1. What are the advantages of flanged ball valves?

Flanged ball valve is a relatively new type of ball valve, and its own structure has some unique advantages, such as no friction to the switch, small wear on the seal, and small opening and closing torque.

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The flanged ball valve is equipped with a multi-turn electric actuator, and the medium can be adjusted. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc. Ball valve and gate valve belong to the same type of valve, the difference is that the closing part of the flanged ball valve is a sphere, which rotates around the center line of the valve body to open and close.

Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. A flanged ball valve is defined as a valve whose opening and closing member (ball) is driven by a valve stem and rotates around the stem axis.

The ball valve flange type and gate valve belong to the same type of valve, the difference is that its closing part is a ball that rotates around the centerline of the valve body to open and close.

The three-piece ball valve is a new type of valve that has been widely used in recent years. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. The V-shaped opening ball valve also has a good flow adjustment function.

Flanged ball valve has the following advantages:

1. The fluid resistance is small, and its resistance coefficient is equal to the resistance coefficient of the pipe section of the same length.

2. Simple structure, small size and light weight.

3. Tight and reliable. At present, the sealing surface material of flange type valve is widely made of plastic with good sealing performance, and it is also widely used in vacuum system.

4. Easy to operate, quick to open and close, just rotate 90° from fully open to fully closed, which is convenient for remote control.

5. Easy maintenance, simple structure of ball valve, generally movable sealing ring, easy disassembly and replacement.

6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the sealing surface of the valve will not be eroded when the medium passes through.

7. Wide range of applications, from a few millimeters to several meters in diameter, from high vacuum to high pressure.

'. Structural characteristics of flanged ball valve

1. No friction when opening and closing. This function completely solves the problem that the traditional valve affects the sealing due to the friction between the sealing surfaces.

2. Top installation structure. The valve installed on the pipeline can be directly inspected and maintained online, which can effectively reduce the downtime of the device and reduce the cost.

3. Single valve seat design. It eliminates the problem that the abnormal increase of medium pressure in the valve cavity affects the safety of use.

4. Low torque design. The specially designed valve stem can be easily opened and closed with a small handle.

5. Wedge-shaped sealing structure. Through the mechanical force provided by the valve stem, the ball wedge is pressed against the valve seat to seal the valve, so that the sealing performance of the valve is not affected by the change of pipeline pressure difference, and reliable sealing performance is guaranteed under various working conditions.

6. Self-cleaning structure of sealing surface. When the ball tilts away from the valve seat, the fluid in the pipeline passes through the sealing surface of the ball evenly at 360 degrees, which not only eliminates the local scouring of the valve seat by the high-speed fluid, but also washes away the accumulation on the sealing surface of the flanged ball valve. for self-cleaning purposes.

Flanged vs. Threaded Valve Connections

George Packard

Vice President of Marketing

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With many different types of valve connections available, it's important to choose the right one in order to connect your valves and pipes together to prevent leaks. When selecting the best valve connection type for your process components and piping systems, there are several different categories of valve connection types to consider.

Two of the most widely used valve connections are flanged and threaded, and each type serves a specific purpose depending on the application in which it is being used.

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Read on to learn more about flanged vs threaded valve connections and which offers the best alternative for your specific application.

What Are Flanged Connections?

In piping systems, a flange is a projecting rim or collar on a pipe or pressure vessel used to create a sealable joint with another flange pipe or pressure vessel. Many types of flanged connections require welding or gasket bolting to hold the pipe fittings together. However, some other types of this ring-shaped device offer alternatives to welding and can be easily disassembled for shipping, routine inspection, maintenance and replacement.

Flanged valve connections are commonly used in applications with:

• Large pipe sizes
• High-pressure
• Jobs that call for high joint integrity

Some of the most common types of flanged valve connections include:

• Blind flange: used to close the end of a pipe or to close a pipeline to prevent leakage or flow
• Lap joint flange: used by slipping over a pipe, which enables it to swivel around the pipe and facilitate the lining up of opposing flange bolt holes
• Slip on flange: used frequently in the pipes, valves and fittings (PVF) industry and connects via two filet welds
• Socket weld flange: used by attaching a socket weld joint to the pipe
• Threaded flange: used frequently in smaller piping systems and includes a threaded connection inside the flange bore, which does not require welding
• Weld neck flange: used to prevent turbulence and increase flow by precisely matching the inside diameter of the pipe

Flanges can be made from standard materials such as stainless steel and carbon steel or from more specialized materials designed for specific jobs. Flanged connection subtypes include:

• Flat face
• Raised face
• Ring joint face
• Tongue and groove
• Male & female

Flanged valve connections can deliver many benefits when used appropriately. For example, flanged connections:

• Allow piping spools to be assembled without welding
• Can be manufactured in many different piping spool formats
• Do not require painting/blasting

Although flanged connections can be advantageous when used under the right circumstances, they may also present some limitations. For example, flanged valve connections:

• Are expensive when used to insulate flanged pipes
• Require more space
• Are more prone to leaks

What are Threaded Connections?

Unlike flanged connections, which utilize multiple parts to fit piping components together, threaded connections are fitted with matching grooves (one set of grooves on the outside and the other on the inside).

Threaded connections are considered one of the oldest forms of joint connections, and they are still very popular today, as they allow for a more compact and efficient connection between pipe and valve.

Most threaded valve connections include a female threaded end connection that easily connects to a male threaded pipe. However, some of these devices are fitted with male threaded connections as well. Some even include both male and female threaded connections on either end.

Threaded valve connections are commonly used in a wide variety of applications and are particularly popular in applications with smaller pipe sizes (3' and under).:

Some of the most common types of threaded valve connections include:

• NPT: National pipe thread tapered, the US standard for tapered threads used in pipes and fittings, which pulls tight to make a fluid-tight seal.
• NPS: National pipe straight, a standard for straight (non-tapered) threads used in pipes and fittings that, similar to BSPP, requires a gasket or sealant to ensure a fluid-tight connection.
• BSPT: British standard pipe taper threads that include tapered threaded connections and a 55-degree angle of the thread flanks, which does not allow for a fluid-tight seal.
• BSPP: British standard pipeline threads, which do not create a fluid-tight seal on its own but rather pull together two threaded mating parts.

Threaded valve connections are typically available in two subtypes:

• Male vs. female
• Straight vs. tapered

There are several advantages to using this type of valve connection. Threaded valve connections:

• Are quick to install
• Are suitable for low-medium pressure applications and certain high-pressure applications
• Generally require less space than flanged connections
• Are relatively inexpensive

While they can be the right choice in certain applications, threaded valve connections may have some drawbacks. A few notable disadvantages are that threaded valves:

• Are not usable in very high temperature or very high-pressure applications
• Are not as easy to disassemble and service as flanged connections
• May be less foolproof to install as they can be over or under-tightened during installation or maintenance

What is the Price Difference Between Flanged and Threaded Connections?

When it comes to cost, threaded valve connections generally cost substantially less than flanged valve connections. The difference in cost between the two connection types is due to the multiple parts and various structures of flanges. However, despite the cost-savings associated with threaded valve connections, they offer less operational flexibility and are primarily only useful in low-pressure piping systems.

Ready to get started on your next utility project? Check out our guide to Valve Actuators to make sure you're on the right track.

George Packard

Vice President of Marketing

George Packard, Vice President of Marketing at Gemini Valve, has been involved in Technical Sales and Marketing in the valve industry for over 10 years. George's varied experience includes communicating with clients to troubleshoot critical applications, and working alongside top engineers in the industry to promote the latest innovations in automated ball valve design.

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