Characteristics, Pros and Cons of Manual Ball Valves
Characteristics of the Manual Ball Valve
1. Wear resistance: The valve core base of the hard sealed ball valve is sprayed and welded by the alloy steel. Even the sealing ring is also made of alloy steel. Therefore, the hard sealed ball valve will not cause too much wear during the opening and closing.
2. The good sealing performance: because the seals are manually ground, they can only be used when the valve core and sealing ring completely match. Therefore, the sealing performance is relatively reliable.
3. Light switch: because the use of springs at the bottom of the sealing ring can tightly hold the sealing ring and valve core, the switch is very light when external forces exceed the pre-tightening force of the spring.
4. The long service life has been widely used in various departments such as petroleum, chemical industry, power generation, paper-making, aviation, rockets, and atomic energy. It is also present in people's daily lives. Pneumatic ball valves have a compact structure, reliable sealing, simple structure, and convenient maintenance. Moreover, the sealing surface and spherical surface are often in a closed state, so they are not easily eroded by media and are also easy to operate and maintain. They are more suitable for general working media such as water, acid, solvents, and natural gas.
Pros and Cons of the Manual Ball Valve
Advantages of the manual ball valve
1. The fluid resistance is small, and its drag coefficient is equal to that of pipe sections with the same length.
2. Simple structure, small size, and light weight
3. Tight and reliable. The sealing surface material of the ball valve is widely used in plastic, with good sealing performance. It has also been widely used in vacuum systems.
4. Convenient operation. The opening and closing are quick with only 90 degrees rotation from full opening to full closing, which can facilitate the remote control.
5. Convenient maintenance, and simple structure. The sealing rings are generally movable, which can make the disassembly and replacement more convenient.
6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface.
7. It has a wide range of applications, with diameters length ranging from a few millimeters to several meters. It can be applied from high vacuum to high pressure. When the ball rotates 90 degrees, it should all appear spherical at the inlet and outlet, thereby cutting off the flow.
Disadvantages of the manual ball valve
1. Because the main sealing ring material of the valve seat of the ball valve is polytetrafluoroethylene, which is inert to almost all chemical substances. Almost all. It has the comprehensive characteristics of small friction coefficient, stable performance, aging resistance, wide temperature application range and excellent sealing performance. However, the physical properties of polytetrafluoroethylene, including its high expansion coefficient, sensitivity to cold flow and poor thermal conductivity, require that the design of valve seat seals must revolve around these characteristics. Therefore, when the sealing material becomes hard, the reliability of the seal is compromised. Moreover, the temperature resistance level of polytetrafluoroethylene is relatively low and can only be used at temperatures below 180 ℃. Beyond this temperature, the sealing material will age. When considering long-term use, it is generally only not used at 120 ℃.
2. Its regulating performance is relatively poor compared to globe valves, especially pneumatic valves (or electric valves).
1. Wear resistance: The valve core base of the hard sealed ball valve is sprayed and welded by the alloy steel. Even the sealing ring is also made of alloy steel. Therefore, the hard sealed ball valve will not cause too much wear during the opening and closing.
2. The good sealing performance: because the seals are manually ground, they can only be used when the valve core and sealing ring completely match. Therefore, the sealing performance is relatively reliable.
3. Light switch: because the use of springs at the bottom of the sealing ring can tightly hold the sealing ring and valve core, the switch is very light when external forces exceed the pre-tightening force of the spring.
4. The long service life has been widely used in various departments such as petroleum, chemical industry, power generation, paper-making, aviation, rockets, and atomic energy. It is also present in people's daily lives. Pneumatic ball valves have a compact structure, reliable sealing, simple structure, and convenient maintenance. Moreover, the sealing surface and spherical surface are often in a closed state, so they are not easily eroded by media and are also easy to operate and maintain. They are more suitable for general working media such as water, acid, solvents, and natural gas.
Pros and Cons of the Manual Ball Valve
Advantages of the manual ball valve
1. The fluid resistance is small, and its drag coefficient is equal to that of pipe sections with the same length.
2. Simple structure, small size, and light weight
3. Tight and reliable. The sealing surface material of the ball valve is widely used in plastic, with good sealing performance. It has also been widely used in vacuum systems.
4. Convenient operation. The opening and closing are quick with only 90 degrees rotation from full opening to full closing, which can facilitate the remote control.
5. Convenient maintenance, and simple structure. The sealing rings are generally movable, which can make the disassembly and replacement more convenient.
6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface.
7. It has a wide range of applications, with diameters length ranging from a few millimeters to several meters. It can be applied from high vacuum to high pressure. When the ball rotates 90 degrees, it should all appear spherical at the inlet and outlet, thereby cutting off the flow.
Disadvantages of the manual ball valve
1. Because the main sealing ring material of the valve seat of the ball valve is polytetrafluoroethylene, which is inert to almost all chemical substances. Almost all. It has the comprehensive characteristics of small friction coefficient, stable performance, aging resistance, wide temperature application range and excellent sealing performance. However, the physical properties of polytetrafluoroethylene, including its high expansion coefficient, sensitivity to cold flow and poor thermal conductivity, require that the design of valve seat seals must revolve around these characteristics. Therefore, when the sealing material becomes hard, the reliability of the seal is compromised. Moreover, the temperature resistance level of polytetrafluoroethylene is relatively low and can only be used at temperatures below 180 ℃. Beyond this temperature, the sealing material will age. When considering long-term use, it is generally only not used at 120 ℃.
2. Its regulating performance is relatively poor compared to globe valves, especially pneumatic valves (or electric valves).
