For water supply enterprises on the use of water supply pipe network valve requirements, from the water supply safety, advanced technology, water tightness, the authenticity of the test, the reliability of quality, operational flexibility, the price of reasonableness, after-sales service The guarantee, the consistency of the delivery and the establishment of a more complete inspection, reinspection system, put forward the choice of views on the supply pipe network valve. At the same time, the main problems of water supply are also analyzed and discussed with the actual production and the need of using. Water supply pipe network is composed of pipes and other pipe accessories, accessories. According to a variety of needs (water pipe network, water pressure scheduling and deployment, maintenance and repair of water needs, the old and new pipeline connections, pipeline washing, etc.), the valve must be opened and closed every day. The service life and quality of the pipe network determine the normal operation of the pipe network plays an important role, we must attach great importance. As the pipe network is a bridge between the water supply enterprises and the majority of users, it can be said: a water supply enterprise management is reflected in the normal operation of the pipe network; and the normal operation of the water supply network, but also with the life And quality is closely related. The following valve on the water supply network, make a few comments. 1, the safety of water supply does not affect the water quality is an important indicator of the valve selection. The part that the valve contacts with water mainly is the inner side of the valve body, the seal part, the valve plate, etc. At present, the sealing part produced by many manufacturers uses the rubber material. Commonly used rubber materials are NBR, CR or EPDM. These rubbers are synthetic rubbers. In the synthesis process, to add more than 10 kinds of natural rubber additives and anti-aging additives. The final synthesis of rubber can be used for sealing water supply valves, we must look at whether this rubber is non-toxic, is in line with drinking water hygiene standards. As for the valve inside and valve plate and other parts, many manufacturers used the past paint method, only consider the rust problem, without regard to whether toxic. In practice, we found that: the water supply pipe network, the pipe lining corrosion problem is solved, and the pipe network is not lining, due to water precipitation and iron bacteria in the water valve cavity and valve plate erosion and deposition, resulting Some body walls appear hill-like accumulation phenomenon. Not only affects the quality of water supply, but also some of the main reasons for the lax valve. Therefore, we require that all parts that are in direct contact with water should be sprayed with non-toxic paint, it is best to spray non-toxic epoxy powder by electrostatic spraying. When we choose, we should first check whether there is a non-toxic rubber and paint certificates and inspection certificate, only with the above conditions, in order to ensure water quality without pollution, to ensure the safety of water supply. 2, advanced technology The continuous development of valve production technology, from the old gate valve to the soft seal, from the initial to the folder, single eccentric, double eccentric flange, hard seal, from the traditional single-head exhaust valve To high-speed dual port exhaust valve. So choose the valve should also take into account the selected advanced. However, in the application of new technologies, we oppose the indiscriminate distinction and do not understand the users' actual and collective actions. Instead, we should combine new technologies and new technologies with the needs of users. The good thing is in the production of practical applications, from the direct needs of users come. For example: Resin extrusion sealing method, although from the design ideas and factory tests to prove that it does have advantages. However, in actual use, due to the resin material, extrusion resin tools, there is no solution to the user how to use the problem. Users in the use of this valve, you will not appreciate this advanced nature, features and advantages, and as a general use. Therefore, production should not only pay attention to its advanced nature, but also pay attention to its practicality. And pay attention to solve practical problems, such as: exhaust valve float material, float shape (spherical or cylindrical) of the exhaust effect and how the life of research. How to prevent the operation of the worm control (off position) problem, the gearbox box top broken problem, switch the indication of the problem and so on. Therefore, the choice of valve must pay attention to its advanced technology and practicality. 3, the flow of the sealing valve is to play a sealing role is the basic requirements of the valve. In practice, there are many types of seals, such as soft seals, hard seals, valve plate seals, valve seals, face seals, wire seals and more. No matter what kind of seal form, can not affect the sealing effect. In the past, we used to use a part of the valve plate seal, in theory, this biggest advantage is that once the sealant failure, do not have to disassemble the valve can be replaced online. However, in the actual application of water supply enterprises, this advantage is difficult to show. Therefore, if not only need to replace the rubber ring online also at both ends of the pipe apart, the water pipe emptying. At the same time, the replacement of the rubber ring can not be sealed test, can not determine the replacement effect. Therefore, when choosing the valve, we must pay attention to the valve seal, and combined with their actual application, check the valve sealing effect. 