Abstract: The valve is an important part of the vessel's pipeline responsible for communicating and blocking the flow of the medium. It can not only grasp the direction of the medium flow, but also control the flow and pressure. This article analyzes the selection and development of valve technology in marine pipelines, mainly several common valves, such as safety valves, booster valves, pressure reducing valves, globe valves, etc. These valves have their own usefulness and value. Should pay attention to its development trend.
Key words: ship pipelines; valve technology; modeling development In recent years, China's overall national strength has been continuously improving, and the marine industry has also achieved great development. Therefore, the shipbuilding industry has also received a lot of attention. Valve technology is only a small part of the ship's pipeline and is often forgotten, but it has a very important role. Not only play a role in the connection and truncation, but also can control the flow rate, flow direction, pressure, etc., are all very important details.
1 Selection of ship pipeline valve technology In the process of selecting the ship pipeline valve, first, it is necessary to understand the basic characteristics of the valve, the place of use, the situation of the medium circulation, etc. Secondly, the actual working environment and conditions should be combined. , Choose the valve with high cost performance and safe and reliable performance. Ship pipeline valve selection should follow some basic principles, that is, quality and safety performance is more reliable, more applicable principle.
1.1 Non-return valve Normally, the non-return valve we call is a one-way valve. Its main function is to allow the media inside the pipe to flow in one direction, making it impossible to reverse flow. For example, lift-type check valves are generally installed on horizontal pipes, that is, horizontal pipes. Normally, they will not be installed on vertical pipes. At the same time, when connecting lift type check valves, gaskets and connection methods should be properly selected, and the appropriate type should be selected in conjunction with the effects of work pressure and temperature. In addition, in the installation process must fully understand the direction of the flow of the media, to ensure that the direction of the arrow above the check valve and the direction of the media flow is consistent, if there is a problem with the mark is not clear, we must use the low into the high Principles of installation.
1.2 Cut-off valve The cut-off valve is a common valve that we often see in our lives. Its main function is to connect the medium in the pipeline or cut off the medium in the pipeline. Cut-off valves can usually be divided into two types, one is a right angle cut-off valve and the other is a cut-through cut-off valve. Although the cut-off valve is a very common valve, there are still many problems to be noted when using it. For example, in use, we still need to consider the working pressure of the valve, working temperature and other conditions, and then choose the appropriate connection method. Also, the arrow direction of the stop valve and the flow of the medium should be the same. In addition, in the cut-off valve, its handwheel is turned off clockwise and counterclockwise, suitable for any position.
1.3 Gate valve According to the position of the valve stem during operation, the gate valve can be divided into a stem rising type and a stem fixed type. It is also a widely used shut-off valve. The gate valve is also called a gate valve. Although it may be called a stop valve, the advantage of the gate valve over the globe valve is that the flow area is relatively large and the flow resistance is relatively small. And the gate valve does not distinguish between inlet and outlet, and its medium can pass from either side. In addition, because the structural length of the gate valve is relatively short, it is relatively labor-saving to perform switching. However, the valve also has many shortcomings, such as relatively easy to friction between the valve core and the valve seat, the sealing ability is relatively easy to be destroyed, and can not withstand excessive pressure.
1.4 The valve box combines two or more valve parts together to form an integral header. This header is also called valve box. The valve box can not only control valves in a centralized manner, but also facilitates management. And it also saves valve parts. The valve box can be divided into single row and double row, and then can be made into double or multi-type according to actual needs. Valve boxes are usually made entirely of cast iron or they can be connected using a combination valve. According to the actual use, it can be divided into suction valve box, discharge valve box and transfer valve box three. The first is to inhale the valve box. This is a single-row valve box with the lower part open and the upper part connected, and then the number can be set according to actual needs. The suction valve box sucks liquid from the lower part of the valve into the valve box and discharges it from the upper common discharge chamber. In combination with this feature, the suction valve box can be widely used in multiple suction lines such as fuel, lubricating oil, and water supply. Second, discharge the valve box. This type of valve box is a single-row valve box with the upper part separated and the lower part connected, and the number of joints needs to be set according to actual needs. The liquid is usually sucked into the valve box from the lower common suction chamber and then discharged from the upper part.
1.5 Butterfly Valves The valve discs of disc valves are constantly rotating around the valve stem, and are usually controlled by disc-shaped valve discs and vertical stems. The butterfly valve has the advantage that it is very easy to carry out automatic control, because the butterfly valve is controlled by turning the valve stem. The automatic control butterfly valve can be divided into two types, electric and pneumatic. At the upper end of the butterfly valve, an angle indicator is usually installed to better understand the switching state of the valve.
