The following for mobile media, the headstock and headstock moment, hoist speed, sensitivity and reliability of the action, set for life
The valve seal is the performance of the valve closed position to prevent leakage of medium capacity, it is the valve of the most important technical performance indicators. The valve seal has three parts: the gate valve seats and the two pieces of seal face contact between the Department; fill with the letter of the stem and packing and distribution Department; with the body of the valve cover junction. The first is called a leak in the leak, which is known as the poor clearance, it will affect the media's ability to cut off valve. The cut-off valve category, with leakage is not allowed. After the two called the leak of the leak, that is, the medium inside the valve from leaking valve to the outside. Leakage can cause material damage, pollute the environment, but also cause serious accidents. The inflammable, explosive, toxic or radioactive media, is allowed to leak, valve and thus must have a reliable seal performance.
First, mobile media
Medium flowing through the valve will have a pressure loss (both before and after the valve of the pressure difference), which is the valve on the flow of media there is a certain degree of resistance for the medium to overcome the resistance of the valve is necessary to a certain degree of energy consumption. From the energy, the design and manufacture of valves, valve to minimize resistance to the flow of media.
Second, the headstock and headstock moment
Headstock and headstock is the moment to open or close the valve must be imposed by force or torque. Close the valve, the need to hoist pieces made with the sealing surface between the two blocks to form a certain degree of pressure sealing, but also to overcome between the stem and packing, and the stem of the nut thread between the stem end of the Service Support And other parts of the friction force, which must be imposed on certain closed and the closure of torque, the gate valve in the process, the need headstock and headstock is a moment of change, and its maximum in the final closure of the transient Or to open the first instant. The design and manufacture of valve should be closed to reduce the power and torque to close.
Third, the speed hoist
Speed gate valve is open or closed to complete a move to the time required for that. General valve on the headstock speed without strict requirements, but some conditions on the headstock speed with special requirements, if the request be turned on or off quickly to prevent an accident, and some require slow to close to prevent water hammer, and so on have This choice in the type of valve should be taken into account.
Fourth, the sensitivity and reliability of the action
This refers to the valve for media changes in the parameters and make the appropriate response to the degree of sensitivity. The throttle valve, relief valve, the valve used to regulate media, and other parameters as well as the safety valve of the valve, trap with a specific function, such as valves, the sensitivity and reliability of its function is very important to the technical performance indicators.
Five life
It said that the durability of the valve, the valve is an important indicator of performance, and has great economic significance. Usually can be sealed to ensure that the requirements of the headstock to the number that can also use that time.
The valve seal is the performance of the valve closed position to prevent leakage of medium capacity, it is the valve of the most important technical performance indicators. The valve seal has three parts: the gate valve seats and the two pieces of seal face contact between the Department; fill with the letter of the stem and packing and distribution Department; with the body of the valve cover junction. The first is called a leak in the leak, which is known as the poor clearance, it will affect the media's ability to cut off valve. The cut-off valve category, with leakage is not allowed. After the two called the leak of the leak, that is, the medium inside the valve from leaking valve to the outside. Leakage can cause material damage, pollute the environment, but also cause serious accidents. The inflammable, explosive, toxic or radioactive media, is allowed to leak, valve and thus must have a reliable seal performance.
First, mobile media
Medium flowing through the valve will have a pressure loss (both before and after the valve of the pressure difference), which is the valve on the flow of media there is a certain degree of resistance for the medium to overcome the resistance of the valve is necessary to a certain degree of energy consumption. From the energy, the design and manufacture of valves, valve to minimize resistance to the flow of media.
Second, the headstock and headstock moment
Headstock and headstock is the moment to open or close the valve must be imposed by force or torque. Close the valve, the need to hoist pieces made with the sealing surface between the two blocks to form a certain degree of pressure sealing, but also to overcome between the stem and packing, and the stem of the nut thread between the stem end of the Service Support And other parts of the friction force, which must be imposed on certain closed and the closure of torque, the gate valve in the process, the need headstock and headstock is a moment of change, and its maximum in the final closure of the transient Or to open the first instant. The design and manufacture of valve should be closed to reduce the power and torque to close.
Third, the speed hoist
Speed gate valve is open or closed to complete a move to the time required for that. General valve on the headstock speed without strict requirements, but some conditions on the headstock speed with special requirements, if the request be turned on or off quickly to prevent an accident, and some require slow to close to prevent water hammer, and so on have This choice in the type of valve should be taken into account.
Fourth, the sensitivity and reliability of the action
This refers to the valve for media changes in the parameters and make the appropriate response to the degree of sensitivity. The throttle valve, relief valve, the valve used to regulate media, and other parameters as well as the safety valve of the valve, trap with a specific function, such as valves, the sensitivity and reliability of its function is very important to the technical performance indicators.
Five life
It said that the durability of the valve, the valve is an important indicator of performance, and has great economic significance. Usually can be sealed to ensure that the requirements of the headstock to the number that can also use that time.
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