If you have any questions about the flanged check valve, you will find the answer right here.
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From parts, working principle, end configuration, material type, surface finish to features &#; all information you need is in this guide.
So, if you want to be an expert in flanged check valve, keep reading.
A Flanged Check Valves a valve designed for the purpose of isolating media as it flows through the piping system.
It performs this function through its ability to open and close simultaneously.
The media can be liquid and gas.
Flanged Check Valve
The following are the parts of a flanged check valve system:
The numbers labeled in the diagram above represent parts as follows;
The main role of a Flanged Check Valve is to control the flow of fluid in a piping system.
This occurs through the valve opening and closing.
Its design enables it to prevent leakage through its complete closure.
This enhances zero percentage of corrosion of the system at hand.
The fluid in this case commonly refers to liquid and gas.
Other fluids include fluidized solids and slurries.
The valve is designed to control the flow of fluid in the piping system.
It does this by opening, closing, or partially blocking various passageways in the process flow.
The position of the disc and handle changes depending on whether the valve is open or shut.
The valve moves down to block the flow of fluid.
The flowing fluid then pushes it up, making it open.
It basically checks the fluid flow in one direction.
It requires a higher pressure on the input side and a lower pressure on the output side to open.
When the pressure on the output side is higher than that of the input side, the Check Valve closes.
The common uses of flanged check valve include:
The typical properties of flanged check valve include:
Here are some of the advantages of a flanged check valve:
Threaded Flanged Check Valve
The End connection for Flanged Check Valves should meet various standards.
They comprise of:
Based on size and pressure rating.
Based on using four bolts located on the corners of the rectangle.
They can be split into two halves or left as a whole.
They are slim in nature.
This connection type makes them simply squeeze the valves between two flanges using long bots or threaded end rods.
The Flanged Check Valve is basically controlled by the difference in pressure.
It requires a higher pressure on the input side and a lower pressure on the outlet side to open.
When the pressure on the output side is higher than that of the input side, it closes to prevent backflow.
It controls the flow of fluid in the piping system by opening, closing or partially blocking various passageways in the process flow.
The position of the disc and handle changes depending on whether the valve is open or shut.
A build-up of pressure on the output side could result in failure of the valve and the whole flow at large.
The common materials used to make Flanged Check Valves consist of:
You should mount the valve in the right direction to prevent backflow and enhance the proper running of fluid.
The valve housing often has an arrow indicating the right direction of flow.
Fixing the valve in the wrong direction causes backflow of the fluid.
A backflow is inconvenient and causes damage to the fluid and also the pipes.
The pipes might corrode and wear out. Backflow also causes contamination of the clean fluid.
The correct mounting directions of the flanged check valve are;
There are different flanged check valve designs.
The designs are suitable for all the various needed aspects of the process flow, and they include:
Flanged Ball Check Valve
The selected Check Valve should have the right size.
In order to do this, you should determine the minimum velocity required to lift the disc of the valve.
Then, find the mean velocity of flow in the piping system.
The mean velocity should be greater than or equal to the minimum required velocity.
The accuracy of determining the right size comes with various advantages evident in usage.
During the selection of the flanged check valve, you should consider the external temperature as well as that of the medium in question.
It should resist the high temperature of the medium for efficiency.
If it cannot withstand the high temperature, it might burst to cause leakage of the medium, hence corrosion of the pipes.
The material should be compatible with the medium.
The best material recommended is Viton, since it withstands all the conditions.
It is possible to use this material in all flow situations, including those that no other material type could be used.
The maximum and cracking pressure in the Flanged Check Valve basically makes the valve work.
The cracking pressure refers to the least pressure needed to push the valve open and allow the fluid to flow through.
The inlet pressure should be higher than the outlet pressure to ensure that it does not flow back and cause contamination.
Flanged Checking Valve should be strong enough to withstand or resist the maximum and cracking pressure of the media.
VITON is the best and recommended material for Flanged Check Valve Seal.
This is because it resists all the harsh and tough conditions of both the media and pipe.
It can withstand high temperatures as well as very low temperatures without melting or freezing out.
This a feature that makes it stand out from other materials.
The material is able to withstand the cracking pressure; the pressure needed to open and close the valve in a simultaneous way.
Normally, you use Viton seals in applications where nothing else could work.
The cost of Flanged Check valves is relatively cheap.
The cost somehow depends on the material used to make the Valve.
Moreover, the complexity of the Check valve matters too.
