Butterfly valves belong to the family of quarter-turn rotational valves, created and first used in steam engine prototypes as early as the 18th century. Use of butterfly valves grew in the 1950s for applications in the oil and gas market, and 70 years later they continue to be widely used in numerous industrial applications.
Butterfly valves can be assembled with handles, manual gears, pneumatic or hydraulic actuation. The valve configuration consists of a stem and disc that rotate 90° from open to close in the clockwise direction. Butterfly valves are popular in many applications as they are cost effective to maintain, offer fast operation and are lightweight compared to other types of valves. Most butterfly valves use the same basic configuration, with a body, stem, disc, seat and stem seal; however, other parts may vary between the different butterfly valve types, such as resilient seated, lined, single offset, double offset (often referred to as high performance) and triple offset. These types are differentiated by the geometry of the disc, stem, seat and the material of the seating designs.
A key advantage of selecting a butterfly valve is the reduction of space and weight to a system compared with other options such as ball, check, globe or gate valves. Compared to a gate valve, installation of butterfly valves is less difficult from size and weight, and compared to ball valves, the cost to replace or repair is usually less. Butterfly valves are limited based on their application as they have an obstructed port, as part of the disc always faces the flow even when fully opened and they are not typically utilized in heavy slurry applications as a knife gate or severe service ball valve is preferred. Butterfly valves are also versatile products that can be used in both isolation and light control/throttling services.
RESILIENT SEATED CONCENTRIC
Resilient seated valves are concentric with the pipeline, as the disc is held in the center of the valve. This valve type is position seated, with continuous disc-to-seat interference. Ratings are commonly in cold working pressure (CWP) rather than class rating but fit between ASME Class 125 and Class 150 flanges. Resilient seated valves are often designed below ASME pressure class ratings, thus more cost effective for low pressure applications. Stem sealing consists of a primary seal (seat flat to disc hub), secondary seal (stem diameter larger than a hole in seat) and tertiary seal (upper stem seal).
Typical body materials include ductile iron, cast iron, carbon steel, aluminum, stainless steel and aluminum bronze. Typical seat materials include EPDM, Buna-N, PTFE, natural rubber and more. Resilient seated butterfly valves are mostly used for isolation and control applications including HVAC, chemical and petrochemical, food and beverage, power generation, water and wastewater, oil and gas, mining and dry bulk handling. They are selected based on compatibility with the media running through the pipeline and flow conditions.
POLYMER-LINED CONCENTRIC
Lined butterfly valves are also concentric with the pipeline and designed to be utilized with harsh chemical media: These polymer-lined products offer longer life in media with higher levels of acids. Options include PTFE-lined and PFA-lined valves, both used in the petrochemical, food and beverage industry with corrosive media. One of the main differences between the liners is that in steam engine prototypes PFA liners remain flexible in contrast to PTFE liners over time based on the way they are manufactured. PFA is melted and chemically bonded while PTFE is sintered. Melting and chemically bonding creates a denser material and minimizes air pockets, resulting in flexibility and tight shutoff over long-term use for harsher chemical applications. The PTFE lined butterfly valve is typically used in water, brine, pulp stock and weak acid applications. The disc material can also vary based on application, between stainless steel, or lined stainless steel with PTFE, PFA and UHMWPE (ultra-high molecular weight polyethylene).
HIGH PERFORMANCE
High performance butterfly valves (also called double offset) have two offsets: The first offset of stem is off center to or behind the disc seating face, followed by the second offset, which shifts the stem off centerline of the pipeline. This double offset creates camming action, moving the disc away from the seat rather than across it, reducing rubbing between the disc and seat as seen in concentric and single offset valves.
The double offset is commonly used for isolation and control applications, as well as higher cycle applications when compared to a concentric design. Most applications are made for higher temperature and pressure than resilient-seated valves. The seats are designed to provide reaction force (contact stress) to disc when in the closed position. This contact stress creates the seal with the disc edge. These designs can be pressure dependent, while others use interference fit provided by a seat energizer for that pressure range. Common body materials include carbon steel, stainless steel and aluminum bronze. Common seat materials include PTFE, reinforced PTFE, TFM, UHMWPE and Inconel.
Additional seat designs for specific application can also include fully metal seated and fire safe (both soft and metal seat). The metal seated design can withstand higher temperature capabilities up to 900°F in dirty service, abrasive service and control applications with hot and dirty service. The fire-safe seated design is used in services at risk for fire, using a soft seated material for isolation while still providing a constant metal-to-metal backup seal to the disc in the event of a fire. The intent of the valve design in these applications is to provide isolation to prevent feeding the flames.
The double offset design can be configured for cryogenic applications; they are most often used in industrial gas applications such as argon, helium, hydrogen, nitrogen and oxygen. The choice of materials is based on the service, focusing on toughness and impact strength of the pressure boundary materials at process temperature. The standards for these applications include strict material specifications along with cleaning requirements for safety and operation of the valves while in service.
TRIPLE OFFSET
Triple offset valves share the first and second offset concept with high performance butterfly valves and include an additional third offset, with the seating surfaces using an inclined conical surface. This third offset enables the sealing element (seal ring) to only engage the seating surface in the final degree of closing (and immediately disengaging from the valve seat upon opening) resulting in no rubbing between the sealing components. This valve type is torque-seated, meaning torque is applied to load the sealing elements and provide the shutoff performance. The seal ring can either be laminated layers of metal and graphite or a solid metal sheet, both of which are field replaceable. The valve seat can either be bolted in (field replaceable) or integral to the valve body. Triple offset valves are inherently fire safe and applicable to pressure classes from Class 150 up to Class 1500. This design can be used in a broad temperature range of -320°F to 1,500°F in varying configurations due to the metal-to-metal sealing.
Common body materials include carbon steel, stainless steel and aluminum bronze while common seat materials include 316 stainless steel hard-faced, nickel aluminum bronze, Stellite and duplex stainless steel. Common seal materials include laminated duplex stainless, Monel, XM-19 or Inconel metal layers with either graphite or PTFE, and solid metal options include duplex stainless steel, Inconel or XM-19. Main applications for the triple offset valves include steam-distribution, petrochemicals, tank farms, terminals, and switching.
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