What Is a Butterfly Valve Used For?

Introduction to Butterfly Valve

A Butterfly shutoff is a quarter-turn rotational activity valve, that is utilized to quit, control, and start flow.
Butterfly valve are very easy and fast to open up. A 90 ° rotation of the take care of supplies a full closure or opening of the shutoff. Huge Butterfly shutoffs are typically equipped with a so-called gearbox, where the handwheel by equipments is linked to the stem. This streamlines the operation of the valve, but at the expenditure of rate.

Sorts of Butterfly shutoffs

Butterfly shutoffs has a short circular body, a rounded disc, metal-to-metal or soft seats, leading and also bottom shaft bearings, and a stuffing box. The construction of a Butterfly valve body varies. A generally used style is the wafer kind that fits in between 2 flanges. An additional type, the lug wafer layout, is kept in place between 2 flanges by screws that sign up with the two flanges and go through holes in the shutoff's outer case. Butterfly shutoffs are also readily available with flanged, threaded and also butt welding finishes, but they are seldom used.
China casting valve manufacturer believe that: Butterfly valves possess lots of benefits over gate, globe, plug, and also ball valves, especially for big shutoff applications. Financial savings in weight, area, and price are one of the most obvious advantages. The maintenance prices are usually reduced since there are a very little variety of relocating components as well as there are no pockets to catch fluids.
Butterfly valves are particularly well-suited for the handling of large flows of fluids or gases atrelatively low pressures and for the handling of slurries or liquids with big quantities ofsuspended solids.

Butterfly valves are improved the concept of a pipeline damper. The circulation control aspect is a disk of about the same size as the within diameter of the adjacent pipeline, which rotates on either an upright or straight axis. When the disk lies parallel to the piping run, the shutoff is completely opened up. When the disk approaches the perpendicular position, the valve is closed. Intermediate settings, for throttling functions, can be secured in position by handle-locking devices.

Butterfly shutoff Seat Construction

Deduction of circulation is completed by the shutoff disk securing against a seat that gets on the inside size perimeter of the shutoff body. Many Butterfly valves have an elastomeric seat versus which the disk seals. Other Butterfly valves have a seal ring plan that makes use of a clamp-ring and also backing-ring on a serrated bordered rubber ring. This style stops extrusion of the O-rings.

In early layouts, a metal disk was made use of to secure versus a steel seat. This arrangement did not offer a leak-tight closure, however did offer enough closure in some applications (i.e., water distribution lines).

Butterfly valve Body Building and construction

Butterfly valve body building differs. The most cost-effective is the wafer kind that fits between two pipe flanges. Another kind, the lug wafer design, is held in area in between two pipeline flanges by screws that join the two flanges and pass through holes in the shutoff's outer casing. Butterfly valves are offered with traditional flanged ends for bolting to pipe flanges, as well as in a threaded end building and construction.

Seat Disk and Stem of a 20K Butterfly Valve

The stem and also disk for a Butterfly valve are separate items. The disk is bored to receive the stem. Two approaches are made use of to protect the disk to the stem so that the disk turns as the stem is transformed. In the initial method, the disk is burnt out via as well as secured to the stem with screws or pins. The alternative technique involves tiring the disk as in the past, then shaping the upper stem birthed to fit a settled or hex-shaped stem. This technique allows the disk to "drift" and also seek its center in the seat. Uniform sealing is accomplished and also external stem bolts are gotten rid of. This method of setting up is beneficial when it comes to covered disks and in corrosive applications.

In order for the disk to be kept in the proper setting, the stem has to prolong beyond the bottom of the disk as well as fit into a bushing in the bottom of the shutoff body. 1 or 2 comparable bushings are along the upper portion of the stem too. These bushings have to be either resistant to the media being managed or secured to make sure that the corrosive media can not come into contact with them.

Stem seals are accomplished either with packing in a standard stuffing box or using O-ring seals. Some shutoff producers, particularly those concentrating on the handling of harsh products, place a stem seal on the within the valve to make sure that no material being handled by the valve can come into contact with the valve stem. If a stuffing box or exterior O-ring is employed, the liquid passing through the valve will certainly enter into contact with the valve stem.

20K Butterfly Valve

Typical applications of Butterfly valves

A Butterfly shutoff can be utilized in many different fluid services and also they perform well in slurry applications. The adhering to are some typical applications of Butterfly shutoffs:
Air conditioning water, air, gases, fire security and so on
Slurry as well as similar services
Vacuum solution
High-pressure and high-temperature water as well as vapor solutions

 

Benefits of Butterfly valves

Small style needs considerably much less room, compared to various other shutoffs
Light in weight
Quick operation needs much less time to open up or close
Available in very large sizes
Low-pressure decline as well as high-pressure recovery

Disadvantages of Butterfly valves

Throttling service is limited to reduced differential stress
Cavitation and also choked flow are two possible problems
Disc activity is unguided as well as affected by circulation turbulence

 

14 taboos to install a valve

Installing valves is not an easy task. There are 14 taboos. Do you know? What happens if these taboos are violated? How to solve it?

