5 the quality of the reliability of
A good quality ring valve, the valve manufacturer in the entire process. ① matching the original iron; ② sand mold manufacturing; ③ casting molten iron castings; ④ precision machining. To have a more complete quality guarantee system. Valve of the indicators of the number of little importance, does not have to switch to meet more than 5000 tests. Because the valves in the pipe network is not a regular switch. In some cases, some eight or ten years before switching valve first. In practical work, we discovered that the positioning of the butterfly valve screw is loosened during installation, and some simply do not have丝扣bolts.
6, the flexibility of operation
Whether the flexible valve operation is very important. Operation of flexible, not only in the choice of what kind of drive is also reflected in the transmission mechanism and the components related to the machining accuracy. For example, in the butterfly valve on the drive. There are two transmission methods - lead screw and nut type worm. The general characteristics of screw-type nut switch 2 in the slow middle fast, relatively good, but screw driving force due to the smaller moment, the operator is not easy to master the operation of hoist the extent of the valve, the valve has been prone to shut down operation so that the screw is still distorted, and fracture. And generally easy to worm-based closed-off spaces. At the same time, valve stem seal problems, parts of butterfly valve speed transmission torque and rotation are the matching problem in the valve operation. Therefore, the choice of what kind of drive should be based on the situation of water supply enterprises, and after listening to the views of operators, in close coordination with the manufacturers so that the valve can choose to operate a flexible, can meet the needs of the use and work.
7, the reasonableness of the price
Valve should have a reasonable price, reasonable price is not necessarily the lowest price. If we only focus on the lowest price, it is easy to mislead the manufacturers to sell their products, competing for low prices, even lower than the cost of product sales, the manufacturers in order not to lose money they are bound to be in the process, the jerry-building materials, produced by the valve on the There are quality problems, water pipes used in the Internet, the ultimate loser is the user's own. Therefore, we must pay attention to when in the selection of valves, encourage manufacturers to use value engineering principles, and strengthen the main function to remove redundant features, and optimize the system. Management efforts, efforts in cost accounting. It should be noted that a reasonable price can be the lowest price, but price is not necessarily the lowest reasonable price.
8 guarantee of after-sales service
Valves in the use of the water supply network, there will be all kinds of problems, some are of the valve itself, while others come from external factors destruction, brutal construction, illegal operation, management and use of poor. But for whatever reason, valve problems, will affect the operation of networks, will require manufacturers to accommodate the need for choice in the valve valve manufacturer to have a good after-sales service guarantee. Once the valve problem in the shortest possible time to the scene to solve the problem as soon as possible.
9 order and consistency of supply
Here talked about consistency, refers to the production of valve manufacturers valve products and the need for water supply enterprises in all aspects of the product requirements are the same. This requires that the order side and the supply side (the water supply valve production enterprises and enterprises) joint efforts, not just the efforts of one of the parties. First of all, as a side order of the water supply enterprises, production enterprises in order to when the valve must be in writing, to the valve manufacturer specific technical requirements, which should include the type of valve, the valve should be implemented in different parts of the technical standards and quality standards, the main technical parameters, the various parts of the material, valve type, sealing the form of the requirements of sealing materials, structural forms, connected with the drive and try to pressure and intensity of the technical standards for testing, anti-corrosion and lining the requirements of maximum torque and rotation, assembly and appearance requirements, as well as delivery time, location, number and so on. Valve manufacturers based on orders and technical conditions of the contract, reasonable organization of production, and to ensure that the products produced to meet the order unit (water supply enterprise) the use of the requirements of orders with suppliers to ensure consistency between the two sides.
10 to establish a sound system of inspection and review
When a water supply enterprise, through a series of study, research, and through a range of tests, the final choice of one or several valve manufacturers, its product release to allow water to enter the local market after the permits, it means that for water valves business and manufacturing enterprises has been established between the supply and demand. At the same time, business-to-water supply valve production enterprise to ensure safe, reliable water supply is also the corresponding jointly and severally to assume responsibility. On the one hand, the requirements can be consistently valve manufacturers in accordance with the requirements of water supply companies to provide high-quality products. On the other hand, in order to ensure the quality of water supply enterprises also requires manufacturers to establish the necessary fixed-point, periodic inspection of a better inspection system and rehabilitation, generally 2 to 5 years is appropriate. Manufacturers of fixed-point of the people, machines, materials, law, ring, etc. to give the five elements of regular inspection and evaluation. Water supply enterprises in the inspection of the factory should be in accordance with the present use of the valve units of the original technical conditions necessary amendments and additions.
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