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What Are Overview of Valve and Pipeline Connection Methods?

What Are Overview of Valve and Pipeline Connection Methods

Valves, as indispensable control elements in fluid piping systems, are connected in a variety of ways to suit different application scenarios and fluid characteristics. The following are common connection forms of valves and their brief description:

1. Flange connection

The valve is connected to the pipeline by paired flanges and bolt fasteners, suitable for high temperature, high pressure and large diameter piping systems.

Advantages:

Firm connection, good sealing, suitable for high pressure, high temperature and corrosive media and other harsh conditions of the valve connection.

Easy to disassemble and repair, convenient to maintain and replace the valve.

Disadvantages:

Installation requires more bolts and nuts, higher installation and maintenance costs.

Flange connection is relatively heavy and takes up more space.

Flange connection is a common type of valve connection, and its standards mainly include the following aspects:

Flange type: according to the shape of the connection surface and sealing structure, flanges can be divided into flat welding flanges, butt welding flanges, loose set flanges and so on.

Flange size: the size of the flange is usually expressed in terms of the nominal diameter of the pipeline (DN), and the size of the flange may vary from one standard to another.

Flange pressure level: the pressure level of flange connection is usually expressed by PN (European standard) or Class (American standard), and different levels correspond to different working pressures and temperature ranges.

Sealing surface form: the sealing surface of flanges has various forms, such as flat surface, protruding surface, concave-convex surface, tongue-and-groove surface, etc., and the suitable sealing surface form should be selected according to the nature of fluid and sealing requirements.

2. Thread connection

Using internal and external threads to tightly screw the valve to the pipeline, mainly applicable to small diameter, low pressure pipeline system.

Advantages:

Simple connection, easy to operate, no need for special tools or equipment.

Suitable for small diameter valves and low pressure pipeline connection, low cost.

Disadvantages:

Relatively poor sealing performance, easy to leak.

Only suitable for low pressure and low temperature conditions, for high pressure and high temperature environment, threaded connection may not meet the requirements.

Threaded connections are mainly used for small-diameter valves and low-pressure piping systems, and their standards mainly include the following aspects:

Thread type: Commonly used thread types are pipe thread, cone pipe thread, NPT thread, etc. The appropriate thread type should be selected according to the pipe material and connection requirements.

Thread size: The size of the thread is usually expressed in nominal diameter (DN) or pipe diameter (inch), and the thread size may be different in different standards.

Sealing material: To ensure the sealing of the connection, sealants are usually applied to the threads or sealing materials such as sealing tapes are used.

3. Welded connections

The valve is directly welded to the pipe through the welding process, which is suitable for scenarios that require a high degree of sealing and a permanent connection.

Advantages:

High connection strength, good sealing, corrosion resistance, suitable for scenarios requiring permanent and high sealing, such as piping systems in petroleum, chemical and other industries.

Disadvantages:

Requires specialised welding equipment and operators, high installation and maintenance costs.

Once welding is completed, the valve and pipe will form a whole, not easy to disassemble and repair.

Welded connections are suitable for scenarios that require a high degree of sealing and a permanent connection, the criteria for which mainly include the following aspects:

Weld type: common weld types include butt weld, fillet weld, etc. The appropriate weld type should be selected according to the pipe material, wall thickness and connection requirements.

Welding process: the choice of welding process should be based on the parent material material, thickness and welding position and other factors to ensure welding quality and connection strength.

Welding Inspection: Necessary inspections and tests, such as appearance inspection and non-destructive testing, should be carried out after the welding is completed to ensure the welding quality and the sealing of the connection.

4. Socket connection

One end of the valve is socket, the other end is socket, through the insertion and sealing to connect, commonly used in plastic piping systems.

5. clamp connection

Both sides of the valve have clamping device, through the clamping device will be fixed on the pipeline, suitable for rapid installation and dismantling occasions.

6. Ferrule connection:

Ferrule connection is usually used in plastic piping system, through the special ferrule tool and tube fittings to achieve the connection of pipeline and valve. This type of connection has the characteristics of easy installation and easy disassembly.

7. Bonding connection

Bonding connection is mainly used for some non-metallic piping systems, such as PVC, PE and other pipes. Through the use of special adhesive will pipe and valve bonded together to form a permanent connection.

8. Clamp connection

Often referred to as groove connection, this is a quick connection method which requires only two bolts and is suitable for low pressure valves that are frequently dismantled. Its connection fittings include two categories of products: ① connection sealing fittings are rigid joints, flexible joints, mechanical tee and groove flange; ② connection transition fittings are elbow, tee, cross, reducer, blind and so on.

 

Summary

Valve connection form and standard is to ensure safe and reliable operation of the valve and piping system is an important factor. In selecting the appropriate connection form, should consider the pipeline material, working pressure, temperature range, installation environment and maintenance requirements and other factors. At the same time, in the installation process should follow the relevant standards and norms to ensure the correctness of the connection and sealing to protect the normal operation of the fluid piping system.

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