Products knowledge
To improve the service life of valve---2009-10-21
Unlike the manual valve control valve, as installed After the little effort to manage, maintain, and it must spare no maintenance in order to ensure normal operation and longer life. Here we propose to extend valve service life of eight kinds of methods.
1) Grand Opening of work
regulating valve so that a start as far as possible to work at maximum opening, such as 80%. In this way, cavitation, erosion and other damage was done in the head on the spool. With the valve core damage, traffic increased, the corresponding valve and then a little off, so that constantly undermined and gradually shut down, so that the whole spool fully used until the spool and the sealing surface of the root damage, can not be used up. At the same time, large savings gap opening work of big, erosion weakened the outset than valve opening in the middle, and the small opening to work on to improve life of 1 to 5 times. If a chemical plant using this method, the service life of valve 2-fold increase.
2) reduce the increase in job openings S
reduced S, which increases the system In addition to the loss of control valve outside, so that assigned to the valve on the pressure drop reduction, in order to ensure flow through the valve is bound to increase the control valve opening, while the valve on the pressure drop reduction , so that cavitation, erosion is also reduced. The specific measures include: meta-orifice throttle valve, consumption pressure drop; off the road series of the manual control valve to control valve to obtain a more ideal job opening up. The beginning of a major election in a small valve opening work, the use of this method is very simple, convenient and effective.
3) narrowing the diameter increased job openings
By reducing the valve to increase the caliber of the work of opening the specific measures are: ¢Ù replace it a file of small-caliber valve, such as the DN32 replaced by DN25; ¢Ú body does not change, the replacement of small diameter of the valve seat core valve seat. If a chemical plant overhaul will be cutting pieces of dgl0 replacement dg8, increasing life expectancy by one-fold.
4) location of the transfer of damage
severely damaged areas to move to a secondary position, to protect the spool valve seat sealing surface and cutting surface.
5) increased throttle channel
Growth is the most simple throttling channel thicker seat, so that valve seat hole growth, the formation of a longer throttle channel. On the one hand enable the flow of closed-type throttle after the sudden expansion delayed the transfer of damage from location, away from the sealing surface of the role; the other hand, an increase of throttle resistance, reducing the extent of pressure recovery, so that cavitation weakened. Some of the valve seat hole is designed to step-type, wave type, that is, in order to increase resistance, reduce cavitation. This approach in the introduction of high-pressure valve on the device and will be improved the old valve often used, but also very effective.
6) to change the flow of
flow toward the opening direction of open-type flow, cavitation, erosion a major role in the sealing surface, so that spool and the spool valve seat sealing surface of the roots will soon be destroyed; flow towards the closed orientation of a closed-type flow, cavitation, Erosion effect of reducing costs, the valve seat sealing surface below the sealing surface and the valve core to protect the roots, the prolongation of life. Deliberately trying to stream the use of open-type valve, when the more prominent problems in extending life when you can simply change the flow of life-prolonging an ~ 2-fold.
7) The use of special materials
For anti-cavitation (such as the destruction of shape, honeycomb-like dots) and washed (streamlined minor groove), can switch to cavitation and erosion-resistant special materials to create cutting pieces. This particular material has 6YC-1, A4 steel, Secretary Chatterley, carbide and so on. For anti-corrosion, can switch to a more corrosion-resistant, and have a certain mechanical properties, physical properties of materials. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) categories.
8) to change the valve structure
taken to change the valve structure or use a longer valve life means to achieve the purpose of improving life expectancy, such as the choice of multi-level buck-type valve, anti-cavitation valve, corrosion-resistant valve.
1) Grand Opening of work
regulating valve so that a start as far as possible to work at maximum opening, such as 80%. In this way, cavitation, erosion and other damage was done in the head on the spool. With the valve core damage, traffic increased, the corresponding valve and then a little off, so that constantly undermined and gradually shut down, so that the whole spool fully used until the spool and the sealing surface of the root damage, can not be used up. At the same time, large savings gap opening work of big, erosion weakened the outset than valve opening in the middle, and the small opening to work on to improve life of 1 to 5 times. If a chemical plant using this method, the service life of valve 2-fold increase.
2) reduce the increase in job openings S
reduced S, which increases the system In addition to the loss of control valve outside, so that assigned to the valve on the pressure drop reduction, in order to ensure flow through the valve is bound to increase the control valve opening, while the valve on the pressure drop reduction , so that cavitation, erosion is also reduced. The specific measures include: meta-orifice throttle valve, consumption pressure drop; off the road series of the manual control valve to control valve to obtain a more ideal job opening up. The beginning of a major election in a small valve opening work, the use of this method is very simple, convenient and effective.
3) narrowing the diameter increased job openings
By reducing the valve to increase the caliber of the work of opening the specific measures are: ¢Ù replace it a file of small-caliber valve, such as the DN32 replaced by DN25; ¢Ú body does not change, the replacement of small diameter of the valve seat core valve seat. If a chemical plant overhaul will be cutting pieces of dgl0 replacement dg8, increasing life expectancy by one-fold.
4) location of the transfer of damage
severely damaged areas to move to a secondary position, to protect the spool valve seat sealing surface and cutting surface.
5) increased throttle channel
Growth is the most simple throttling channel thicker seat, so that valve seat hole growth, the formation of a longer throttle channel. On the one hand enable the flow of closed-type throttle after the sudden expansion delayed the transfer of damage from location, away from the sealing surface of the role; the other hand, an increase of throttle resistance, reducing the extent of pressure recovery, so that cavitation weakened. Some of the valve seat hole is designed to step-type, wave type, that is, in order to increase resistance, reduce cavitation. This approach in the introduction of high-pressure valve on the device and will be improved the old valve often used, but also very effective.
6) to change the flow of
flow toward the opening direction of open-type flow, cavitation, erosion a major role in the sealing surface, so that spool and the spool valve seat sealing surface of the roots will soon be destroyed; flow towards the closed orientation of a closed-type flow, cavitation, Erosion effect of reducing costs, the valve seat sealing surface below the sealing surface and the valve core to protect the roots, the prolongation of life. Deliberately trying to stream the use of open-type valve, when the more prominent problems in extending life when you can simply change the flow of life-prolonging an ~ 2-fold.
7) The use of special materials
For anti-cavitation (such as the destruction of shape, honeycomb-like dots) and washed (streamlined minor groove), can switch to cavitation and erosion-resistant special materials to create cutting pieces. This particular material has 6YC-1, A4 steel, Secretary Chatterley, carbide and so on. For anti-corrosion, can switch to a more corrosion-resistant, and have a certain mechanical properties, physical properties of materials. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) categories.
8) to change the valve structure
taken to change the valve structure or use a longer valve life means to achieve the purpose of improving life expectancy, such as the choice of multi-level buck-type valve, anti-cavitation valve, corrosion-resistant valve.
