Flanged Check Valve: The Ultimate FAQ Guide

If you have any questions about the flanged check valve, you will find the answer right here.

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.

What is a Flanged Check Valve?

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

Flanged Check Valve

What are the Parts that Make up a Flanged Check Valve System?

The following are the parts of a flanged check valve system:

  • Body
  • Bonnet
  • Ports
  • Handle
  • Disc
  • Seat
  • Stem
  • Gaskets
  • Valve balls
  • Packing
  • Gland nut

The numbers labeled in the diagram above represent parts as follows;

  1. Body
  2. Ports
  3. Seat
  4. Stem
  5. Disc
  6. Handle
  7. Bonnet
  8. Parking
  9. Gland nut
  10. Fluid
  11. Disc position (valve closed)
  12. Handle position (valve closed)

What is the Purpose of a Flanged Check Valve?

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.

How does Flanged Check Valve Work?

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.

What are the Typical Applications for Flanged Check Valve?

The common uses of flanged check valve include:

  • Water pumps
  • Sewage pipes
  • Oil processing
  • Petroleum transport lines
  • Chemical industries
  • Food processing

What are the Features of a Flanged Check Valve?

The typical properties of flanged check valve include:

  • Availability of balls with a different weight ensures silence during the process.
  • The high pressure at the input and low pressure at the output makes it open and close easily for easy control of fluid
  • It is small and light. This makes it easy to disassemble and assemble.
  • It is one way thus ensures little chances of backflow.
  • Closing ability protects the piping process to avoid contamination.

What are the Benefits of the Flanged Check Valve?

Here are some of the advantages of a flanged check valve:

  • It is a solution to the numerous projects that revolve around fluid
  • Prevents backflow of fluid
  • Minimizes chances of corrosion of the system since its tightness prevents leakage.
  • It has a low cost of maintenance since it has a self-cleaning mechanism
  • Easy to install
  • It is cheap and locally available thus easily accessible.

Threaded Flanged Check Valve

Threaded Flanged Check Valve

What are the required End Connection Standards for Flanged Check Valves?

The End connection for Flanged Check Valves should meet various standards.

They comprise of:

  • ANSI/ASME B16.5
  • DIN 1092-1/ISO7005(Diameter Nominal.)

Based on size and pressure rating.

SAE J518

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.

What is the Flanged Check Valve Method of Control?

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.

What are common Body Materials for Flanged Check Valves?

The common materials used to make Flanged Check Valves consist of:

  • Brass
  • Lead
  • Steel
  • Iron
  • Silicone
  • CPVC

What is the Mounting Orientation of Flanged Check Valves?

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;

  • Horizontal
  • Vertical
  • Horizontal and vertical

What are the Design Options for Flanged Check Valves?

There are different flanged check valve designs.

The designs are suitable for all the various needed aspects of the process flow, and they include:

  • Disc check
  • Spring Check
  • Swing Check
  • Double-Check
  • Piston Check
  • Ball Check
  • Foot Valve
  • Y-Pattern
  • Axial Disc Check

 Flanged Ball Check Valve

Flanged Ball Check Valve

How do you Size Flanged Check Valves?

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.

What are the TemperatureConsiderations for Flanged Check Valves?

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.

What is Flanged Check Valve Pressure Rating?

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.

What is the Best Material for Flanged Check Valve Seal?

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.

How Much do Flanged Check Valve Cost?

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.

What are the Coating Options for Flanged Check Valves?

There are various coating options for the Flanged Check Valves, which include:

  • Epoxy Coatings
  • Alkyd Coatings
  • Zin-Rich Coatings
  • Acrylic Coatings
  • Polyurethane Coatings

Why is Valve Flow Coefficient Important in Flanged Check Valves?

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.

Are Flanged Check Valves Suitable for Drinking Water Applications?

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.

How do you Choose Flanged Check Valves?

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

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.

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.

What are the Disadvantages of Flanged Check Valves?

Despite their advantages, there are various disadvantages of flanged check valves that comprise of:

  • The internal parts cannot be checked
  • Disks can get stuck in the open position
  • Noise from slamming disks cause discomfort
  • Issues of water hammer
  • They only operate in a completely closed system
  • They can abruptly close thus causing damage and wear

What does the Arrow Cast into the Flanged Check Valve Body Indicate?

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.

Where should you Install a Flanged Check Valve on Water and Well System?

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

Flanged Check Valve Installation

How do you Install Flanged Check Valves?

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.

What are the Common Signs of Flanged Check Valves Failure?

Flanged Check Valves can exhibit failure in ways such as;

  • Pump runs but very little fluid. It indicates a problem of low pressure in the process flow thus little fluid.

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.

  • The pump runs but does not pump water. This might be due to a blockage or much leakage. It can also result from a low-pressure supply in the system.

Changing the Valve or adjusting it should help fix this.

Increasing inlet pressure would also help a lot.

  • Disturbing noise caused by the Check valve friction. You should regularly check the valve and replace parts to make the flowing process easy.
  • Pump keeps running nonstop. This indicates a problem with the nut which might be loose.

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.

  • Iron clogged Check Valves. This is a clear indication corrosion caused by leakage of fluid. The Valve nut should be efficient and fitting to ensure complete shut off that ensure zero leakage.
  • Pump opens and closes frequently. This is due to the insufficient supply of pressure in the system. The input and out pressure required is probably not balanced.

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.

Do Flanged Check Valves require Periodic Maintenance?

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

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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