Flanged or threaded ends - Valve engineering - Eng-Tips

There are other more complex issues between the differences in threaded and flanged valves. Typically flanged valves are used for high pressure and temperature due to better sealing. There are too many unknowns with threaded valves, when I spec a SS valve I do not allow threads due to galling, I use only flanged or butt weld valves on hazardous fluids.
The pressure and temp rating of threaded and flanged valves are different. A threaded valve is rated on a different bases then flanged valves. A threded valve may have a rating of psig WOG this means it is good to psi at 100deg F, the ratings for threaded valves are 800, , , , and psig. I should also indicate that the WOG stands for Water Oil Gas service valves and is a standard relating to testing. Now as for flanged valves they follow the ASME B16.34 pressure temperture ratings for pipe flanges i.e. a class 150 A105 flange has a rating of 285 psi at 100 deg F (I think). To make the whole thing more complicated the ratings given for the valve body thickness or end connection ratings are usually based on ASME A16.34 and actually matbe misleading. At higher temperatures it is the seat and gasket material which will dictate the pressure temperture rating, as a rule of thumb if the temp is over 450F you best check the seat material rating. One last difference between the valve end types is the selection of the material of construction which may also vary for a given manufacture based on size. They may only sell a WCB body in the threaded model and only handle up to 2", but have a wide range of flanged valve materials in all sizes. This maybe an issue in selecting your vendor.
As for porting a full port valve has basically the same pressure drop as sch 40 pipe, a reduced port valve can have 5-7 times the pressure drop. I'm a visitor,

Well, as a process engineer, I typically don't really care if you pick a reduced port or full port valve. The pressure drop across either, which is what I'm usually concerned with, is relatively small compared to all the piping I'm putting in. This isn't always the case, sometimes if dP is a problem, I will specify a full port valve but for regular piping, this is pretty rare.

Some exceptions:

Inlet valves and outlet valves on PSVs are typically specified as full port due to concerns with pressure drop.

Pipeline valves are typically specified as full port valves to allow pigs to go through them.

Other than those, the most common use for full port valves is if you are hot tapping through them. You want the biggest port you can since the tool you are using to cut through the pipe has to fit through the valve.

When selecting a valve or pipe connection, one of the first choices you’ll face is flanged vs. threaded. Each option has distinct benefits and limitations, making it crucial to choose wisely based on your application. If you’re dealing with high-pressure industrial systems, a flanged connection might be best. If you need a simpler, cost-effective solution for low-pressure applications, a threaded connection could be the better choice.

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This guide will break down their key differences, advantages, and best-use cases to help you make an informed decision.

Understanding Flanged Connections

A flanged connection is a method of joining pipes or valves using a flange, a ring-like structure with bolt holes that allow secure fastening. It is commonly used in industrial ball valves and high-pressure systems where reliability and strength are crucial.

Advantages of Flanged Valves

• Stronger and More Durable: Flanges create a tight, secure seal suitable for high-pressure and high-temperature systems. 
• Easy Maintenance: Since flanged valves can be detached without cutting pipes, they allow for easier repairs and replacements. 
• Better for Large Pipe Sizes: Ideal for pipelines with large diameters that require enhanced stability. 
• Leak Prevention: Gaskets between flanges improve sealing, reducing the risk of leaks.

Disadvantages of Flanged Valves

• More Expensive: The materials and installation costs are higher compared to threaded valves. 
• Requires More Space: Flanged connections take up more room due to their size and bolting requirements. 
• Labor-Intensive Installation: Proper alignment and torquing of bolts are required to ensure a leak-proof seal.

Best Use Cases:

• High-pressure and high-temperature industrial systems: Suitable for extreme conditions where durability and leak resistance are crucial.
• Oil, gas, and chemical industries: Commonly used in pipelines requiring robust connections to handle hazardous substances.
• Applications requiring frequent maintenance: Ideal for systems where easy disassembly and reassembly are needed for regular inspections or repairs.

Understanding Threaded Connections

A threaded connection involves screwing a valve directly onto a pipe using threads. These are commonly used in low-pressure applications and systems where cost and simplicity are the priority.

Advantages of Threaded Valves

• Lower Cost: Threaded valves are generally more affordable compared to flanged alternatives. 
• Compact and Space-Saving: Suitable for tight installations due to their smaller size.
• Quick Installation: No special tools or welding are required, making it a fast and easy option. 
• No Additional Sealing Components Needed: Properly threaded connections create a pressure-tight seal without gaskets.

Disadvantages of Threaded Valves

• Weaker Compared to Flanges: Not suitable for high-pressure or high-vibration environments.
• Difficult to Maintain: Dismantling a threaded system often requires cutting pipes, making maintenance more complex.
• Potential Leakage Risk: Threaded connections may loosen over time, leading to leaks.

Best Use Cases:

• Residential plumbing and HVAC systems: Ideal for applications requiring simple and quick installations with minimal maintenance.
• Small-scale industrial applications: Suitable for systems operating under low to moderate pressure.
• Temporary or low-pressure pipe connections: Best for non-permanent setups that need easy dismantling and cost-effective installation.

Flanged vs. Threaded: Side-by-Side Comparison

This section provides a clear comparison between flanged and threaded connections, outlining key factors such as cost, durability, installation, and maintenance. Use this table to quickly identify which connection type best suits your specific needs.

FAQs: Flanged vs. Threaded

1. Which is stronger, flanged or threaded connections?

Flanged connections are stronger and more durable, making them ideal for high-pressure and high-temperature applications.

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2. When should I use a flanged connection?

Use flanged connections when working with industrial ball valves, large-diameter pipes, or systems requiring frequent maintenance.

3. Are threaded connections leak-proof?

Threaded connections can provide a secure seal, but they are more prone to loosening over time, which can lead to leaks.

4. Which is more expensive, flanged or threaded valves?

Flanged valves are generally more expensive due to their materials, bolting, and gasket requirements.

5. Can I replace a threaded valve with a flanged valve?

Yes, but it requires modifying the piping system to accommodate the flange’s bolted connection.

Conclusion: Why Choose Onero Valve?

At Onero Valve, we manufacture high-quality industrial ball valves designed to meet various industry standards. Our expertise in both flanged and threaded valves ensures that you get the best solution for your specific needs.

Why Choose Onero Valve?

• Diverse Product Range: We offer a wide selection of flanged valves and threaded valves for multiple applications. 
• High Manufacturing Standards: Our valves meet ISO, API6D, and CE certifications for quality assurance. 
• Customization Options: Need a specific material or design? We provide tailor-made solutions to match your requirements. 
• Reliable & Long-Lasting: Our products are built to withstand high pressure, corrosion, and extreme conditions.

Whether you need a flanged connection for industrial-grade durability or a threaded connection for quick and easy installation, Onero Valve has the perfect solution for you.Explore our product range and get in touch today at www.onerovalve.com!

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