A simple Flanged Check Valve costs less than a complex one.
The average price ranges from $35-$600.There is also a cost of professional labor.
Basically, the valves that cost higher have better quality and this indicates that they last for a longer period of time.
These are better than those that cost less and last for a shorter time.
There are various coating options for the Flanged Check Valves, which include:
The coefficient Valve Flow in Flanged Check Valves ensures that fluid does not flow back.
The backflow of fluid could lead to contamination of the clean fluid.
For example, in a water sewer plant, there is a need to prevent sewage from flowing back into the pipe.
It would be bad if it flows back and contaminates the clean water.
The coefficient flow ensures that this never happens.
What enhances this is the pressure of the fluid that opens the valve.
If this pressure reduces, the valve automatically closes preventing the fluid from flowing back.
The pressure at the input part should be higher than the outlet pressure.
The pressure difference ensures that the fluid does not flow back and cause contamination.
No, the Flanged Check Valves are primarily designed for wastewater.
They are instrumental in ensuring that used water does not flow back into the system as this could contaminate clean water.
However, Swing Check Valves are the best-suited type of Valves for drinking water.
Choosing a suitable Flanged Check Valve means a perfect process system.
You need to select the valve after thorough consideration of various factors.
Axial Double-Disc Flanged Check Valve
Here are the factors to consider when choosing Flanged Check valves;
a) Material: It should be compatible with the medium.
b) Size: The size for connection points should align with that of the Flanged Check Valve.
c) Maximum pressure and cracking pressure requirement: The Flanged Check Valve chosen should withstand the pressure of the medium.
d) Installation requirement: This depends on whether the installation should be horizontal or vertical.
Want more information on Flanged Ball Valve? Feel free to contact us.
e) Accessibility needs for inspections and repairs: Readily available Valves should be chosen over rear ones. Those that are easily accessible are easily reached during inspections and repairs.
f) Temperature: The Flanged Check Valve should be able to withstand the external and media temperature.
The right Flanged Check Valve withstands all aspects of the media.
A valve with good material is reliable because it resists high temperatures as well as pressure.
Despite their advantages, there are various disadvantages of flanged check valves that comprise of:
It indicates the right way in which you should install the flanged check valve.
Basically, it should be connected based on the direction in which the medium flows.
A change in this messes up with the general functionality of the valve.
In the long run, the valve might fail to work thus the process flow will break down.
This damages the whole system as well as the medium.
To avoid such cases, you should observe the correct arrow direction and other given instructions.
The Flanged Check Valve should ideally be put between the water pipe and the tank or pump.
Simply put, it should connect the pipe to the tank or pump with its handle at a reachable point.
This allows for easy turning on or off by the user.
You should do this with the correct direction of the water flow in mind.
The size of the valve should suit the size of the pipe.
This makes it perfectly fit for the task and very efficient.
Flanged Check Valve Installation
During installation, it is important to use the right size of the Check Valve on the pipe in question.
An arrow on the Valve housing should always guide one to install the Valve.
The arrow marks the direction in which the fluid flows and you should install it in that same direction.
A change in direction could lead to failure of the process flow.
Flanged Check Valves can exhibit failure in ways such as;
You can solve this by checking the inlet pressure. In this case, the Flanged Check Valve is definitely obliged to automatically close if this continues.
Increase the inlet pressure to enhance a continuous flow without interruption.
Changing the Valve or adjusting it should help fix this.
Increasing inlet pressure would also help a lot.
Correct this by tightening the nuts.
It is also advisable to check the inlet pressure to ensure it is higher than that of the outlet.
If the pressure at the outlet is more, the valve closes.
Therefore, to solve this, the input pressure should be higher than the output pressure.
Make sure you maintain this pressure difference.
Yes, there is a need to periodically maintain the Flanged Check Valveto enhance the efficient flow of fluid.
Although it features a self- cleaning mechanism, it does not mean that it will stay in good working condition throughout by itself.
Maintenance ensures zero leaks.
It also enhances the required amount of fluid flow with the required pressure.
Poor maintenance could lead to problems with the flow system, contamination of the clean fluid, and even failure of the complete system.
Therefore, prevention helps avoid major issues that could inconvenience the process flow.
Flanged Check Valve Cross-Section
In order to function efficiently, you need to maintain Flanged Check Valves well.
It is important to keep the valves clean and taking steps to prevent damage to the valve system.
