The test pressure of the valve Before leaving the factory, the valve will be pressure tested in accordance with relevant standards in the factory, including shell tests and sealing tests. The shell test is a pressure test of the entire valve shell formed by the connection of the valve body and the bonnet to test the sealing of the valve body and the bonnet and the pressure resistance of the entire shell including the connection between the valve body and the bonnet. The sealing test is used to check...
The Pressure of Water & Gas Discharge Valves in Thermal Power Plants Read
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A spring check valve refers to a valve whose opening and closing part is a circular valve disc and acts by its weight and medium pressure to block the backflow of the medium. It is an automatic valve and is also known as a one-way valve or isolation valve. The disc movement of a spring check valve is divided into lift types and swing types. The lift check valve has a similar structure to the globe valve, except that it lacks the valve stem to drive the disc. The medium flows from the inlet port...
Spring Check Valves Read
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1. The structure design of the valve The valve is a non-rising stem elastic wedge gate valve. The valve body and bonnet adopt integral casting. The body cover is connected by a middle flange and a bolt, which is sealed with 304L flexible graphite plates. The middle cavity of the body cover is an elliptical structure. A reinforcing rib is provided to make the valve bonnet’s external part have enough strength and rigidity (analyzed with ANSYS). The connection between the bonnet and the...
The Structure of Nuclear-grade Large-diameter Ultra-long Distance Gate Valves Read
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1. Overview With the continuous growth of China's energy demand, nuclear power has entered a new stage of both batch development and technological upgrading. However, facing great nuclear power market demand, there is a big difference in the technical level of nuclear-grade large-caliber ultra-long-distance gate valves for nuclear power plants in China compared with foreign countries, especially in the valve design, manufacturing, and test verification technology. Take the fuel transportation...
Designing Nuclear-grade Large-diameter Ultra-long Distance Gate Valves Read
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The painting process of the valve Pretreatment before painting, mixing the paint, applying the primer, applying the finish paint and inspection 2.1 Pretreatment before painting 1) The surface of the valve body should be treated in strict accordance with the surface of the substrate required by the paint manufacturer or the customer. 2) Before surface treatment, oil, welding slag and rust on the surface of the valve body should be removed. 3) Surface treatment must be carried out at...
Painting of the Valve Read
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4. The analysis of finite element of sealing The actual force of the workpiece can be simulated by computer, and its displacement, stress and strain can be analyzed. The commonly used analysis methods include computer finite element simulation analysis and fluid simulation analysis. The elastic deformation of the sphere and valve seat of metal seated ball valves was studied by using the two analysis methods. 4.1 The analysis of finite element simulation 4.1.1 Simplified models Before...
Analysis of Sealing Performance of Metal Seated Ball Valves Read
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1. Overview The ball valve realizes the opening and closing of the valve when the sphere rotates around the axis of the valve stem at an angle of 90. It is mainly used for cutting, distributing and changing the flow direction of the medium on the pipeline. The ball valve has simple structure, good sealing performance, small sizes, light weights, low material consumption, and small installation size within a certain nominal size range. The ball valve has small driving torque, simple operation, rapid...
Sealing Principles and Leakages of Metal Sealed Ball Valves Read
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Stainless steel valves Stainless steel valves are used in more and more fields. Among them, the demand for stainless steel ball valves and stainless steel gate valves in industrial sewage, building structure industries, and environmental protection industrial facilities will also increase year by year. In the water industry, people are paying more and more attention to the problem of water pollution during storage and transportation. A large number of practices have proved that stainless steel valves...
Different Kinds of Stainless Steel Valves Read
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A marine stainless steel valve is a device used to control the pressure, flow and flow direction of the fluid in the ship's pipeline to meet the environmental conditions of the ship. A valve is the control device of the fluid pipeline. Its basic function is to connect or cut off the flow of the medium in the pipeline, change the flow of the medium and the flow direction of the medium, adjust the pressure and flow of the medium, and protect the normal operation of the equipment...
Marine Stainless Steel Valves Read
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Overview The thermal adhesion of the gate valve refers to the phenomenon that the valve is closed in a hot state, and cannot be opened after cooling. Two main reasons When the valve is closed, the valve stem extends from the external low-temperature area to the high-temperature area inside the valve body. With the gradual heating of the valve stem, a small amount of deformation will occur in both the axial and radial directions, and the axial deformation will generate a force F1, which further...
What Is the Thermal Adhesion of Gate Valves? Read
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In order to ensure the normal and effective operation of the power station valve, relevant staff are required to study and analyze its possible problems, and find corresponding maintenance countermeasures to ensure the reliability of the power station valve. The specific maintenance strategy is as follows： Regular maintenance and inspection Regular inspection and maintenance of power station valves is an important means to ensure the reliable and safe operation of power station valves. Therefore,...
Maintenance of Power Station Valves Read
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1. Introduction As we all know, valves play an important role in various systems and are of great significance in the operation and production of the system. If there is a problem in the performance or quality of valves, it will bring a lot of economic losses to the enterprise. Therefore, it is necessary to strengthen the maintenance of the valve. In the operation of the power system, the importance of the valve is self-evident. Once a problem occurs, it will bring losses to the power industry....
Problems Existing in Power Station Valves Read
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