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Subscribe to this list via RSS Blog posts tagged in Butterfly Valve

b2ap3_thumbnail_wafer-lug-butterfly-valve-differences.pngButterfly valves have been around for a long time, and are used for a variety of applications. They made their first appearance during the 1930s, and have been utilized by several industries ever since. Often made out of cast iron, butterfly valve's name is based from the functionality of its disc. There are a few different types of butterfly valves, however, they fall into two basic types - Lug and Wafer valves.

More About Butterfly Valves

Butterfly valves are classified as "quarter-turn" valves. When the metal disk that's part of the valve’s design is rotated a quarter of a turn, it opens or closes. The disk, referred to as the "butterfly" is attached to a rod. When the butterfly valve is opened all the way, the disc rotates (a 1/4 turn), allowing for a nearly unrestricted passing of the fluid. You can also open the valve gradually to reduce flow. Turning the butterfly (disk), to close the valve, blocks the passage of the fluid. This is due to the disc always being perpendicular or parallel to the flow, resulting in a pressure decrease regardless of the position it is in.

Lug Butterfly Valve

The lug version of the butterfly valve's design is similar to a 3-piece ball valve in that one end of the line can be taken off without having an effect on the opposing side. This can be executed by using threaded inserts, flanges, along with two sets of lugs (bolts) that don't utilize nuts since each flange features its own bolts. It's also important to note that you don't need to shut down the entire system in order to clean, inspect, repair, or replace a lug butterfly valve (you would need to with a wafer butter valve).

Wafer Butterfly Valve

A wafer butterfly valve's function is to retain a seal to protect against dual-directional pressure differential in the flow of fluid. In other words, the wafer version of butterfly valves was designed to hold a tight seal, safeguarding against bi-directional pressure differential in order to avoid any backflow in systems that have been manufactured for uni-directional flow. This is accomplished by using a tightly fitted seal, such as an O-ring, gasket, precision machined, along with a flat valve face on the downstream and upstream sections of the valve.

Both lug and wafer butterfly valves are used in a number of applications for industrial sectors that include food processing, pharmaceutical, chemical, oil, water as well as waste water management. The valves utilized in these industries are generally manufactured in compliance with the "Pharmaceutical Quality/Manufacturing Standard", cGMP (current good manufacturing practice) guidelines. Butterfly valves for the most part have replaced ball valves in a lot of industries. This is especially the case for those dealing with petroleum because of they are less expensive and easy to install. It's important to note that pipelines that contain butterfly valves can't be 'pigged' for cleaning. "Pigging" is the process of making use of devices referred to as "pigs" to carry out a variety of maintenance operations.

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Butterfly valves are used to prevent and isolate the flow of fluid in industrial sectors. They are easy to handle and very fast in stopping the flow. They are majorly preferred by the customers because of its low cost and light weight. There are different types of butterfly valves are available in the market for wide range of uses and pressures.

  • The leading manufacturers of AWWA Butterfly Valve have to meet the standards and norms of AWWA standard C504.Every manufacturer assures that every design of valve is better than the previous one. Awwa butterfly valve doesn’t leak from anywhere and won’t damage by corrosion.
  • They are easy to maintain and possess low maintenance cost and perform amazingly well in worst conditions. Before manufacturing these butterfly valves they ensure the thickness of shell, torque capabilities and material of construction.
  • These AWWA Butterfly valves are not vulnerable to corrosion which will deposit on the iron valve body and also on the fittings of pipe adjacent to it. They design their valves with thick wall-stainless steel which is resistant of corrosion and smooth.
  • They don’t use lesser mating seats because they are not corrosion resistant and can damage the fittings and rubber seats adjacent to it due to corrosion.Seats incorporated on the disc of valves can be removed, replaced and adjusted easily. These butterfly valves are very flexible and can be adjusted in every possible direction.
  • Their valve seats should be manufactured in way that permits replacement and removal easily at the time of installation. If it will not manufactured like this then every time this butterfly valve will go to repair and become a burden on the owner.