Taboo 1: Perform hydraulic test at negative temperature during winter construction.

Consequence: The tube freezes quickly due to the rapid freezing in the tube during the hydrostatic test.

Measures: Try to perform a hydraulic pressure test before the winter application, and blow the water after the pressure test, especially the water in the cast iron gate valve must be cleaned, otherwise the valve will freeze and crack.

The project must be carried out at a positive indoor temperature during the hydrostatic test in winter, and the water should be blown off after the test. When the hydrostatic test cannot be performed, the test can be performed with compressed air.

Taboo 2: The pipeline system is not carefully flushed before completion, and the flow rate and speed cannot meet the pipeline flushing requirements. Even hydraulic pressure test leaks instead of flushing.

Consequences: The water quality does not meet the requirements of the pipeline system, and often causes the pipeline section to decrease or block.

Measures: Use the maximum juice flow in the system or the water flow speed should not be less than 3m / s for flushing. It shall be qualified that the color and transparency of the water at the outlet and the color and transparency of the water at the inlet are consistent with visual inspection.

Taboo 3: Sewage, rainwater, and condensate pipes are concealed without a closed water test.

Consequence: May cause water leakage and loss to users.

Measures: The closed-water test work shall be strictly checked and accepted in accordance with the specifications. Concealed sewage, rainwater, and condensate pipes, such as buried underground, inside the ceiling, and between pipes, must be ensured to be leak-proof.

Taboo 4: During the hydraulic pressure strength test and tightness test of the pipeline system, only the pressure value and water level change are observed, and the leakage inspection is not enough.

Consequence: Leakage occurs after the pipeline system runs, which affects normal use.

Measures: When the pipeline system is tested according to the design requirements and construction specifications, in addition to recording the pressure value or water level change within the specified time, it is especially necessary to carefully check whether there is a leakage problem.

Taboo 5: Ordinary valve flanges for 20K butterfly valve flanges.

Consequences: The size of the flange of the butterfly valve is different from that of the ordinary valve, and some flanges have a small internal diameter, while the butterfly valve has a large disc, which can cause the valve to fail to open or hard to open, causing damage to the valve.

Measures: The flange should be processed according to the actual size of the butterfly valve flange.

Taboo 6: No holes or embedded parts are reserved in the construction of the building structure, or the size of the reserved holes is too small and the embedded parts are not marked.

Consequences: During the construction of heating and sanitary engineering, picking up the building structure, or even cutting off the reinforced steel bars, affects the safety performance of the building.

Measures: Familiarize yourself with the construction drawings of the heating and sanitation project, and actively cooperate with the construction structure to reserve holes and embedded parts according to the requirements of the installation of pipes and supports and hangers, and refer to the design requirements and construction specifications.

Taboo 7: When welding the pipeline, the pipe misalignment after the counterpart is not on a center line, there is no gap in the counterpart, the thick-walled pipe does not shovel the groove, and the width and height of the weld do not meet the requirements of the construction code.

Consequence: The misalignment of the tube is not directly on the center line, which directly affects the welding quality and the quality of the look and feel. There is no gap at the mouth, the bevel of thick-walled pipes is not shovel, and the width and height of the welds do not meet the requirements of strength when the welding does not meet the requirements.

Measures: After welding the pipe counterparts, the pipes must not be staggered. There must be a gap on the center line of the counterparts. Thick-walled pipes must be shoveled. In addition, the width and height of the welds should be welded in accordance with the requirements of the code.

How Does the Valve Perform Routine Maintenance?

1. For long-term storage, the valve maybe from China Cast Iron Gate Valve manufacturer should be inspected regularly. The exposed surface should be kept clean and the dirt should be removed. The ball valve should be blocked at both ends and open when stored. Gate valve, globe valve, check valve, both ends of the channel should be Blocked and closed, neatly stored in a ventilated and dry place indoors, no stacking or open storage.

2. Before installation, the pressure of the valve mark must be checked carefully, whether the diameter meets the requirements for use, eliminate the defects caused by the transportation process, and eliminate the dirt of the valve parts.
3. When installing, the valve maybe from China Casting Valve Manufacturers can be directly installed on the pipeline according to the connection mode. Under normal circumstances, it can be installed at any position of the pipeline, but it is easy to operate. Note that the flow direction of the shut-off valve should be upward from the longitudinal valve flap. The lift check valve can only be installed horizontally.

