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Inspecting Internal Leakages of Buried Ball Valves

Inspecting Internal Leakages of Buried Ball Valves

Buried ball valves are a type of valve used in various industries to control the flow of fluids. They are called "buried" because they are typically installed underground, making them ideal for applications where space is limited, or aesthetics are important. These valves consist of a hollow ball with a hole in the center, which acts as the flow control mechanism. One of the main...

Internal Leakages of Ball Valves in Gas Transmission Stations

Internal Leakages of Ball Valves in Gas Transmission Stations

Ball valves are an essential component in gas transmission stations, and their importance cannot be overstated. These valves play a crucial role in regulating the flow of gas, ensuring safety, and preventing potential disasters. Firstly, ball valves offer superior control over the flow of gas. Their design allows for quick and precise adjustments, enabling operators to regulate the pressure and volume...

Basic Design Requirements for Spent Fuel Reprocessing Process Valves

Basic Design Requirements for Spent Fuel Reprocessing Process Valves

(1) Radiation resistance of the valve The material and structure of the valve should be considered in the design to meet the requirements of radiation resistance. The valve body is made from stainless steel which is consistent with the pipe material. Stainless steel meets the requirement for radiation resistance. The material selection of other parts of the valve requires radiation resistance and...

Selection and Design of Valves for Spent Fuel Reprocessing

Selection and Design of Valves for Spent Fuel Reprocessing

3.1 Selecting valves For the selection of spent fuel reprocessing valves, it is necessary to ensure their safety, reliability, functionality, operability and economy. First, clarify the requirements for the safety of the valve according to the requirements of the process system, such as safety level, anti-seismic category and quality assurance level. Second, clarify the material, use and type of the...

Online Detection of Internal Leakages of Ball Valves

Online Detection of Internal Leakages of Ball Valves

1. Overview The ball valve is a device used to cut off, distribute and change the flow direction of the medium. Its opening and closing part is a sphere, which is opened and closed by rotating the sphere at an angle of 90 around the axis of the valve stem. During the operation of the gas transmission pipeline, the internal leakage of the ball valve will bring great trouble to the process operation,...

Measures to Prevent Internal Leakages of Valves

Measures to Prevent Internal Leakages of Valves

Measures to prevent internal leakages of valves are as follows: 1. Flushing the pipe During valve inspection, it is common to find scratches on the valve. During the operation of power plant units, it is often found that the valve does not leak before opening, but leaks occur during operation, which are all caused by impurities in the pipeline. For example, valves are closed during operation for water...

The Internal Leakage of the Thermal Power Plant Valve

The Internal Leakage of the Thermal Power Plant Valve

In the development of thermal power plants, the internal leakage of the thermal system valves directly affects the development. Therefore, thermal power plants should actively know the causes of internal leakage of valves in the production process. Before production, timely check the corresponding equipment to clean up the dirt existing in them to ensure the automation of thermal power plant valves....

A Kind of Repair Technology for Check Valves (Part Two)

A Kind of Repair Technology for Check Valves (Part Two)

2.2 Technical schemes and working methods of sleeve components of check valves 2.2.1 Technical solutions The valve sleeve components provided in the check valve mainly include the valve sleeve cover plate, guide tube, guide rod, valve sleeve, valve core and other parts (Figure 5). Valve sleeves(7) are set in the valve body of the check valve, and the sealing surface between the...

A Kind of Repair Technology for Check Valves (Part One)

A Kind of Repair Technology for Check Valves (Part One)

Abstract During the use of traditional horizontal lift check valves, problems such as damage to the sealing surface and breakage of the spool guide rod will occur due to the influence of liquid corrosion and impurities, which leads to a lot of disassembly and assembly, fast failure, and short service life of the check valve. Change the traditional horizontal lift check valve's structure...

Top Entry Metal Seated Butterfly Valves

Top Entry Metal Seated Butterfly Valves

The internal leakage of the butterfly valve A pneumatic butterfly valve is installed on the discharge pipe where the powder is fed to the reactor by a screw conveyor, and a part of the solvent (acetone) will evaporate and flow back during the reaction. If the butterfly valve leaks internally, it will not only increase the solvent loss, but also easily cause the powder in the powder feed...