AWWA Butterfly Valve Working Conditions:

A butterfly valve operation in the most adverse conditions and it is supposed to perform well in stress situations. Regardless of the direction of the fluid, the edge of the discs will always be little bit upstream which is good in worst conditions. These valves are very short and precise that’s why mostly preferred in industrial applications.

  • They are considered very reliable, effective and don’t ask for regular maintenance.  They have all the options to operate i.e. they can be configured manually, automatically and pneumatically. Automatic valves are durable that’s why responsible in the reduction of operational costs.
  • Different type of material is used in the construction of AWWA butterfly valve so that it can deliver best. Each material has its own advantages and disadvantages. Carbon steel is preferably used to manufacture the valve and seat because it provide cost-effective solutions to its customers.
  • Carbon steel has one major drawback i.e. it easily get corroded. But this can be overcome easily by painting its surface. Stainless steel can also be used to manufacture these butterfly valves. There are so many versions of stainless steel are available in the market such as austenitic, duplex, ferritic and many more.
  • Low maintenance and operational cost of these valves increase its life-cycle and also saves the time of its customers which usually get lost in its maintenance.

 

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Posted by on in Valve 101

b2ap3_thumbnail_3way-butterfly-valve-blue-actuator-valve9.pngThe assemblage of a butterfly valve is embodied a metal plate with a rod that goes through the circle. The bar is joined with an actuator or a manual lever which controls the circle turning it parallel or perpendicular to the stream. Contingent on the application, the circle might be made of steel, plastic, stainless steel or carbon steel. There are diverse choices of actuators for this valve: pneumatic, electric and electro-water driven, manual and a rigging sort.

There are different butterfly valves being used in every industry possible. The butterfly valve, otherwise known as quarter-turn valve, is a standout amongst the most famous and conservative valves. You may not understand it, however you experience butterfly valves once a day. These valves, made of cast iron, carbon steel, plastic or stainless steel, are frequently used in several applications where grouped sorts of liquids, gas, air, steam are continuously controlled by closed off or throttling. This valve is magnificent for close off applications and the circle can totally hinder the path for liquids.

Design of a 3-way butterfly valve

A 3-way butterfly valve comprises of a moderately level round plate with a pole through its measurement. The round plate makes an immaculate seal in the channel in which it is introduced by being flush with the funnel. The rod in the width of the round plate uses up the channel as a turning system that turns the rod and so pivots the roundabout valve plate. The pole, like the roundabout plate, must be flush with the dividers of the hold in which it is set, in order to wipe out the danger of holes. It is for the most part not able to be seen inside the valve, in light of the fact that it is typically catapulted between two different plates that make up the roundabout plate.
Ball Valve Element

A circular part in a three-way valve that has an opening straight through it is a ball valve element is a. The ball valve component turns on its hub on a ring valve situate within a three-way valve, either uncovering the opening or dismissing it from the valve opening (where the funnel, tubing or hose meets the valve). A handle is mounted on the outer surface top of the valve for opening, shutting and controlling the bearing water moves through the three entries in the valve. A full bore three-way valve lets loose component with the opening measured to the definite size of the funnel inside. The essentialness of full bore 3-way butterfly valve is persistent, even weight moving through the channel. Also, the seal is less inclined to holes.

Characteristically 3-way valves alone can't be fire-safe in light of the fact that their multiport outline does not permit them to stop. 3-way valves are accessible with flame safe gaskets and organ pressing. A flame tried framework might be attained by applying the 3-route on two ports. A L port or a T port 3-way could be connected.

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b2ap3_thumbnail_typical-butterfly-valve.gifButterfly valves are like ball valves however have a few focal points. They are small and when activated pneumatically, open and close rapidly. The plate is lighter than a ball, and the valve requires less structural backing than a ball valve of equivalent distance across. Butterfly valves are exceptionally precise, which makes them invaluable in modern applications. They are truly solid and require almost no upkeep. There are two sorts of butterfly valve, an eccentric type and a concentric. The eccentric type can be single, double, or triple-offset type.  The most accessible in the business sector for eccentric type are double-offset or triple-offset. A few times this 2 sub-sort of butterfly valve is additionally called as an elite butterfly valve. With these 3 variation of butterfly valve (concentric, double offset, and triple offset), in what condition we ought to utilize a concentric, double-offset, or the triple-offset one?