If you want to Wholesale Angle Globe Valve or other valves, welcome to contact us.

 

Double Eccentric Butterfly Valve and Cast Iron Butterfly Valve

Butterfly valve, also known as flap valve, is a simple control valve, which can be used for the on-off control of low-pressure pipeline medium. It refers to a valve whose closing piece (disc or butterfly plate) is a disc and rotates around the valve shaft to open and close.

The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It is mainly used to cut off and throttle the pipeline. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment.

Double eccentric butterfly valve is also called high-performance butterfly valve, which is mainly used for drainage of water plant, power plant, steel plant smelting, chemical industry, water source spring project, environmental facilities construction and other systems, especially for water pipeline, as regulating and closure equipment. Compared with the center line butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, has longer service life and good stability Compared with other valves, the larger the diameter, the lighter the material and the lower the cost. But because there is a butterfly plate in the middle, the flow resistance is large, so the butterfly valve smaller than DN200 is of no great significance.

 

Cast iron butterfly valve is also called flap valve. Its opening is basically linear with flow. If it is used to control the flow, its flow characteristics are closely related to the flow resistance of the pipeline. For example, the caliber and form of the valve installed on two pipelines are the same, and if the pipeline loss coefficient is different, the flow of the valve will be very different.

How to choose butterfly valve?

Butterfly valve, also known as flap valve, is a simple control valve, which can be used for the on-off control of low-pressure pipeline medium. It refers to a valve whose closing piece (disc or butterfly plate) is a disc and rotates around the valve shaft to open and close. The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It is mainly used to cut off and throttle the pipeline. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment.

Various types of butterfly valves ,For example, pneumatic butterfly valve, cast Iron butterfly valve,Center seal butterfly valve ,wafer center line butterfly valve,Forced seal butterfly valve,flanged double eccentric butterfly valve etc.

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. The butterfly valve is simple in structure, small in volume and light in weight. It is only composed of a few parts, and can be opened and closed quickly only by rotating 90 °. The operation is simple. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the butterfly plate thickness is the resistance when the medium flows through the valve body, so the pressure drop generated through the valve is very small, so it has better flow control characteristics. If butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of valve. The structure and principle of butterfly valve is especially suitable for making large-diameter valve. There are two kinds of butterfly valves commonly used: wafer butterfly valve and flange butterfly valve. Double clip butterfly valve is to connect the valve between two pipe flanges with stud bolts. Flange butterfly valve is to connect the flange on both ends of the valve to the pipe flange with bolts. Butterfly valve, as a component used to realize on-off and flow control of pipeline system, has been widely used in many fields, such as petroleum, chemical industry, metallurgy, hydropower, etc. In the well-known butterfly valve technology, the sealing structure is mostly adopted, and the sealing materials are rubber, polytetrafluoroethylene, etc. Due to the limitation of structural features, it is not suitable for industries such as high temperature, high pressure, corrosion resistance and wear resistance. A more advanced butterfly valve is a three eccentric metal hard seal butterfly valve. The valve body and valve seat are connected components. The sealing surface of valve seat is overlaid with heat-resistant and corrosion-resistant alloy materials. The multi-layer soft laminated seal ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has the advantages of high temperature resistance, light operation, no friction between opening and closing. When closing, it compensates the seal with the increase of the torque of the transmission mechanism, improving the sealing performance of the butterfly valve and prolonging its service life.

Industrial Valve Types and Applications

Valves are employed in just about any situation involving the flow of liquid or gas. A valve controls the flow of water through your kitchen sink. A different valve brings propane gas into the burners of a gas stove. Outside the home, industrial valves are built to handle high pressure, either from fluid or gas, and to last through years of use in harsh environments. Most utilities, from water to oil and gas, wouldn't be able to function without heavy duty, industrial-strength valves.

 

Because many components of industrial valves are cast, foundries and machine shops like the Yuanda Valve often supply valve manufacturers with the parts they need to assemble finished products. The following valve types represent the most commonly seen valves for industrial applications around the world.

 

Gate Valves

A gate valve consists of a channel that can be opened or closed by moving a metal gate up and down. When raised, the gate clears the channel and allows flow; when lowered, the gate obstructs the channel.

 

Most often considered isolation, or on/off valves, gate valves have been around for decades. Their simplicity allows them to be produced at relatively low cost, and with fewer parts than other valve types. However, their design makes them difficult to control precisely. Gate valves are most prevalent in the water industry.

 

Butterfly Valves

A butterfly valve consists of a channel and a paddle affixed to the channel through its central axis. The paddle, which is often disc-shaped, can spin to obstruct or open the channel.