4, the authenticity of the test must require the valve manufacturer to provide a true and accurate inspection report. These inspection reports include: â 'raw material inspection - the original iron in the C, Si, Mn, P, S, such as the composition of the ingredients and the quality of coke; â' ¡castings - metallographic test, elongation test, strength test ; ③ seal test - double-sided pump test and multiple switch test; ④ rubber health quarantine report and the coating of health and quarantine reports and so on. Products produced by companies that provide untruthworthy reports can not be used. 5, the reliability of the quality Good quality valve ring, reflected in the whole process of manufacturing. ①original iron matching; ② sand mold manufacturing; ③ cast iron casting; ④ machining accuracy. Have a more complete set of quality assurance system. How many indicators of the switch is of little significance, not necessarily to meet the switch more than five thousand tests. Because the pipe network is not always switch. Sometimes, some valves only switch in ten years. We found in the actual work on the installation of the screws are loose, and some simply do not bolt threaded. 6, the flexibility of operation is flexible operation is very important. Flexible operation, not only reflected in the choice of which drive mode, but also reflected in the transmission mechanism-related components of the processing accuracy. For example, in the transmission mode. There are two general transmission - screw nut type and worm type. General screw nut type is characterized by two slow switch, fast in the middle, better operation, but due to the smaller screw moment, the operator is not easy to grasp the operation of the valve opening and closing level, prone to the valve has been closed Still operating screw twist, fracture. The worm-type is generally easy to turn off. At the same time, the sealing of the valve stem, transmission parts of the speed and torque matching are the problems of the operation of the crux of the problem. Therefore, the choice of transmission mode should be based on the situation of the water supply enterprises, after listening to the views of the operator, and manufacturers work closely with the choice of both flexible operation, but also to meet the needs of use and work. 7, the reasonable price should have a reasonable price, a reasonable price is not necessarily the lowest price. If only pay attention to the lowest price, it is easy to mislead the manufacturers in order to sell their products, competing to lower the price, or even lower than the cost of the product sales, manufacturers in order not to lose money on the inevitable process, materials, jerry-built, there are Quality problems, used in water supply network, the ultimate victims or the user himself. Therefore, we must pay attention to the choice, to encourage manufacturers to use value engineering principles, strengthen the main functions, remove redundant functions, optimize system functions. Work hard in management, work hard on cost accounting. It should be noted that a reasonable price can be the lowest price, but the lowest price is not necessarily a reasonable price. 8, the after-sales service guarantee In the water supply network, there will be such a problem, some are their own, while others are from the external factors of disruption, brutal construction, illegal operations, poor management and so on. However, no matter what the reasons for problems, will affect the operation of the pipe network, require the cooperation of manufacturers, so the choice of the valve manufacturers need to have a good after-sales service guarantee. Once the valve problems, can be rushed to the scene in the shortest possible time, solve the problem as soon as possible. 9, Consistency of Ordering and Delivery The consistency mentioned here means that the products produced by the valve manufacturer are consistent with the requirements of all the products required by the water supply enterprise. This requires the cooperation of the ordering party and the supplier (the water supply company and the manufacturing enterprise), not just the efforts of one of them. First of all, as the ordering party's water supply enterprise, when ordering the manufacturer, it must be in writing to the manufacturer to make clear technical requirements, including the type of valve, valve parts should be implemented in technical standards and quality standards, the main The technical parameters of the various parts, the model, the sealing form, the requirements of the sealing material, the form of the structure, the connection mode and transmission mode, the technical standard of pressure test and strength test, the requirements of anti-corrosion and lining, the maximum torque and turn Number, assembly and appearance requirements as well as delivery time, location, quantity and more. Production enterprises according to the ordering contract and technical conditions, reasonable production, and ensure that the products produced to meet the ordering units (water supply enterprises) the use of requirements, to ensure the consistency of both ordering and delivery. 10, the establishment of a sound inspection and re-inspection system When a water supply enterprises, after many visits, surveys and after a certain range of tests, the final choice of one or several valve manufacturers, to their products allowed to enter the local water supply market Pass, it means that between the water supply enterprises and valve manufacturers indeed
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