As a matter of fact let’s see what is the diverse between concentric butterfly valve, the triple-offset butterfly valve and double-offset butterfly valve. The concentric butterfly valve is a standard or a general utilize butterfly valve. The pole is found in the middle of the plate. Amid opening or shutting, there are a few parts of the plate that constantly in-contact or rubbing the seat. This course of action will make the seat encounter a grating each one time the valve is working. In run of the mill application, this concentric butterfly valve is constrained to class 150 because of its seat outline.

The Benefits of Double Offset Butterfly Valves: The double-offset butterfly valve is a valve that has 2 counterbalance contrasts and the concentric butterfly valve. The principal balance is the pole that is spotted not in the middle of the plate yet found on somewhat behind the circle. This balance will make the valve has a nonstop fixing surface on the circle. The second balance is the pole that placed not in the funnel fixates line yet found on somewhat in the right half of the focal point. This counterbalance will make the valve didn't touch the seat at all when it is completely opens (see delineation beneath). This plan will make the seat encounter a less grating than the concentric sort butterfly valve and accordingly will delay its lifetime. In common application, this twofold balance butterfly valve is restricted to class 600.

The Benefits of Triple Offset Butterfly Valves: Triple Offset Butterfly Valves are vital in applications where bubble-tight shut off is needed. In a few applications, bubble-tight shut off can't be accomplished utilizing twofold counterbalanced butterfly valves. A few applications don't give themselves well to conventional butterfly valves, for instance applications including savage chemicals or media with little particles inclined to obstructing valves and duct. In these types of applications, Triple Offset Technology offers huge profits.

The triple-offset butterfly valve is a valve that has 3 balance contrast and the concentric butterfly valve. Much the same as the Double Offset butterfly valve that has 2 balances, this triple counterbalance additionally has the same counterbalance aside from it has one extra counterbalance which is a funnel shaped shape seat. This tapered shape seat will match with the plate that likewise created to match the seat. This plan will make the seat has no grating or rubbing while shutting or opening. This game plan will additionally make the valve has an air pocket tight in high weight application and any longer lifetime as opposed to Double Offset butterfly valve.

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Among the two most common types of rotary valves are the ball valves and butterfly valves. Both vales have a 90 degree turn and are mainly used to control the flow of gases and liquids. There are certain features which make the ball valves better than the butterfly valves.

For a start, a ball valve can give you the perfect seal. You will not expect any leakages when the valve is fully closed. The other amazing thing about the ball valve is the fact that it turns regardless of the pressure from the supply pipe. This is a valve which will not reduce the pressure of the fluid once it is fully opened.

Ball valves are mainly used to control the flow of high pressure liquids and gas lines. This is because they do not cause any drop in pressure or restrict fluid movement when fully opened. They are mainly used when the supply pipe has an inner diameter of 6 inches or less.

Unlike butterfly valves, ball vales are used to control gas flows. This can be attributed to the fact that they provide a reliable seal unlike the butterfly valves which do not give you that perfect seal.

Ball valves do not present any trouble turning in high pressure applications. Additionally, when ball vales are used in high pressure applications, a pressure balancing scheme is not required. The same cannot be said regarding the butterfly valves.

Ball vales have a very simple structure. They are also smaller and lighter compared to many other types of valves. Ball valves give very flexible soft seals which make it very easy for one to operate them.  Ball valves give the smallest level of fluid resistance compared to all other types of valves.

You can use the valve for many years without experiencing any loss in form of leakages. This basically means that the valve is reliable and cost effective in the long term. This is the kind of valve that can be engineered to stand extremely high pressure. In fact, you will realize that high pressure systems usually have a ball valve inside them.