2 Development and exploration of ship pipeline valve technology 2.1 Status of ship pipeline valve development With the development of society and economy, China's shipbuilding industry has made a great leap, but the relatively important supporting technology is relatively backward, such as valves. There is a great deal of lag in the development of technology. Because there are many types of valves used in the pipelines of ships, this will affect the establishment of the valves and bring about great difficulties in revising relevant standards. In addition, there are still the valves used in China's ship pipelines, or manual valves such as globe valves and gate valves. The traditional old-fashioned valves still have many deficiencies in terms of weight, volume, and sealability. Therefore, China's ship pipeline valve technology has much room for development.
2.2 Ship pipeline valve development measures Now, China's ship pipelines are still using more traditional valves, and this part still occupies a very large proportion, so we must not only develop more new products, but also should Actively renovating and renovating the old standard valves cannot ignore those traditional valves, nor can we only seek innovation at a glance. In the process of innovating the product, it can be considered from many aspects, such as the weight, size, and airtightness of the valve, which can also more easily and fundamentally solve the problem. At the same time, it can also promote the use of some new types of valves, such as ball valves, butterfly valves, etc., as well as some remote-controlled valves, which can also increase the intensity of promotion and be actively applied to the use of ship pipelines. In the actual development process, for the existing problems in valve technology, it can be solved by changing the structure of the valve. It is also possible to develop more new types of ship pipeline valves to meet actual needs. In addition, in order to better meet the development needs of modern ships, we should actively carry out innovative research and development in response to the vacancies existing in the valves of ships' pipelines or valves whose performance cannot meet the requirements. Such as the development of high temperature and pressure valves, low temperature valves, valves that can adjust the pressure.
3 Summary Nowadays, the production and development of China's ship pipeline valves have already reached a certain scale. Not only for some relatively common and common valves, but also some relatively new types of valves have certain design capabilities and manufacturing capabilities. As long as we actively explore the development of ship pipeline valves, we will certainly be able to improve the valve technology and promote the development of the shipbuilding industry.
references:
[1] Li Xiaozhan, Lu Haijin. Selection and development of marine pipeline valve technology, exploration and construction [J]. New technologies and products in China, 2017, (9): 116-117.
[2] Li Qingsong, Ma Bingjie, Yao Hui et al. Evaluation of Impact Resistance of Ship Casing Road and Auxiliary Equipment[J]. Diesel Engine, 2016, 38(5):39-43.
[3] Yu Lin. Failure Analysis and Maintenance Suggestions for Marine Valves [J]. Science and Technology Innovation Guide, 2014, (29): 81-82.
Key words: ship pipelines; valve technology; modeling development In recent years, China's overall national strength has been continuously improving, and the marine industry has also achieved great development. Therefore, the shipbuilding industry has also received a lot of attention. Valve technology is only a small part of the ship's pipeline and is often forgotten, but it has a very important role. Not only play a role in the connection and truncation, but also can control the flow rate, flow direction, pressure, etc., are all very important details.
1 Selection of ship pipeline valve technology In the process of selecting the ship pipeline valve, first, it is necessary to understand the basic characteristics of the valve, the place of use, the situation of the medium circulation, etc. Secondly, the actual working environment and conditions should be combined. , Choose the valve with high cost performance and safe and reliable performance. Ship pipeline valve selection should follow some basic principles, that is, quality and safety performance is more reliable, more applicable principle.
1.1 Non-return valve Normally, the non-return valve we call is a one-way valve. Its main function is to allow the media inside the pipe to flow in one direction, making it impossible to reverse flow. For example, lift-type check valves are generally installed on horizontal pipes, that is, horizontal pipes. Normally, they will not be installed on vertical pipes. At the same time, when connecting lift type check valves, gaskets and connection methods should be properly selected, and the appropriate type should be selected in conjunction with the effects of work pressure and temperature. In addition, in the installation process must fully understand the direction of the flow of the media, to ensure that the direction of the arrow above the check valve and the direction of the media flow is consistent, if there is a problem with the mark is not clear, we must use the low into the high Principles of installation.
1.2 Cut-off valve The cut-off valve is a common valve that we often see in our lives. Its main function is to connect the medium in the pipeline or cut off the medium in the pipeline. Cut-off valves can usually be divided into two types, one is a right angle cut-off valve and the other is a cut-through cut-off valve. Although the cut-off valve is a very common valve, there are still many problems to be noted when using it. For example, in use, we still need to consider the working pressure of the valve, working temperature and other conditions, and then choose the appropriate connection method. Also, the arrow direction of the stop valve and the flow of the medium should be the same. In addition, in the cut-off valve, its handwheel is turned off clockwise and counterclockwise, suitable for any position.