You should do a regular inspection of the equipment to ensure it is in good working condition.
Keep the valve clear for easy opening and closing.
Remove anything external that may cause blockage.
Furthermore, make sure to replace handles and other parts of the flanged check valve from time to time.
This makes the Check Valve efficient and remains in good working condition.
A bad working condition causes the build-up of pressure on the outlet side of the flow system.
This in turn causes great damage and wear.
It might also cause a backflow of the fluid that leads to contamination of the clean fluid.
Moreover, it is also advisable to keep the valve lubricated to avoid friction and eventual wearing out.
Friction also causes noise.
Frequent coating by applying the protective insulation is important.
This helps prevents corrosion of the equipment.
Still, if you have any questions on the flanged check valve, Kinvalve is here to help.
We design and produce a range of flanged check valves depending on your unique requirements and specifications.
Contact us now for all your flanged check valve needs.
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Pressure Class/Ratings for small, non-flanged valves
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MVPs
(Mechanical)
(OP)
7 Jun 16 16:49I fully understand the pressure classes that are used for flanged valves (per ASME B16.5: Class 150, 300, 600, 900, , ). It makes a ton of sense to me. You have a pressure and temperature of the piping system, you go to ASME B16.5, you look up the pressure class corresponding to the pressure/temperature in the appropriate table, and you specify a valve with that pressure class and it works for any flanged valve, no matter the type (ball, gate, globe, etc..). No ambiguity. No confusion.
For smaller, non-flanged valves (threaded and socket welded), I am VERY confused what the pressure classes are, who (what organization) determines/defines them, how an engineer determines the appropriate class for a particular valve, and which pressure classes apply to which types of valves. Can someone explain it to me? My company has options to specify smaller valves with the following pressure classes (please forgive nomenclature/symbology errors, I'm literally copying these from a company P&ID legend): 800# API, # API, # API, # API, # API, # API, # API, # WOG, # WOG, # WOG, # WOG, # ANSI.
Some of these might apply only to ball valves, others only to gate valves (for example) and I just don't understand the rhyme or reason. I also don't understand at what pressure/temperature I need to switch from using a # WOG ball valve to a # WOG ball valve, for example. Or when I need to switch from a 800# API gate valve to a # API gate valve. Is there a chart somewhere similar to what is found in B16.5 for flanged valves?
Any help would be appreciated!
Replies continue below
(Mechanical)
7 Jun 16 21:02I don't know about WOG flanges but API equipment is rated for full working pressure across its entire temperature range based on temperature class. If you have a # API Temp class P-U flange it is good for PSI from -20F-250F. API temperature classes are listed in their respective API Standard, which for flanges is usually 6A.
2
moltenmetal(Chemical)
8 Jun 16 12:55You need to go to the manufacturers' literature for each valve and look at the pressure-temperature rating curves.
Small socket welding and threaded gate and globe valves (i.e. 4" NPS and below, but typically 2" NPS and below per API 602) have ratings based on their body class- as long as the correct seals and packing are used. They start at 800# class. Yes, there's a P/T chart in API 602.
Ball valves have ratings entirely dependent on the soft goods used for their seats. Seat and seal materials determine the pressure rating at elevated temperature, and will determine when you must switch from a WOG to a WOG valve etc. at elevated temperature. Below about 100 F, the WOG rating is the safe allowable working pressure in psi irrespective of the seats and seals used.
(Petroleum)
12 Jun 16 21:56I agree it's very odd and confusing, but there is some method.The ASME flange and valve class ratings ( basically the same thing) are pretty clear.The API ratings are similarly clear as they are psi ratings as defined in API 6A. I've never seen anything less than API .Small ball valves and screwed fittings are often seen as rated as cost difference is small and it means they are pretty meaty.WOG is Water Oil Gas and is an older term not really well defined except in vendor literature, but commonly means that pressure in psi at ambient conditions up to about 50C.# ANSI is a bit odd and doesn't really compute.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
(Mechanical)
27 Jun 16 03:30Small socket and butt weld valves are usually to API602 class 800. API602 has a pressure/temp tables like the flanged valve codes do.
(Industrial)
19 Jul 16 16:58 little late to this rodeo; however, here is a FREE eBook onI may be alate to this rodeo; however, here is a FREE eBook on ANSI Class Ratings for Valves . I hope it helps. There is some valuable information in the eBook and there are some helpful ANSI charts for valves as well. Hope it helps; let me know.
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