valve sealing performance is part of the sealing ability to prevent media leaks, it is the valve of the most important technical performance indicators. Valve sealing parts are three: open and close the two pieces with the valve seat sealing surface contacts between the Office; filler stem and the stuffing of the distribution and the Branch; body junctions with the valve cover. Of which the first one is called the leakage of internal leakage, which is commonly known as Guan lax, it will affect the media's ability to cut off the valve. For the cut valve, the internal leakage is not allowed. Leakage after the two called the leakage, that is, medium leaking into the valve from the valve outside. Leakage would cause material loss, environmental pollution can also cause serious accidents. For flammable and explosive, toxic or radioactive medium, leakage is inadmissible and, therefore, the valve must have a reliable sealing performance.
Mobile Media
Medium flows through the valve would cause pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium to overcome the resistance of the valve is necessary to consume a certain energy. From the conservation of energy considerations, the design and manufacture of valves, it is necessary to minimize the resistance of the valve on the flow medium.
Headstock headstock force and torque
Hoisting force and hoisting moment is to open or close the valve that must be imposed by force or torque. Close the valve, the need to open and close with the Coma Berenices two pieces of the sealing surface of the seal formed between certain specific pressure, while also overcoming the stem and the packing between the stem and the nut thread between the stem end bearing at and other friction parts of the friction, and therefore must apply the closing force and closing a certain moment, the valve in the open and close the process, the required hoisting hoisting force and moment of change, and its maximum is close to the final instant or open the initial transient. The design and manufacture of valves should be sought to reduce the closing force and closing moments.
Hoisting Speed
Hoisting speed is used to open or close the valve to complete a movement to represent the time required. Valves open and close speeds generally no strict requirements, but some conditions the speed of the hoist have special requirements, if any, the prompt to open or closed, to prevent an accident, and some require slow and shut down to prevent the resulting water hammer, etc. , which should be considered in selection of valve type.
Action sensitivity and reliability of
This refers to the valve for the medium parameters change, the sensitivity of the response accordingly. For the throttle valve, reducing valve, regulating valve used to adjust the medium parameters of the valves, as well as safety valves, steam trap with a specific function such as valves, its function is very important to the sensitivity and reliability of the technical performance indicators.
Life
It is said that the durability of the valve is a valve key performance indicators, and has great economic significance. Usually able to ensure that the number of seals required to open and close that can also be used to indicate the use of time. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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