  • Duplex and Super Duplex - CN7M, 4A, 6A, 5A

  • Hastelloy ad other grades - HAstelloy, Monel, etc.

Trims

  • Disc - Carbn Steel, SS304/L, SS316/L, Duplex, Monel, HAstelloy

  • Stainless Steel for Disc, Stem and seat retainer rings

  • Seats - EPDM, NITRILE, PTFE, RTFE, PEEK, NYLON, TEFLON, VITON, etc.
  • Metal Seated - SS + Tugsten Carbide coating (TC), Stellited ST6
  • Other Trim as per Client requirement
End Connections

  • Flanged

  • Wafer

  • Lug Type (Semi Lug and Full Lug)

Accessories

  • Limit Switches

  • Position Indicators

  • Gear Operated Handwheel

Standards

  • BS 5155, ISO 5752, API 609, ASME B 16.34

  • API 598 / BS 12266-1 / FCA

  • Other End User Standards

Operation Type

  • Hand Lever Operated

  • Gear Operated

  • Electric Actuator Operated

  • Pneumatic Actuator Operated

  • Motorized (Electric)