The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part Two)

The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part Two)

1.2 Design of the connecting structure of the valve stem and sphere There are various structures for connecting the valve stem and sphere. To adapt to harsh working conditions such as high temperatures and high pressure and multiphase flows in the coal chemical industry, we choose a pin connection concentric structure for the hard-sealed ball valve in the coal chemical industry....

The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part One)

The Improvement in the Hard-seal Trunnion Ball Valve for the Coal Chemical Industry (Part One)

Abstract The optimization and improvement in the design of the partial structure of the hard-seal trunnion ball valve for the coal chemical industry is introduced, involving the static sealing structure of the valve seat and valve body, connection structure of the valve stem and sphere, fixed structure of the sphere pivot and upper and lower bearing structures. The improvement...

Main Factors Affecting the Sealing of the Valve

Main Factors Affecting the Sealing of the Valve

The following are the main factors affecting the sealing of the valve. The sealing pair structure With the change of temperature or sealing force, the structure of the sealing pair will change, which will affect and change the force between the sealing pairs, thus impairing the sealing of the valve. It is necessary to choose seals with elastic deformation. At the same time, pay...

The Selection of Valve Sealing Surface Materials

The Selection of Valve Sealing Surface Materials

The sealing surface is the most critical working surface of the valve; the quality of sealing surfaces directly affects the service life of the valve; the material of the sealing surface is an important factor to ensure the quality of the sealing surface. The following factors should be considered during the selection of valve sealing surface materials. 1. Corrosion resistance The corrosion of...

Measures to Prevent Corrosion of Metal Valves

Measures to Prevent Corrosion of Metal Valves

1. Improve the machining technology and structure of valves. Measures to prevent corrosion should be considered from the beginning of valve design. A valve with reasonable structural design and correct machining technology will undoubtedly have a good effect on reducing the corrosion of valves. Therefore, the related departments should improve the valve parts which are...

Differences between the Three Kinds of PCS Ball Valves?

Differences between the Three Kinds of PCS Ball Valves?

The PCS ball valve comes in single piece, two piece or three piece designs. What are the differences between the three? The structure The one piece ball valve is composed of the ball, PTFE O-ring and lock nut. The diameter of the ball is slightly smaller than that of the pipe, which is similar to the wide ball valve. The two piece ball valve consists of two parts. Its sealing...

Valve Cleaning and Lubrication

Valve Cleaning and Lubrication

The purpose of valve maintenance is to ensure that the valve is clean and well-lubricated all the time. Besides, the purpose is to make sure the valve has complete parts and is in the normal operating state all the year round. Valve cleaning The valve surface, the trapezoidal thread of the valve stem and the stem nut, gears, worm gears, worms and other parts are prone to be stained...

Comparison Between Wafer-style and Flanged Butterfly Valves

Comparison Between Wafer-style and Flanged Butterfly Valves

Butterfly valves are not only widely used in general industry such as petroleum, gas, chemical industry and water treatment, but also used in the cooling water system of a thermal power station. The butterfly valve can be divided into wafer-style one and flanged one. For the flanged butterfly valve, flanges are set at both inlet and outlet ends of the valve body and they are connected...

Causes of Valve Leakage

Causes of Valve Leakage

Causes of internal leakage of valves during construction 1. Improper transportation and hoisting cause the overall damage of the valve, resulting in internal leakage of the valve. 2. Before the valve leaves the factory, drying and preservative treatment are not performed after the water pressure test is finished, leading to corrosion of the sealing surface and internal...

Technical Requirements for Valve Assembly

Technical Requirements for Valve Assembly

Valves are a kind of commonly used hardware products. There are certain technical requirements for valve assembly. Otherwise, the assembled valve cannot reflect its excellent performance. What are the technical requirements of valves before and during assembly? Technical requirements before valve assembly 1. According to processing requirements, some parts need to be polished,...