A Beginner’s Guide on How to Pick the Right Butterfly Valve
Butterfly valves are helpful to industries that need to control the flow of the system. That is why there is a need for in-depth consideration in selecting a butterfly valve. How do you know it is the right butterfly valve?
The process of selecting the right valve is a little tricky. One of the vital factors that drive out buyers is the cost. Take some of these considerations in choosing a suitable butterfly valve.
Quick Introduction to Butterfly Valves
Butterly valves are sophisticated yet useful for the industries. Before picking the right butterfly valve that you need, you have to know its body types and disc alignment.
Body Types of Butterfly Valves
Wafer-type Butterfly Valve
Most industries that use the wafer body type are those that have systems with unidirectional flow. It prevents any backflow of the medium by maintaining its seal against the bi-directional pressure.
Flanged-type Butterfly Valve
Companies with large size valves mostly use the flanged-type. You will notice that the flange body type has a face on both sides. Some companies who want to cut off their budget uses this type instead of the U shaped valve. However, the common problem with this body type is it is may not be parallel. It will give the operators a hard time bolting against the flanges.
Lug-type Butterfly Valve
What makes the lug-type butterfly valve is the threaded inserts on its sides. It allows the operators to install it on systems with no head nuts and only two sets of bolts. This kind of body type is placed in between two flanges with a separate set of bolts. It is a recommended set up to allow the operators to disconnect one side without interrupting the other.
The lug-type butterfly valve is resistant to solvents and chemicals. Moreover, it can handle extreme temperatures up to 200 °C.
Types of Disc Alignment on Butterfly Valves
Aside from its various body types, the butterfly valves also differ from its disc alignment. There are three ways in which the disc is aligned in a valve — most butterfly valves with plastic-lined use the zero-offset alignment. Meanwhile, the rubber-lined and metal valves use the double offset or triple offset valves.
Zero Offset (Concentric Butterfly Valves)
Most butterfly valves with zero offset use a metal disc and resilient rubber seat. When the disc rotates, it enables a 360° turn. Industries that deal with gas and liquid applications need this type of concentric butterfly valves.
It can handle abrasive media applications going through the valve. The medium does not contact the body as the seat covers the body.
Double Offset Butterfly Valves
It is the most common high-performance butterfly valve as it is used for several applications. The rod goes through the body seal and centerline, which provides two offsets. The alignment provides a cam action during the process.
The third offset of this alignment is not found on the rod but the sealing components. The component is engineered into a conical structure, creating a right-angled cone. Its design structure ensures that it has a friction-free stroke throughout the cycle.
It is a tough decision to choose the right valve, knowing that it has several characteristics to consider. Before you make a decision, go over the guidelines and contact a reputable manufacturer with specialists. Huamei high-performance butterfly valves are something to consider. As they come from a reputable manufacturer, and they have a team of specialists.
What to Consider in Picking the Right Choice of Butterfly Valve
Ease of Operation
High-performance butterfly valves are easy to use for operators. They can close or open the valve with just a 90° turn. It is not the same as the globe and gate valves that need to be turned multiple times. Moreover, it has a bubble-tight shut-off feature that seals the disc from any abrasive medium.
Other than the throttling and balancing function of butterfly valves, they are also versatile. Some high-performance butterfly valves can survive in extreme temperature applications.
It is wise to consider the pressure drop of the butterfly valve. An increase in pressure drop will result in higher energy costs. Other than the valve, there are some contributing factors: the flow area, friction loss on the piping walls, and the change of flow direction.
Physical features of the valves
Some operators know that the butterfly valve generally costs cheaper than other valves. But, you can save more on the construction costs, if you consider the physical features of the butterfly valves. Butterfly valves are lightweight and small in size. Thus, this is an advantage for those who consider building structures.
You need to consider the strategy in maintaining butterfly valves. It is one of the primary considerations for operators, internal repairs for these valves need to remove the pipes. Some valves are maintenance-free and self-cleaning when it is correctly installed.
We hope that the quick introduction and list of considerations in choosing the right butterfly valve helped you. It is best to have these ideas first before going to the market. Using the wrong butterfly valve in the industry can lead to detrimental effects. Avoid making mistakes by being informed.