If the domestic level control valve design, production and the level of advanced countries have a certain gap between the reality is, but if there is a very big gap, not necessarily in line with the reality. Why, then, the domestic effects of the use of the valve and far less time and the introduction of this product?
As long as you compare our calculation of valve selection table with the calculation of foreign selection table, it is not difficult to find, we too simple. Instrument Society of the United States in a standard format set out in the contents of the 49 serial numbers, my form less than 20 serial numbers, many are not included in the content, selection is bound properly, incomplete, resulting in "inherently"; Then domestic valve standardization Too high to Allergen-changing, and not "right" to be treated different. The only valve leakage, for example, reflect the strong user. It is not only related to the structure of the selection. It also involves an imbalance force. Who careful consideration? No. Since there is no will certainly create a customs die, not open, leakage, sealing the reliability of the poor (can be started, how long can not do so on), such as the use of. To resolve it, it is necessary to consider the detailed
It includes:
1, according to the pressure to close the valve, the power imbalance in the calculation to determine the structure and implementation of the valve body size, the first death related to ensure that the needs of sufficient power output.
2, to determine the optimum in order to facilitate the flow of sealing.
3, the structure of the valves, pressure on the large, large diameter valves (DN100, such as valves, △ P = 20MPa, the unbalanced thrust of up to Ft = 0.25π × 102 × 20 = 15.7t), the structure of very careful consideration Important, including the balance of power and resistance to cavitation, erosion into account.
4, unclean medium, medium scale and stammer a little bit of the performance of the block, blocked, stuck, how can seal?
5, strong corrosion on the media, cut pieces of corrosion resistance, and the inevitable reliable, a lot of valve leakage in the near future to run on standard, the reasons for the cut in corrosion items.
6, sealed on the types of considerations:
a. hard or soft seal seal;
b. the need for wear-resisting alloy Surfacing and improve reliability;
c. soft seal and soft sealing material type.
As long as you compare our calculation of valve selection table with the calculation of foreign selection table, it is not difficult to find, we too simple. Instrument Society of the United States in a standard format set out in the contents of the 49 serial numbers, my form less than 20 serial numbers, many are not included in the content, selection is bound properly, incomplete, resulting in "inherently"; Then domestic valve standardization Too high to Allergen-changing, and not "right" to be treated different. The only valve leakage, for example, reflect the strong user. It is not only related to the structure of the selection. It also involves an imbalance force. Who careful consideration? No. Since there is no will certainly create a customs die, not open, leakage, sealing the reliability of the poor (can be started, how long can not do so on), such as the use of. To resolve it, it is necessary to consider the detailed
It includes:
1, according to the pressure to close the valve, the power imbalance in the calculation to determine the structure and implementation of the valve body size, the first death related to ensure that the needs of sufficient power output.
2, to determine the optimum in order to facilitate the flow of sealing.
3, the structure of the valves, pressure on the large, large diameter valves (DN100, such as valves, △ P = 20MPa, the unbalanced thrust of up to Ft = 0.25π × 102 × 20 = 15.7t), the structure of very careful consideration Important, including the balance of power and resistance to cavitation, erosion into account.
4, unclean medium, medium scale and stammer a little bit of the performance of the block, blocked, stuck, how can seal?
5, strong corrosion on the media, cut pieces of corrosion resistance, and the inevitable reliable, a lot of valve leakage in the near future to run on standard, the reasons for the cut in corrosion items.
6, sealed on the types of considerations:
a. hard or soft seal seal;
b. the need for wear-resisting alloy Surfacing and improve reliability;
c. soft seal and soft sealing material type.
floating ball valve top entry ball valve 3pc forged ball valve forged steel ball valve trunnion mounted ball valve
7, the level of leakage, testing methods, pressure test, inspection methods, and so on.
This shows that the rough, rough will certainly have the effect of the use of: the majority of products in general, so, when some ill-considered and special occasions, the valve will certainly not good to use.
To sum up, the domestic application of the control valve of the main issues are: the calculation, not a comprehensive selection, resulting in "inherently"; manufacturer of the product of a single too, can not meet the needs. The solution is: first of all grasp the quality of the first clearance (also of great importance to the production plant is not shut) signed a contract related to review the selected valve can be really effective to meet the requirements of working conditions and use, to overcome "inherent"; followed by the production plant The production of various products, particularly special products, product variants to suit special occasions. To achieve these two points, both selection and manufacturers must be proficient in the application of the valve.
7, the level of leakage, testing methods, pressure test, inspection methods, and so on.
This shows that the rough, rough will certainly have the effect of the use of: the majority of products in general, so, when some ill-considered and special occasions, the valve will certainly not good to use.
To sum up, the domestic application of the control valve of the main issues are: the calculation, not a comprehensive selection, resulting in "inherently"; manufacturer of the product of a single too, can not meet the needs. The solution is: first of all grasp the quality of the first clearance (also of great importance to the production plant is not shut) signed a contract related to review the selected valve can be really effective to meet the requirements of working conditions and use, to overcome "inherent"; followed by the production plant The production of various products, particularly special products, product variants to suit special occasions. To achieve these two points, both selection and manufacturers must be proficient in the application of the valve.
