Showing 121–140 of 177 results

Stellite Alloy Surfacing Repair Processes of 15CrMo Forged Gate Valves (Part Two)

2. Technical difficulties of on-site repair of gate valve seats 2.1 Characteristics of materials of valve seats The surfacing material of the gate valve seat is Stellite6. It belongs to the Co-Cr-W-C series of alloys, which is a classic series of Stellite alloys. It is characterized by small alloying elements and high carbon content. This series of alloys have good hardness, good wear resistance, good temperature resistance and cavitation resistance, and poor toughness. The...

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Stellite Alloy Surfacing Repair Processes of 15CrMo Forged Gate Valves (Part One)

The common damage types of valve seats and mechanisms are introduced based on the structural characteristics of the sealing surface of the gate valve seat. The characteristics of the surfacing material Stellite alloy and the base material 15CrMo and the difficulties in surfacing repair are analyzed. The process of surfacing welding repair is introduced in detail, including preparation before welding, alloy surface surfacing, and surfacing welding surface processing....

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Analysis of Tooling for Guide Grooves of Forged Valve Bodies' Wedges

Abstract: The problems existing in the processing of the traditional guide grooves of wedges are analyzed, and the structure and working principles of the new tooling are introduced in this article.   1. Overview Gate valves are widely used in petrochemical and other pipelines to control the medium in the pipeline. They have the characteristics of small flow resistance, flexible opening and closing, long life, compact structure, safety and reliability. The guide groove on the valve body of...

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The Processing of Guide Grooves of Forged Steel Gate Valves' Wedges

Abstract The production efficiency of the forged steel gate valve's wedge is improved by improving the processing method of guide grooves of the forged steel gate valve's wedges.   A forged steel gate valve is used to connect and stop the flow in the pipeline. A forged steel gate valve is widely used in water, oil, natural gas, food and other industries due to its characteristics of low flow resistance, flexible opening and closing,...

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Matters Related to Forged Steel Flanged Gate Valves

Forged steel flanged gate valves The bonnet of the forged steel flanged gate valve is divided into three types: bolted bonnets, welded bonnets, and pressure self-tightening bonnets. This kind of valve has the main feature of having rising stems with brackets, and the integral valve body is a flange. The flat-bottomed valve seat design reduces the fluid pressure and makes the flow smooth, which makes the valve widely used as a regulating and intercepting device on fluid pipelines...

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Optimization of Surfacing Welding of Forged Steel Valve Bodies (Part Two)

2.2 The results of penetrant inspection A gas hole is found on the surfacing surfaces of samples 1, 2, 3 and 5 of forged steel valves, and there are many slag inclusions for the sample 2. The sample 3 has a small amount of slag inclusions. There are gas holes on the surfacing surface for the sample 4. Samples between 6 and 10 as well as 14 have defects on their surfacing surfaces. Cracks are found on the surfacing surfaces of the samples 11, 12, 13 and 15. A lot of slag inclusions were found...

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Optimization of Surfacing Welding of Forged Steel Valve Bodies (Part One)

Abstract: Given that gas holes, cracks and other defects often appear in the surfacing of the sealing surface of the small-diameter forged steel valve body, we focus on the current, voltage and surfacing surface height to analyze the influences of their changes on the quality of the surfacing surface. Find out the law of defects, hardness and structure composition with parameters by analyzing surface observation, hardness inspection and metallographic tests, and...

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Development of High-pressure Forged Steel Gate Valves for Hydrogenation Equipment (Part Three)

5.3 The sealing packing system In order to ensure the reliability of dynamic sealing of the valve stem packing, the spring-loaded, double packing seal structure shown in the Figure 4 was designed, and a leakage tube was added in the middle of the double packing. The packing consists of two sets of V-shaped graphite plus upper and lower braided graphite to form a double seal. The butterfly spring loading force of the bottom packing is 1.1 times higher than the nominal medium pressure generating...

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Development of High-pressure Forged Steel Gate Valves for Hydrogenation Equipment (Part Two)

Table 1 Selection of main body materials and internal materials Valve bodies ASTM A216 WCB/ ASTM A105   ASTM A217 WC6/ ASTM A182 F11 CL2   ASTM A351 CF8C/ASTM A182 F321, F347 Packing gaskets  ASTM A105   ASTM A182 F11 CL2   ASTM A182 F321, F347 Valve seats ASTM A105 plus S116   ASTM A182 F11 CL2 plus STL6   ASTM A182 F321, F347 plus STL6 Valve discs ASTM A216 WCB plus STL6/ASTM A105+STL6 ASTM A217 WC6 plus STL6/ASTM...

