Analysis of main technical performance of brass valve in valve industry

Today, Xiaobian will analyze the main technical performance of brass valve from seven aspects: light performance, sealing performance, flow medium, opening and closing force and moment, opening and closing speed, action sensitivity and reliability, and service life. I hope it will help you to know the products of brass valve manufacturers.

 

 

 

1. Strength performance

 

 

 

The strength performance of copper valve refers to the ability of copper valve to withstand medium pressure. Copper valve is a mechanical product bearing internal pressure, so it must have enough strength and rigidity to ensure long-term use without fracture or deformation.

 

 

 

2. Sealing performance

 

 

 

The sealing performance of copper valve refers to the ability of sealing parts of copper valve to prevent medium leakage. It is the most important technical performance index of copper valve. There are three sealing parts of the copper valve: the contact between the two sealing surfaces of the opening and closing parts and the valve seat; the fitting between the packing and the valve stem and the packing box; and the connection between the valve body and the valve cover. The former leakage is called internal leakage, that is to say, it will affect the ability of copper valve to cut off medium. For block valves, internal leakage is not allowed. The last two leaks are called leakage, that is, the medium leaks from the inside to the outside of the valve. Leakage will cause material loss, environmental pollution and even accidents. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the copper valve must have reliable sealing performance.

 

 

 

3. Flow medium

 

 

 

When the medium flows through the copper valve, there will be pressure loss (i.e. the pressure difference before and after the copper valve), that is, the copper valve has a certain resistance to the flow of the medium, and the medium will consume a certain amount of energy to overcome the resistance of the copper valve. In terms of energy conservation, the resistance of copper valve to flow medium should be reduced as much as possible when designing and manufacturing copper valve.

 

 

 

Brass valve manufacturer

 

 

 

4. Opening and closing force and moment

 

 

 

The opening and closing force and moment refer to the force or moment that must be applied to open or close the copper valve. When closing the copper valve, it is necessary to form a certain sealing pressure between the opening and closing parts and the two sealing surfaces of the engine seat, and to overcome the friction between the valve stem and the packing, between the thread of the valve stem and the nut, between the end support of the valve stem and other friction parts. Therefore, a certain closing force and moment must be applied. During the opening and closing process of the copper valve, the required opening and closing force and moment are The maximum value is the final instant of closing or the initial instant of opening. The design and manufacture of copper valve should strive to reduce its closing force and moment.

 

 

 

5. Opening and closing speed

 

 

 

The opening and closing speed is indicated by the time required for the copper valve to complete one opening or closing action. Generally, there is no strict requirement for the opening and closing speed of copper valve, but some working conditions have special requirements for the opening and closing speed, such as some requirements for quick opening or closing to prevent accidents, some requirements for slow closing to prevent water hammer, etc., which should be considered when selecting the type of copper valve.

 

 

 

6. Operation sensitivity and reliability

 

 

 

This refers to the sensitivity of copper valve to the change of medium parameters. For the copper valves used to adjust the medium parameters such as throttle valve, pressure reducing valve and regulating valve, as well as the copper valves with special functions such as safety valve and drain valve, the functional sensitivity and reliability are very important technical performance indexes.

 

 

 

7. Service life

 

 

 

It indicates the durability of copper valve, is an important performance index of copper valve, and has great economic significance. It is usually expressed by the opening and closing times that can guarantee the sealing requirements, or by the use time.