Multiple O-ring shaft sealing eliminates any interaction between the process media and the stem/shaft, ensuring a long-term, maintenance-free seal. In addition, there are smaller, more common components like bushings, bearings, and fasteners that constitute the majority of other valve constructions. If you consent to us contacting you for this purpose, please click the box above. Find your closest Flowserve resource for new products and replacement parts.

Ductile Iron Double Flanged Spring Return Butterfly Valve

In the second offset, the shaft axis goes off the center of the pipe. Cannot be used in conjunction with corrosion resistant piping applications. The FCC structure have more slip planes as compared with BCC structure, making it more flexible for relieving compressive stresses.

Butterfly Valves

For throttling services, you can use a high performance butterfly valve, which is a higher industry standard for larger applications. Generally, this type of valve is manufactured to process large capacities and oftentimes, viscous and seawater medium. We will get more into high performance butterfly valves later. The construction of a butterfly valve is relatively simple, with the rotation of the valve disc controlling the fluid flow.

Jamesbury butterfly valves

Butterfly valves offer a number of advantages when used for the proper application. They may be used in a wide variety of chemical services, they are available with small dimensions allowing for use in areas where space is limited, and they allow a high coefficient of flow. One of the things that should be inspected during installation is the elastomer seal. It tends to move towards the face of the valve and gets compressed while you install it.

Explore the types of Butterfly Valves in Casting Industries

Some valves do have restrictions on the maximum throttling differential pressure, 35% of pressure rating in some cases. Double offset and triple offset butterfly valves are also bidirectional but with preferred flow direction, such as flow from the stem side. Their compact and lightweight design, availability in larger sizes and easy usability make our butterfly valves an attractive option for many industrial processes. Their versatility makes them suitable for a wide range of temperatures, pressures, industries, and applications. They can be used in either control, on-off or emergency shutdown service.

What is gear operated butterfly valve?

The cap screw length required is the thickness of one flange plus slightly less than half the thickness of the valve body, since the two cap screws must not interfere with each other. A different rarely used technique is to thread a stud bolt completely through the tapped holes in the body, long enough to extend through the bolt holes in each end flange, with a nut behind each flange. The butterfly valve, or rather the various types of valves that are collectively known as butterfly valves, will be discussed here as members of the family of throttling valves. Butterfly-type valves are indeed fully capable of flow control, and that ability will also be discussed.

WHAT ARE THE MAIN PARTS OF BUTTERFLY VALVE

However, it will be apparent from even a casual survey of valve installations that the majority of butterfly valves are used as block valves only. It is also true that some butterfly valves are more suited for throttling than others are, just as some are more suited for severe services than others are. It happens to be that the less expensive valves are among the ones that are not that suitable for throttling services.

The Ultimate Parts Of Butterfly Valve Technique

For specific applications, special material grades with even stronger corrosion resistance are used, such as super austenitic stainless steels , duplex and super duplex steels , and nickel alloys . When fully open, the disc of butterfly valve creates little turbulence or resistance to flow. The valve disc is always under pressure and can interrupt the flow even in an open position.

Butterfly Valves Vs Gate Valves

This shape helps the gate cut through any build-up that might accumulate in the recess and reduce the amount of torque needed to fully close the gate. Since the disc is present in the flow channel evermore, thick liquids can prohibit it from moving.

Butterfly valves have less space requirements

Under normal circumstances, under the same material, diameter and specifications, the structure of the butterfly valve is simpler, the volume is smaller, and the material is also less. Compared with the gate valve under the same conditions, the price is lower and more advantageous. In the working environment with a diameter of less than or equal to 400mm, gate valves and wafer-type butterfly valves can be used, depending on the site conditions.

butterfly valve

All ball valves 2″ and below are both standard and full port valves. The main differences between a butterfly valve and a ball valve are produced below in a tabular format. Spread the flange enough to allow the valves with disc in closed position. This prevents the damage of disc and seat during installation. In order for the disk to be held in the proper position, the stem must extend beyond the bottom of the disk and fit into a bushing in the bottom of the valve body.

This Is What I Use My Butterfly Valve Drawing For

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types of butterfly valve

Butterfly valves are quarter-turn flow control devices that utilize a metallic disc that rotates around a fixed stem axis. They are quick-action flow control valves that allow rotations through 90 degrees to move from fully opened to a closed position. The Valves are designed for functionality and reliability in many different industries like base chemical, agrochemical, speciality chemical, fluoro chemical industries. The zero offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. There are various types of valves available in the butterfly valve range. The offset disc of Butterfly Valves comes with techniques like hand wheel operated, gear operated, electric operated, and pneumatic operated.

Air Valve

In a double eccentric butterfly valve-offset butterfly valve design, the stem is located behind the disc with an additional offset to one side. The smooth contoured, crevice-free disc produces lower torques, while the design of butterfly valves makes them easy to install, maintain, and service. Gate valves tend to outperform butterfly valves when it comes to durability. The gate valve design ensures that it does not suffer as much damage as a butterfly valve when it is in operation. The difference between a butterfly valve and a gate valve is the way in which the gate valve operates inside the gate valve. The metal disc or the butterfly is a vital component and is perched on a rod, which stops the passage of liquid when the valve is closed.

butterfly valve with actuator

Powered actuators may operate electrically, mechanically, or hydraulically. For larger valve sizes, actuation may be aided by the addition of a gearbox to reduce the torque requirement on the operator. “Concentric butterfly valves” or “Zero offset butterfly valves” are designed with no offset of the disc from its stem. The valve seals via interference along the disc edge at the stem between and the rubber seat. Here, the stem doesn’t pass through the centerline of the disc. In eccentric butterfly valves, the stem is located behind the centerline disc.

Working principle of butterfly valve

They have good fluid control characteristics and close sealing performance. Wafer style butterfly valves are a design that has the valve control elements ready to be sandwiched between two flanges that, when installed, hold the valve in place. They are generally easier to machine than other types of butterfly valves, use less material, and are less expensive to produce.

butterfly valve uses

The FCC structure have more slip planes as compared with BCC structure, making it more flexible for relieving compressive stresses. So during plastic deformation at freezing temperatures, the FCC structure presents the material with a suitable amount of ductility and toughness for cryogenic applications. Note that energy costs increases with excessive pressure drop so be mindful to minimize pressure drops between the upstream and downstream portion of the valve when you design a piping system. Butterfly valve sizes may generally range from 2 inches to 60 inches, but there are those available up to 96 inches, depending on the manufacturer.