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Development of High-pressure Forged Steel Gate Valves for Hydrogenation Equipment (Part One)

Abstract: The design of key components such as the general structure of the valve body, sealing packing system and sealing packing detection system are carried out in view of working conditions, design and development difficulties of high-pressure forged steel gate valves for hydrogenation equipment; key processes such as receiving inspection of raw materials, welding processing and matching design of sealing test equipment are controlled. The results of the pressure test...

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Knowledge of Forged Steel Cryogenic Globe Valves

Material selection of forged steel cryogenic globe valves Selection of materials for gaskets and packing of forged steel cryogenic globe valves: As the temperature drops, the fluoroplastics shorten greatly, which will result in a decline in the sealing function and cause leakages. Asbestos packing cannot prevent permeability leakages. Rubber has swelling properties to LNG and cannot be used at low temperatures.   Selection of valve bonnets of cryogenic globe valves: long...

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An Introduction to Forged Steel Ball Valves

Applications of forged steel ball valves Forged steel ball valves are widely used valve products in many industries. They are widely used for air, water, steam, various corrosive media, slurry, oils, liquid metal and radioactive media due to their excellent performance.   Advantages of forged steel ball valves The advantages of forged steel ball valves are as follows: 1. Forged steel ball valves have very good resistance to vulcanization and cracking. The...

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Analysis and Research on Processing Technology of Forged Stainless Steel Valve Bodies

Abstract: The processing characteristics of forged stainless steel valve bodies are discussed. Through a comparison of the processing technology schemes, the processing technology of the hydraulic hexagonal turret machine tool is given.   1. Overview Forged steel valves are widely used in petrochemical, chemical, oil extraction, oil refining, steel, thermal power and nuclear power valves due to their high fibrous strength and good material quality. The valve body of forged stainless...

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The New Nested Forged Steel Ball Valve

Research on the new invented nested forged steel ball valve 1. Defects of traditional ball valves First, the biggest drawback of traditional ball valves is that great friction and torque will be generated when the ball rotates. When the valve is opened or closed, the opening and closing torque is too great, which affects the opening speed. If the rotating torque is too great, the connection between the valve stem and ball is easily damaged. There is great friction when...

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Design and Forging Process of Forged Steel High Pressure Ball Valve Bodies

1. Overview In recent years, because of the development of materials and manufacturing technology, ball valves have been used as cutting devices for pipelines in high temperature and pressure conditions. High-performance ball valves with high parameters adopting cast steel valve bodies can no longer meet the requirements, so it is necessary to use forged steel valve bodies with better toughness and reliability.   2. Design of forged steel ball valve bodies The...

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Structural Characteristics of Forged Steel High Pressure Metal Sealed Ball Valves

1. Overviews At present, the traditional ball valves used in China are generally cast steel low temperature and low-pressure soft seal ball valves, which are difficult to adapt to the harsh medium conditions of high temperature and pressure granular sand slurry in special pipelines, valve leakages and jamming due to sealing materials being not resistant to high temperature or sealing surfaces being damaged. The forged steel high-pressure...

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Water-cooled High Temperature Forged Steel Valves

1. Overview A high temperature valve is one of the important and indispensable devices in the petrochemical industry, power station, long distance pipeline, nuclear industry, aerospace and high temperature engineering. With the rapid development of the industry and the development of export markets, the demand for high temperature valves and their requirements are getting higher and higher, and higher requirements are also put forward for the safety of high temperature valves....

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Ultra High Pressure and Small Diameter Forged Steel Globe Valves

The structural characteristics of the new ultra high pressure and small diameter forged steel globe valve are discussed and performance of commonly used forged steel globe valves with small diameters is introduced in this article.   1. Overview In view of the situation that several commonly used ultra high pressure small diameter forged steel globe valves often leak at sealing positions of valve stems during use. The middle cavity...

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Design and Application Prospects of Forged Steel Ammonia Valves

Abstract The safety of the ammonia refrigeration system is the focus of the ammonia refrigeration industry. Safe and energy-saving ammonia valves are the inevitable development of the industry. The innovative design of forged steel ammonia valves and their application prospects are discussed in this article based on safety performance and use requirements for liquid ammonia refrigeration systems.   In recent years, ammonia leakage accidents have occurred frequently...

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Causes for Internal Leakage of the Electric Forged Steel Ball Valve & Its Solutions

Electric forged steel ball valves have been more and more widely used in various industrial control systems due to its advantages of high control accuracy, convenient installation and adjustment. However, there are also some problems that bug the on-site installation and adjustment personnel in the process of use, that is, the problem of internal valve leakage. Causes for the common internal leakage of the electric forged steel ball valves and...

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