Water supply network from pipes and valves and other plumbing fixtures, consisting of parts. According to various needs (networks of water pressure of scheduling, allocation, and maintenance repair and water needs, old and new pipeline connections, pipe flushing, etc), daily opening and closing of the valve. Valve service life and quality of the normal operation of the network, played a pivotal role in the network, must be given high priority.

1, water supply security

Does not affect the water quality is an important indicator in valve selection. Valve direct part, the inside of the valve body in contact with water, sealing parts, valve plate, many manufacturers of the sealing parts made of rubber material. Common rubber material is nitrile rubber (NBR), Chloroprene rubber (CR) or ethylene-propylene rubber (EPDM). These rubber is a synthetic rubber. In the process of synthesis, to join in the natural rubber more than 10 kinds of raw materials and additives such as anti aging agent. Final synthetic rubber can be used for water supply valve seal, need to see if the rubber is nontoxic, compliance with drinking water standards. As for the inside of the valve and the valve plate and other parts, manufacturers using the method of painting in the past, only consider rust problem, without considering whether it is toxic. In practice, we found that in water supply networks, lined with corrosion protection of pipeline problem has been solved, and pipeline valves without lining, due to deposition of iron bacteria in water and water in the valve Chamber and valve plate of erosion and deposition, resulting in some walled Hill of accumulation in the body of the valve. Affects not only water quality, but also some valve doesn't stay closed one of the main reasons. Therefore, we demand that these parts of the direct contact with the water, should be spraying toxic paint, preferably by spraying toxic epoxy powder electrostatic spraying method. When we select valve, first check whether a nontoxic rubber and paint certificate and certificate of inspection, only valves with the above conditions, to ensure water quality from pollution, guarantee the security of supply.

2, the advancement of technology

Valve production technology development, from the old gate valve soft seal gate valve, from the butterfly's valve to the inserting type butterfly's valve, single-eccentric double flange butterfly valve, hard seal eccentric butterfly valve, from traditional single exhaust valve, such as exhaust valve to high speed two holes.

3, water seal

Whether the valve seal for valve's basic requirements. In practical applications, sealed a variety of types, such as soft seal, seal, valve plate seal, valve seals, seal, Ray seals, and so on. No matter what kind of sealing will not affect the sealing effect. 

4, testing the authenticity of

The valve manufacturer must provide true and accurate inspection reports. These reports include:

① materials testing--in the original iron C,Si,Mn,P,S, such as the composition and quality of coke;

② testing – metallurgical testing of the casting elongation test, strength test;

③ sealing test--duplex pump pressure test and multiple switch test;

Health of black rubber and paint the quarantine report aspects of health and quarantine reports. Providing untrue reports enterprises produced products cannot be used.

5 quality reliability

Good ring to valve quality, reflected in valve manufacturing process.

① raw iron matching second sand mold manufacturing c cast iron casting about Machining accuracy.

To have a complete quality assurance system. Valve number indicator is not very helpful, it does not have to meet the test of switching more than 5,000 times. Because valve does not always switch in the network. Sometimes, some ten years before switching the valve again. We found in practical work on the butterfly valve set screw is loose when it is installed, there is no bolt thread.

6, operating flexibility

Flexible valve operation is very important. Operational flexibility, not only in the driving mode selected, is also reflected in the transmission-related on the machining accuracy of the parts. For example, in the butterfly valve on the mode of transmission. There are two types of transmission--screw the nuts-and-worm. 

7, price reasonable

Valve should have a reasonable price, reasonable price is not necessarily the lowest price. If you focus only on the lowest price, it is easy to mislead the manufacturers to sell their products and compete to lower prices, even lower than the cost price of the product, manufacturer in order not to lose money is bound to cut corners on the processes, materials, produced by valve there are quality problems, used in water supply network, it will hurt the users themselves. So make sure to pay attention to when choosing a valve, and encourage manufacturers to make the application of value engineering principle, strengthening the function of main, removed redundant function, optimizing system functionality. In the management efforts, in the cost accounting efforts. It should be noted that reasonable price is the lowest price, but the lowest price is not necessarily a reasonable price.

8, after-sales service guarantee

Valves used in the water supply network, there will be problems of one kind or another, some are of the valve itself, some interference from external factors damage, construction of savage, illegal operation, poor management, and so on. But whatever the reason, valve problems, will affect the network's run, need to meet a manufacturer, so valve selection requires manufacturers to have a good after-sales service guarantee. Once the valve problems, rushed to the scene in the shortest possible time, resolve the problem as soon as possible.

9, consistency between ordering and delivery

Here are the consistency of valve is the valve manufacturer produces products with all aspects of water supply enterprises need the product requirements are consistent. This will require orders and supplier (water supply and valve manufacturer) working together, rather than just one effort. First, as set goods party of water enterprise, in to valve production enterprise set goods Shi, must to to written form to valve production enterprise proposed clear of technology requirements, content should including valve of type

10, establish and improve the system of inspection and review

When a water supply enterprises, through a series of study and research through a range of tests, and finally chose one or more valve manufacturer, product allows access to it after the local water supply the market permits, means that the water supply valve manufacturer established between supply and demand. Meanwhile, valve manufacturer for the water supply companies to ensure safe, reliable water supply also assume joint and several liability.