1.3 Gate valve According to the position of the valve stem during operation, the gate valve can be divided into a stem rising type and a stem fixed type. It is also a widely used shut-off valve. The gate valve is also called a gate valve. Although it may be called a stop valve, the advantage of the gate valve over the globe valve is that the flow area is relatively large and the flow resistance is relatively small. And the gate valve does not distinguish between inlet and outlet, and its medium can pass from either side. In addition, because the structural length of the gate valve is relatively short, it is relatively labor-saving to perform switching. However, the valve also has many shortcomings, such as relatively easy to friction between the valve core and the valve seat, the sealing ability is relatively easy to be destroyed, and can not withstand excessive pressure.
1.4 The valve box combines two or more valve parts together to form an integral header. This header is also called valve box. The valve box can not only control valves in a centralized manner, but also facilitates management. And it also saves valve parts. The valve box can be divided into single row and double row, and then can be made into double or multi-type according to actual needs. Valve boxes are usually made entirely of cast iron or they can be connected using a combination valve. According to the actual use, it can be divided into suction valve box, discharge valve box and transfer valve box three. The first is to inhale the valve box. This is a single-row valve box with the lower part open and the upper part connected, and then the number can be set according to actual needs. The suction valve box sucks liquid from the lower part of the valve into the valve box and discharges it from the upper common discharge chamber. In combination with this feature, the suction valve box can be widely used in multiple suction lines such as fuel, lubricating oil, and water supply. Second, discharge the valve box. This type of valve box is a single-row valve box with the upper part separated and the lower part connected, and the number of joints needs to be set according to actual needs. The liquid is usually sucked into the valve box from the lower common suction chamber and then discharged from the upper part.
1.5 Butterfly Valves The valve discs of disc valves are constantly rotating around the valve stem, and are usually controlled by disc-shaped valve discs and vertical stems. The butterfly valve has the advantage that it is very easy to carry out automatic control, because the butterfly valve is controlled by turning the valve stem. The automatic control butterfly valve can be divided into two types, electric and pneumatic. At the upper end of the butterfly valve, an angle indicator is usually installed to better understand the switching state of the valve.
2 Development and exploration of ship pipeline valve technology 2.1 Status of ship pipeline valve development With the development of society and economy, China's shipbuilding industry has made a great leap, but the relatively important supporting technology is relatively backward, such as valves. There is a great deal of lag in the development of technology. Because there are many types of valves used in the pipelines of ships, this will affect the establishment of the valves and bring about great difficulties in revising relevant standards. In addition, there are still the valves used in China's ship pipelines, or manual valves such as globe valves and gate valves. The traditional old-fashioned valves still have many deficiencies in terms of weight, volume, and sealability. Therefore, China's ship pipeline valve technology has much room for development.
2.2 Ship pipeline valve development measures Now, China's ship pipelines are still using more traditional valves, and this part still occupies a very large proportion, so we must not only develop more new products, but also should Actively renovating and renovating the old standard valves cannot ignore those traditional valves, nor can we only seek innovation at a glance. In the process of innovating the product, it can be considered from many aspects, such as the weight, size, and airtightness of the valve, which can also more easily and fundamentally solve the problem. At the same time, it can also promote the use of some new types of valves, such as ball valves, butterfly valves, etc., as well as some remote-controlled valves, which can also increase the intensity of promotion and be actively applied to the use of ship pipelines. In the actual development process, for the existing problems in valve technology, it can be solved by changing the structure of the valve. It is also possible to develop more new types of ship pipeline valves to meet actual needs. In addition, in order to better meet the development needs of modern ships, we should actively carry out innovative research and development in response to the vacancies existing in the valves of ships' pipelines or valves whose performance cannot meet the requirements. Such as the development of high temperature and pressure valves, low temperature valves, valves that can adjust the pressure.
3 Summary Nowadays, the production and development of China's ship pipeline valves have already reached a certain scale. Not only for some relatively common and common valves, but also some relatively new types of valves have certain design capabilities and manufacturing capabilities. As long as we actively explore the development of ship pipeline valves, we will certainly be able to improve the valve technology and promote the development of the shipbuilding industry.
references:
[1] Li Xiaozhan, Lu Haijin. Selection and development of marine pipeline valve technology, exploration and construction [J]. New technologies and products in China, 2017, (9): 116-117.
[2] Li Qingsong, Ma Bingjie, Yao Hui et al. Evaluation of Impact Resistance of Ship Casing Road and Auxiliary Equipment[J]. Diesel Engine, 2016, 38(5):39-43.
[3] Yu Lin. Failure Analysis and Maintenance Suggestions for Marine Valves [J]. Science and Technology Innovation Guide, 2014, (29): 81-82.
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