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Sanfitec Brass Industry Co.,Ltd.
Sanfitec Brass Industry Co.,Ltd.

Main Technical Performance of Brass Valve

Sanfitec Brass Industry will analyze the main technical performance of brass valves from seven aspects: light 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. We hope it can help you understand the products of brass valve manufacturers.


1. Strength performance of brass valves


The strength performance of brass valve refers to the ability of copper valve to bear medium pressure. Copper valve is a mechanical product bearing internal pressure, so it must have sufficient strength and stiffness to ensure long-term use without rupture or deformation.


2. Sealing performance of brass valves


The sealing performance of brass valve refers to the ability of each sealing part 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 opening and closing parts and the two sealing surfaces of the valve seat; Fit between packing and valve stem and stuffing box; Connection between valve body and bonnet. The first leakage is called internal leakage, which is commonly referred to as lax closing, which will affect the ability of the copper valve to cut off the medium. For block valves, internal leakage is not allowed. The leakage at the latter two places is called external leakage, that is, the medium leaks from inside the valve to outside the valve. External leakage will cause material loss, pollute the environment, and even cause accidents in serious cases. For flammable, explosive, toxic or radioactive media, external leakage is not allowed, so the brass valve must have reliable sealing performance.


3. Flow medium of brass valve


After the medium flows through the copper valve, there will be pressure loss, that is, the copper valve has a certain resistance to the flow of the medium. In order to overcome the resistance of the copper valve, the medium must consume a certain amount of energy. In terms of energy conservation, when designing and manufacturing copper valves, brass fitting factory should reduce the resistance of copper valves to flowing media as much as possible.


4. Opening and closing force and torque of brass valve


Opening and closing force and opening and closing torque refer to the force or torque that must be applied to open or close 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 hair seat, and overcome the friction between the valve stem and the packing, between the threads of the valve stem and the nut, at the end support of the valve stem and other friction parts. Therefore, a certain closing force and closing torque must be applied. During the opening and closing of the brass valve, The required opening and closing force and opening and closing torque are variable, and their maximum value is at the final instant of closing or the initial instant of opening. When designing and manufacturing copper valves, brass valve manufacturer shall strive to reduce their closing force and closing torque.


5. Opening and closing speed of brass valve


The opening and closing speed is expressed by the time required for the copper valve to complete an opening or closing action. Generally, there are no strict requirements for the opening and closing speed of brass valves, but some working conditions have special requirements for the opening and closing speed. For example, some require rapid opening or closing to prevent accidents, and some require slow closing to prevent water hammer, which should be considered when selecting the type of copper valve.


6. Action sensitivity and reliability


This refers to the sensitivity of brass valves to changes in medium parameters. For copper valves used to adjust medium parameters such as throttle valve, pressure reducing valve and regulating valve, as well as copper valves with specific functions such as safety valve and steam trap, its sensitivity and reliability are very important technical performance indicators.


7. Service life


It indicates the durability of copper valves, which is an important performance index of brass valves, and has great economic significance. It is usually expressed by the opening and closing times that can ensure the sealing requirements, and it can also be expressed by service time.