The structure and characteristics of a multi-purpose valve combined with a steel gate valve and a check valve are analyzed, and the working principle of its operation without mutual interference is introduced. 1. Overview Both gate valves and check valves are general-purpose valves for cut-off and circulation. The direction of movement of the closing part of the gate valve is perpendicular to that of the fluid, and it is operated by a driving device. It is a forced sealing valve. The disc...
A Combination of Gate Valves and Check Valves Read More »
1. Structural forms An elastic seated eccentric cylindrical plug valve is a new type of plug valve (Figure 5), which adopts an elastic seated eccentric structure. The plug is of crankshaft type, and the surface is completely covered with rubber. The valve seat is surfaced with corrosion-resistant alloy. There is a certain eccentric distance from the center of the plug’s sealing surface. The cross-section of the flow channel is rectangular. Figure 5 Eccentric plug valves 1. Valve bodies...
Elastic Seated Eccentric Cylindrical Plug Valves Read More »
Cylindrical plug valves have an integral plug that rotates within a well-fitting cylindrical valve body. If a direct metal-to-metal seal is used, considerable torque is required to drive the plug valve. It can also be coated on the sealing surface of the valve body or the outer surface of the cock to reduce friction and improve sealing ability. Typical coatings include PTFE, RislanTM and ceramics. Plugs are hard-faced to reduce friction and corrosion. A PTFE sleeve can be installed between the plug...
Types and Structural Characteristics of Plug Valves Read More »
A plug valve is a type of valve that has been in use for over a century. It is a simple and reliable valve that is used to control the flow of fluids in pipelines. The design of the plug valve consists of a cylindrical or conical plug that rotates inside the valve body to open or close the flow passage. A plug valve has several advantages over other types of valves. It has a low-pressure drop, which means that it does not impede the flow of fluids through the pipeline. It also has a tight seal,...
Plug Valves Read More »
Solar valves At present, the utilization of solar energy mainly includes photovoltaic and photothermal power generation. The report released by the China Photovoltaic Industry Association predicts that from 2022 to 2025 showed that the average annual installed capacity of photovoltaics in the country will reach 85 million kilowatts to 101.25 million kilowatts, 10 times that of 2013, equivalent to the installed capacity of four Three Gorges power stations. In the field of photovoltaic power generation,...
Valves Used for Five Major Clean Energy Sources Read More »
Spring check valves are designed to allow fluid to flow in one direction while preventing backflow. They consist of a valve body with an inlet and outlet port, a spring-loaded disc or ball that sits on the seat of the valve body, and a spring that keeps the disc or ball in place. The operation of spring check valves is simple yet effective. When fluid flows through the valve in the correct direction, it pushes the disc or ball away from the seat, allowing it to pass through. However, when there...
What Are the Requirements for Choosing Spring Check Valves? Read More »
Actively and steadily promote carbon peaking and carbon neutrality based on China's energy resources. Plan and implement the carbon peaking step by step. Deeply promote the energy revolution. Strengthen the clean and efficient use of coal, and accelerate the planning and construction of a new energy system; actively participate in the global governance of climate change. To achieve carbon neutrality and carbon peaking, an important part is to transform from fossil energy-based energy...
Five Clean Energy and Opportunities for Valves Read More »
1.1 Factory tests The factory test is carried out on the valve. The valve is installed vertically in the nuclear power plant. When the valve is sealed after the linkage test, the whole valve is lying horizontally. The test conditions are more stringent when the valve is installed horizontally, which can cover the requirements of the original machine running vertically. 1.2 Qualification tests (1) Tests for the cold state Purpose of the test: to verify the functional performance of the valve...
Testing Nuclear-grade Large-diameter Ultra-long Distance Gate Valves Read More »
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 More »
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 More »
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 More »
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 More »