 

Butterfly valves are another type of isolation valve; while they offer little control in terms of flow rate, they do allow large volumes of material to flow through the channel. Because the paddle can be positioned parallel to the flow, they barely obstruct the flow when opened. Butterfly valves are easier to control through remote actuators than gate valves, but they are often limited to large-volume applications.

 

Ball Valves

A ball valve is comprised of a valve housing, which is often a metal casting, and a perforated ball. Actuating the valve turns the ball, increasing the flow as the perforation comes in line with the channel.

 

New developments in ball valves, such as segmented ball valves, allow greater control over flow rates. As a result, modern ball valves have many advantages: they can be precisely controlled, either manually or electronically, and they also allow higher volumes than globe valves.

 

Globe Valves

A globe valve is characterized by an S-shaped channel and a horizontally oriented valve member that raises and lowers to control the flow of fluid or gas.

 

Globe valves are designed as control valves, and are able to modulate flow more accurately than other valve types. Not only does globe valve design support control, but many valve bodies allow interchangeable inner parts, so the orifice in the middle can be larger or smaller depending on the user's needs. However, globe valves restrict flow more than other valves; ball valves can offer 30% - 40% higher flow rates.

 

Valve Manufacturing

No matter what type of valve is being produced, the manufacturing process takes several steps. Many valve components can be cast, resulting in durable valve bodies and inner parts. In order to finish valve bodies, threads must be machined into any areas that will connect to other valve parts, or to upstream and downstream pipes.

 

Inner components can be produced using a variety of methods. The ball of a ball valve often must be machined in order to produce the smoothest, most precise spherical surface possible.

 

Depending on the surface finish and tolerances required, a variety of metal casting methods can be used to produce valve components. Yuanda Valve produces valve enclosures, bonnets and other parts through shell mold casting.  Yuanda Valve manufactures additional components through investment casting. Still more metalcasting processes are used by  Yuanda Valve, like permanent mold casting and greensand casting, to manufacture valve system components for different applications.

 

To learn more about industrial valves and valve manufacturing check out our post, Anatomy of an Industrial Valve

How Much Do You Know about Valves？

Cast steel gate valve: it is a general designation of cast steel gate valve, which is cast into castings with metal steel materials. Cast iron gate valve, forged steel gate valve and malleable iron gate valve corresponding to cast steel gate valve.

Cast steel gate valve: according to the material, there are carbon steel gate valve, stainless steel gate valve, low alloy steel gate valve (high temperature resistant chromium molybdenum steel belongs to this category), low temperature steel gate valve, etc. Under all kinds of cast steel gate valves, there are various specific steel grades commonly used as follows: 

1.The cast grades of carbon steel gate valve are: WCA, WCB, WCC, LCB, etc.; applicable temperature is - 46 ℃ ~ 425 ℃. 

2.Stainless steel gate valve casting brand: 301 stainless steel, CF8 stainless steel (corresponding to 304 stainless steel forging), CF8M stainless steel (corresponding to 316 stainless steel forging), etc.; applicable temperature: - 198 ℃ ~ 816 ℃. 3. Low alloy steel includes high temperature alloy steel and high strength low alloy steel, among which high temperature alloy steel is commonly known as chromium molybdenum steel. Cast grades of Cr Mo steel gate valve: zg1cr5mo, zg15cr1mov, ZG20CrMoV, wc6, wc9, c12a, etc. Applicable temperature: 550 ℃ ~ 750 ℃. The applicable temperature of each specific brand material is different, which is selected according to the actual working conditions. 

What is the difference between Forge Steel Globe Valve and Motorized Globe Valve？ 

Forged steel globe valve is suitable for most occasions, and the requirements for temperature medium are not high. However, there are many differences in its corresponding suitable places. For example, the following categories, including forged steel angle globe valve and forged steel flange globe valve, are common. They can bear a lot of pressure, and the sealing surface is not easy to wear and scratch, the sealing performance is good, and the technical requirements for operators are not high, so they are very suitable for flow regulation, and have applications in many fields. 

Electric stop valve, also known as electric stop valve, is the most widely used valve, which is different from electric ball valve. It is widely popular because of the small friction between the sealing surfaces in the opening and closing process, which is more durable, less opening height, easy manufacturing and maintenance. It is not only suitable for medium and low pressure, but also for high pressure. The closing principle of the electric stop valve is to rotate the valve rod by the electric thrust, so that the sealing surface of the valve disc and the sealing surface of the valve seat fit closely, and prevent the flow of medium The electric stop valve only allows one-way flow of medium and has directionality during installation. The structural length of the stop valve is longer than that of the gate valve. At the same time, the fluid resistance is large, and the sealing reliability is not strong in long-term operation.