This allows the valve to turn the system on and shut it off as required. The ball valve can have a number of ports in it. It can allow a number of porting combinations. If you are thinking of buying the ball valve, consider these advantages prior to making your purchase.

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Posted by on in Valve 101

A butterfly valve is a type of quarter turn valve. A quarter turn valve can open or close whenever the handle is turned 90 degrees (a quarter of a turn). The main function of these valves is to control the flow of liquids through a section of pipe. Butterfly valves are mainly used in waste treatment systems. They are extremely durable and need minimal maintenance.

Butterfly valves operate like other quarter turn valves. Understanding the way a basic butterfly valve works is pretty simple. It can help you to learn more about the components of valves.

Butterfly valves are made of a number of components. The most important one is the metal disc. This metal disc is the one commonly referred to as the butterfly. The butterfly is mounted on a rod and when the valve is closed it blocks passage of fluid. When the valve is fully open, the metal disc or butterfly moves a quarter turn. The passageway is unrestricted allowing fluids or air to pass.

In essence, the movement of the disc will depend on whether the valve is open or closed either partially or completely. If the valve is opened partially, it means that the disc will not be rotated a full one quarter turn, thus it cannot provide unrestricted passage. This means that, smaller amounts of fluid or air will pass through. However, if the valve is opened completely, the disc will be rotated 90 degrees then larger amounts of air or fluid will pass through.

There are many other components that form the butterfly valve. They include the resilient seat, body, packing, a stem and an actuator. The resilient seat is mounted on the body of the butterfly valve in order to provide the proper seal. The packing provides an additional seal especially in case the resilient seat is damaged.

Butterfly valves are configured differently. There are some which operate manually whereas others operate electronically depending on the system. They also come in different styles. There are those which offer high performance in systems like large pump lines and front suctions.

Butterfly vales can also be used in automobile systems. For instance, you will find the butterfly valve inside the carburetor of a car. In this case, the valve is used to control the flow of air to the car’s engine. It can partially open and close to regulate the amount of air passing through.

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Posted by on in Valve 101

b2ap3_thumbnail_butterfly-valve-article-image.jpgThere are various butterfly valves being utilized in every industry imaginable. The butterfly valve, aka quarter-turn valve, is one of the most popular and economical valves. You may not realize it, but you encounter butterfly valves on a daily basis. These valves, made of carbon steel, cast iron, stainless steel or plastic, are being utilized in many applications where assorted types of fluids, gas, air, steam are being controlled by shut-off or throttling. This valve is excellent for shut-off applications and the disk can completely block the passageway for fluids.

The body of a butterfly valve is comprised of a metal disk with a rod that runs through the disk. The rod is connected to an actuator or a manual lever which controls the disk turning it parallel or perpendicular to the flow. Depending upon the application, the disk can be made of plastic, steel, carbon steel or stainless steel. There are different options of actuators for this valve: pneumatic, electric and electro-hydraulic, manual and a gear type.

There are 3 types of butterfly valves. The standard butterfly valve is the concentric butterfly valve. The disk is metal with a rubber seat. Next, is the doubly-eccentric butterfly valve consists of various types of material for the disk and seat. This one is more of a high-performance valve. Lastly, the triply-eccentric butterfly valve (known as triple offset butterfly valve) is utilized when the application requires tight shut-off when gas or oil are involved. Being the most of expensive of the butterfly valves, the seats are typically laminated or metal in design.

Butterfly valves can be wafer or lug style. You will see wafer style valves installed when the valve is between pipe flanges. Lug style simply means that there are holes machined so that it can be bolted to the flange. These valves are typically used in HVAC applications, water systems, OEM, or irrigation for positive shut-off. Lug style will be a bit more expensive and are used at the end of the line.

When it comes to ordering butterfly valves for your specific application, you want to make sure that you are ordering from reputable and experienced company such as Valtorc International. Before you order, please know what element(s) you are dealing with, know the size needed, type of material and pressure flow, if possible. We can offer an assortment of trim features to ensure a perfect match for your particular valve needs.

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