China Handan Shengnada New Material Technology Co., Ltd. Company Cases

Common valve types and uses   1. Ball valve The opening and closing part is a ball, which is driven by the valve stem and rotates 90° around the axis of the ball valve to open or close. It can also be used for fluid regulation and control. In the pipeline, it is mainly used to cut off, distribute and change the flow direction of the medium. It has good sealing, convenient operation, rapid opening and closing, simple structure, small size, low resistance, and light weight.   2. Gate valve The opening and closing part is the gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. It is mainly used to cut off the medium in the pipeline. It can flow in any direction on both sides. It is easy to install, easy to operate, has a smooth channel, a small flow resistance, and a simple structure. 3. Butterfly valve The opening and closing part is a butterfly plate, which is driven by the valve stem and rotates 90° around its own axis in the valve body to achieve the purpose of opening, closing or regulation. It is mainly used to cut off the medium in the pipeline. It has the characteristics of simple structure, flexible operation, fast opening and closing, small size, short structure, small resistance and light weight.   4. Globe Valve The opening and closing parts of the globe valve are plug-shaped valve discs. The sealing surface is flat or conical. The valve disc moves linearly along the center line of the valve seat to achieve opening and closing. The globe valve can only be fully opened and fully closed, and cannot be adjusted or throttled. It is mainly used to cut off the medium in the pipeline. It has the characteristics of simple structure, easy installation, convenient operation, smooth channel, small flow resistance and simple structure. 5. Check valve refers to a valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the backflow of the medium. It is also called a check valve, a one-way valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve. Its main function is to prevent the backflow of the medium, the reversal of the pump and the drive motor, and the discharge of the container medium. 6. Control valve also known as control valve, is the final control element in the field of industrial automation process control, which changes the process parameters such as medium flow, pressure, temperature, and liquid level by receiving the control signal output by the control control unit and using power operation. It is generally composed of an actuator and a valve, and can be divided into pneumatic control valves, electric control valves, and self-acting control valves. 7. Solenoid valve is a combination of an electromagnetic coil and a straight-through or multi-way valve. It can be divided into two types: normally open and normally closed. It controls the switch or switches the flow direction of the medium through AC220V or DC24 power supply. It is an automation basic element used to control the fluid. The selection of solenoid valves should first follow the four principles of safety, reliability, applicability, and economy. 8. Safety valve The opening and closing parts are in a normally closed state under the action of external force. When the medium pressure in the equipment or pipeline exceeds the specified value, it prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium outside the system. Special valves. Safety valves belong to the automatic valve category, which are mainly used for boilers, pressure vessels and pipelines to play an important protective role. 9. Needle Valve is an important part of the instrument measurement pipeline system. It is a valve that can accurately adjust and cut off the fluid. The valve core is a very sharp cone. It is generally used for smaller flow and higher pressure gas or liquid. The structure is similar to the stop valve. Its function is to open or cut off the pipeline passage. 10. Trap Valve is also called steam trap, also known as drain valve. It is used to discharge condensate, air and carbon dioxide gas in the steam system as soon as possible. It is an energy-saving product. Choosing a suitable steam trap can make the steam heating equipment reach the highest working efficiency. To achieve the most ideal effect, it is necessary to have a comprehensive understanding of the working performance and characteristics of various types of steam traps.

Analysis of the current status and future trends of global sales of manhole covers   1. Introduction As an important part of urban infrastructure, manhole covers are widely used in drainage, electricity, communications and other fields. With the acceleration of global urbanization, the demand for manhole covers continues to grow. This article will analyze the current status and future development trends of global sales of manhole covers. 2. Current status of the global manhole cover market 2.1 Main sales regions - North America: The United States and Canada have stable demand, mainly used in municipal and construction projects. - Europe: Germany, France, the United Kingdom and other countries have a stable demand for high-quality manhole covers. - Asia-Pacific: China, India, Japan and other countries have a rapid growth in demand due to infrastructure construction and urbanization. - Middle East: The United Arab Emirates, Saudi Arabia and other countries have a large import volume due to infrastructure construction and urbanization. - Latin America: Brazil, Mexico and other countries have increased demand due to accelerated urbanization. - Africa: South Africa, Nigeria and other countries have increased imports due to accelerated urbanization. 2.2 Main manufacturers - China: The world's largest producer and exporter of manhole covers, with competitive product quality and prices. - India: Low production cost, and increasing export volume year by year. - The United States: The main producer of high-end manhole cover market, with high product quality. - Europe: Germany, Italy and other countries occupy an important position in the high-precision manhole cover market. 3. Manhole cover market driving factors 3.1 Urbanization process The global urbanization process is accelerating, and the demand for infrastructure construction is increasing, which drives the demand for manhole cover market. 3.2 Infrastructure investment   Governments of various countries have increased infrastructure investment, especially in developing countries, to promote the growth of manhole cover market. 3.3 Technological innovation The application of new materials and new processes has improved the performance and life of manhole covers, driving market demand. 4. Challenges in the manhole cover market 4.1 Fluctuation of raw material prices Fluctuation of raw material prices such as steel affects production costs and market prices. 4.2 Environmental protection requirements Environmental protection laws and regulations in various countries are becoming increasingly stringent, and enterprises need to invest more resources in environmental protection transformation. 4.3 Market competition Market competition is fierce, and enterprises need to continuously improve product quality and service levels. 5. Future trends in the manhole cover market 5.1 Intelligent manhole covers With the development of Internet of Things technology, intelligent manhole covers will become a future trend, capable of real-time monitoring of manhole cover status and environmental data. 5.2 Green and environmental protection The application of environmentally friendly materials and processes will become the mainstream, and companies need to increase R&D investment. 5.3 Customized demand Customers have increased personalized demand for manhole covers, and companies need to provide customized services. 5.4 Emerging markets Emerging markets such as Africa and Latin America will become important growth points for the manhole cover market. 6. Conclusion The manhole cover market has broad development prospects worldwide. Companies need to seize market opportunities, meet challenges, enhance competitiveness through technological innovation and market expansion, and achieve sustainable development.