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Views: 45 Author: Site Editor Publish Time: 2024-10-23 Origin: Site
Butterfly valves are commonly used in various industries for controlling the flow of fluids.There are several types of butterfly valves,each with its unique installation process. The most common types include lug-style butterfly valves, wafer-style butterfly valves, and flanged butterfly valves. When installing a lug-style butterfly valve, ensure the valve is properly aligned and secured with bolts.For wafer-style butterfly valves, place the valve between flanges and use bolts to secure it in place.Flanged butterfly valves require aligning the valve with the piping system and using bolts to attach it securely. Proper installation of butterfly valves is crucial for efficient fluid control and system performance.
The butterfly valves can be used for a huge range of applications,including water supply,wastewater treatment,slurry services,fuel handling systems,vacuum service,fire protection, power generation,compressed air and gas application,chemical and oil industries,ships, refineries,and so on.Due to the wide range of butterfly valve applications,proper installation of the valve is vital so that they would work without any problem.In case of improper butterfly valve installation,many issues will arise,such as leaks,problems with flow, etc.The butterfly valve manufacturer produces a wide variety of butterfly valves in different models,and choosing the right design that fits the desired applications is essential.
To help people know the appropriate way to complete the butterfly valve assembly and install butterfly valves, below is the installation process:
1:Clean the pipeline of all contaminants.
2:Determine the direction of the fluid,torque as flow into the disc may generate higher torque than flow into the shaft side of the disc
3:Position disk in the closed position during installation to prevent damage of disc sealing edge
4:If possible,at all times the valve should be mounted with the stem in horizontal to avoid pipeline debris collecting at the bottom and for higher temperature installations
5:It should always be installed concentrically between flanges as mentioned above.This helps to avoid damage on the disc and eliminates interference with the pipeline and flange
6:Use an extension between the butterfly valve and wafer check valve
7:Try the disc by moving it from the closed position to open and back to ensure it moves flexibly
8:Tighten the flange bolts (tightening in sequence) to secure the valve following the manufacturers recommended torques
These valve designs integrate an offset as indicated by their name, made by the geometry design of the seating surface. The process of making it involves machining the seat into the offset profile.This feature facilitates frictionless stroking throughout the cycle.A contact is integrated at the final point of closure and mounted at 90° acting as the mechanical flow stop.
Based on the piping connection design,there are three different butterfly valve types,which are: wafer type butterfly valve,lug type butterfly valve,double flange butterfly valve,and butt-welded butterfly valves.The primary difference between lug type butterfly valve installation and wafer type butterfly valve installation is the way of attaching the bolts between the valve and flanges since the flanges’ location differs in each valve type.
When it comes to the disc closure design, there are two types of butterfly valves which are concentric butterfly valves and eccentric butterfly valves (single-offset butterfly valves, double-offset butterfly valves, and triple-offset butterfly valves).
Depending on the operation procedure of the valve, there are manual actuation butterfly valves (lever-operated butterfly valves and gear-operated butterfly valves) and automatic actuation butterfly valves (electric butterfly valves, pneumatic butterfly valves, and hydraulic butterfly valves).
Taking into account the different seat materials, there are two different butterfly valves, which are soft seated butterfly valves and metal seated butterfly valves.
Prior to installing the butterfly valves, it is beneficial to understand the following aspects related to these valves.
Ratings Of The Valve
The nameplate that is fastened to every butterfly valve specifies the pressure at which the valve is meant to be utilized. Prior to beginning the installation, verify the valve’s working temperature and pressure rating.
Valve Seat Location
Since the butterfly valves are entirely bi-directional, seat orientation is not necessary for installation. Installing with backflow prevention into the valve’s seat side is required for specific valve models. When the valve is oriented in this way, 25 to 150 psi across the valves will result in a bubble-tight cutoff.
Disc Clearance
Ensure that the ID of the tube and the flanges are big enough to permit the disc rim to slide into the opening freely before installing the valve. The performance of the valve might be significantly impacted by the deterioration of the disc edge.
Opening Rotation
Without endangering the valve or elastomer seat, the butterfly valve disc can revolve 360 degrees. The shaft can be rotated in either a clockwise or counterclockwise direction to open the valve.
Valve Location And Installation Position
The valve disc must be barely open but can not expand past the valve liner face in order to minimize damage to the disc and seat during installation.By placing the disc in the nearly closed position when installing the valve, seat interference and torque buildup will be lessened.Installing the durable butterfly valves with the shaft horizontally is preferred in most cases.The weights of the shaft and disc are uniformly distributed in this situation,reducing seat wear.Butterfly valves are often made to function between two flanges.A lug-style valve with the dead-end service function must be utilized if the valve installation only needs one pipe flange.If at all possible,butterfly valves have to be positioned at least six pipe diameters away from other line components.Though this is not always practical,it is still necessary to maintain the distance as far as possible.Make sure to leave a sufficient area between the butterfly valve and the check valve or tube where it is attached to make sure that the disc does not interfere with the nearby equipment.
Valve and Flange Preparation
Future issues can be prevented by properly preparing the valve and tube for installation.There should be no debris,dirt, grit,dents,or surface imperfections on any valve seat or pipe flange as they could interfere with flange sealing and result in outer leaks.Additionally, the sealing surface of the valve disc must be examined to remove any debris or foreign substances that could impair the valve’s functionality.
Tools For Installation
The only equipment needed to put in a butterfly valve is a wrench that can be used to tighten the flange bolts and screws that hold the valve in place. For assistance in manipulating valves 10″ and bigger, a hoist could be needed.Typically, smaller valves can be installed with ease in a short period of time.To help in valve installation,temporary line supports can be utilized to maintain the parallel alignment of flange faces.
Necessary Bolting
It is critical to understand the size, kind, and quantity of bolts required for butterfly valve installation. Ensure that you are aware of the best guidelines depending on pipe flanges that adhere to ASME 125/150 regulations.
Triple offset butterfly valves are the best option for power generation applications,and they’re the safest way to go for oil drill and petroleum refinery because they pose a minimal risk for leaks. Water treatment plants can also benefit from triple offset butterfly valves because they’re the safest,most leak-proof option.Whether or not your application needs ball valves or a triple offset butterfly valve depends upon whether a ball valve is enough to handle the job.If you’re not processing volatile materials that require different materials to prevent leaks,then you can save money by using a ball valve.On the other hand,if you pick a ball valve when you really require a triple offset butterfly valve,you’re putting your plant,your bottom line,and your employees’ safety at risk.To decide on the ideal valve,consider the viscosity,temperature and pressure levels of the substances you'll be processing.
