The main technical performance of brass valves will be analyzed from the seven aspects: pressure resistance performance, sealing performance, flow medium, opening and closing force and opening and closing torque, opening and closing speed, action sensitivity and reliability, and service life. Hope it will be helpful for everyone to understand the products of brass valves China.
1. Pressure resistance performance of brass valves
Pressure resistance performance of the brass valve refers to the ability of the brass valve to withstand the pressure of the medium. Brass 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.
2. Sealing performance of brass valves
The sealing performance of a brass valve refers to the ability of each sealing part of the brass valve to prevent the leakage of the medium. It is an important technical performance index of the brass valve. There are three sealing positions for brass valves: 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 former leakage is called internal leakage, which is commonly referred to as lax closure, which will affect the ability of the brass 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 brass valve must have reliable sealing performance.
3. Flow performance of brass valves
After the medium flows through the brass valve, there will be pressure loss (that is, the pressure difference before and after the brass valve), that is, the brass 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 brass valve . From the perspective of energy conservation, when designing and manufacturing brass valves, it is necessary to reduce the resistance of the brass valve to the flowing medium as much as possible.
4. Operating torque performance of brass valves
Opening and closing force and opening and closing torque refer to the force or moment that must be applied to open or close the brass valve. When closing the brass valve, it is necessary to form a certain specific sealing pressure between the opening and closing parts and the two sealing surfaces of the seat. 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 at the place and other friction parts. During the opening and closing process of the brass valve, the required opening and closing force and opening and closing torque are changed, and the maximum value is closing The final moment or the initial moment of opening. When designing and manufacturing brass valves, efforts should be made to reduce their closing force and closing torque.
5. Operating speed performance of brass valves
The opening and closing speed is expressed by the time required for the brass valve to complete an opening or closing action. Generally, there are no strict requirements on the opening and closing speed of brass valves, but some working conditions have special requirements for the opening and closing speed. If some require rapid opening or closing to prevent accidents, some require slow closing to prevent water hammer. And so on, this should be considered when selecting the brass valve type.
6. Action sensitivity and reliability of brass valves
This refers to the sensitivity of the brass valve in response to changes in media parameters. For brass valves used to adjust media parameters such as throttle valves, pressure reducing valves, and regulating valves, and brass valves with specific functions such as safety valves and traps, functional sensitivity and reliability are important technical performance indicators.
7. Life durability of brass valves
It represents the durability of brass valves, is an important performance index of brass valves, and has great economic significance. It is usually expressed in terms of the number of openings and closings that can guarantee the sealing requirements, and it can also be expressed in terms of use time.
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