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

sportdafa,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)

sportdafa,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&n...


Top Entry Metal Seated Butterfly Valves

sportdafa,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)

sportdafa,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)

sportdafa,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 improve...


Main Factors Affecting the Sealing of the Valve

sportdafa,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,...


The Selection of Valve Sealing Surface Materials

sportdafa,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 corr...


Measures to Prevent Corrosion of Metal Valves

sportdafa,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 ...


Differences between the Three Kinds of PCS Ball Valves?

sportdafa,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 s...


Valve Cleaning and Lubrication

sportdafa,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 s...


Comparison Between Wafer-style and Flanged Butterfly Valves

sportdafa,Comparison Between Wafer-style and Flanged Butterfly Valves

1xbet kenya appButterfly 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 co...


Causes of Valve Leakage

sportdafa,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 inter...


Technical Requirements for Valve Assembly

sportdafa,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 pol...


Types and Selection of Electric Valves

sportdafa,Types and Selection of Electric Valves

Types of electric valves The electric valve is a valve driven by electric energy and is mainly composed of the electric actuator and various valves. The electric valve is easy to use, and it can run when the switch is turned on, so it is the most commonly used automatic control valve. There are many types of electric valves, including electric control valves, electric ball val...


The Selection and Application of Butterfly Valves

sportdafa,The Selection and Application of Butterfly Valves

basketball kmart auThe butterfly valve is suitable for flow regulation. Because the pressure loss of butterfly valves in the pipeline is relatively large (it is about three times that of gate valves), the influence of the pressure loss on pipe systems should be fully considered when the butterfly valve is to be selected. Also, take into consideration the firmness of the disc bearing the pres...


Structural Features and Pressure Test Methods of Plug Valves

sportdafa,Structural Features and Pressure Test Methods of Plug Valves

Structural features of plug valves Plug valves are valves with cylindrical or conically tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more passages through the plug, so that fluid can flow through the plug when the valv...


Tips for Pneumatic Butterfly Valves

sportdafa,Tips for Pneumatic Butterfly Valves

Test and adjustment of pneumatic butterfly valves Whether manual, pneumatic, hydraulic or electric butterfly valves, all their parts have been strictly debugged before leaving the factory. When rechecking the sealing performance, users should evenly fix the inlet and outlet sides, close the butterfly valve, pressurize the inlet side, observe whether there is leakage at the outlet s...


What is the Full Bore and the Reduced Bore Ball Valve

sportdafa,What is the Full Bore and the Reduced Bore Ball Valve

The nominal diameter is the general caliber of various pipes and pipe fittings. Pipes and pipe fittings with the same diameter can be connected with each other and have interchangeability. It is not the actual outer diameter or inner diameter of the pipe, though its value is close to or equal to the inner diameter of the pipe. In the process pipeline system, most valves are designed to ...


Advantages of Bellows Seal Globe Valves

sportdafa,Advantages of Bellows Seal Globe Valves

The design of the bellows seal globe valve is better than that of the ordinary globe valve. So, what are the advantages of bellows seal poker casino gratis  compared with ordinary ones? 1. The bellows seal globe valve has no leakage and is applied to high-risk medium. 2. The common globe valve is sealed with packing, and a slide will occur between the valve stem and packing so that the va...


Application Prospect of Stainless Steel Valves

sportdafa,Application Prospect of Stainless Steel Valves

live odds footballStainless steel valves are used for the industrial application because of their outstanding advantages such as long service life, not easy to rust, and environmental protection. They have become the valve products that must be purchased by relative industries. Therefore, customers should ask the merchants to provide the production and factory certificates of the stainless ...


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