The main technical performance of the copper valve
2021/06/24
Strength performance
The strength performance of the copper valve refers to the ability of the copper valve to withstand the pressure of the medium. The copper valve is a mechanical product that bears internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation.
Sealing performance
The sealing performance of the copper valve refers to the ability of each sealing part of the copper valve to prevent the leakage of the medium. It is the most important technical performance index of the copper valve. There are three sealing positions of the copper valve: the contact between the opening and closing parts and the two sealing surfaces of the valve seat; the matching place between the packing and the valve stem and the stuffing box; the connection between the valve body and the bonnet. The first leakage is called internal leakage, which is commonly referred to as lax closure, which will affect the ability of the copper valve to cut off the medium. For shut-off valves, internal leakage is not allowed. The latter two leaks are called external leakage, that is, the medium leaks from the inside of the valve to the outside of the valve. Leakage can cause material loss, pollute the environment, and cause accidents in severe cases. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the copper valve must have reliable sealing performance.
Flow medium
After the medium flows through the copper valve, pressure loss (the pressure difference before and after the copper valve) will occur, that is, the copper valve has a certain resistance to the flow of the medium, and the medium consumes a certain amount of energy to overcome the resistance of the copper valve. From the perspective of energy conservation, when designing and manufacturing copper valves, it is necessary to reduce the resistance of the copper valve to the flowing medium as much as possible.
Hoisting force and hoisting moment
The opening and closing force and opening and closing torque refer to the force or moment that must be applied to the opening or closing of the copper valve. When closing the copper valve, it is necessary to form a certain sealing specific pressure between the opening and closing parts and the two sealing surfaces of the seat, and at the same time, it must overcome the gap between the valve stem and the packing, the thread between the valve stem and the nut, and the support at the end of the valve stem. It is necessary to apply a certain closing force and closing torque due to the frictional force of other friction parts. During the opening and closing process of a copper valve, the required opening and closing force and opening and closing torque are changed, and the maximum value is at the final instant of closing. Or the initial moment of opening. When designing and manufacturing copper valves, efforts should be made to reduce its closing force and closing torque.
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