The pipeline will supply water plant out of water transmission and distribution to millions of households, the distribution of water supply networks in every corner of the city, water supply networks less to the length of the pipeline hundreds of kilometres, up to thousands of kilometres .
Water is not irreplaceable and necessary for the survival of people, determines the water supply networks of the importance of safe operation. However, due to various objective and subjective reasons, often have to channel some failures, the network will have to keep upgrading, water users often have a partial result of changes in the water of the phenomenon is difficult to avoid. In order to narrow the scope of suspension, the network within the brass ball valve proper installation of control valves is very necessary. Therefore, in a city's water supply networks, the number of tens of thousands of valves, and no rules distributed in the city streets below.
Valve is a kind of "A Thousand Days Yang Bing, for the moment" control equipment, usually asked to open the valve should be in place to reduce the loss of water. If necessary, the valve should be closed quickly, cutting flow reliable.
Valve intact rate, related to the selection valves, valve manufacturing, the design of piping, valves of the assembly, valves and valve hoist operations management, of course, the main reason brass ball valve for the valve or Quality.
2, discuss issues
20 water company through the use of the net valve research, through the 10 valve factory inspection, realize the valve in the water pipe network in the role of big and number, widely distributed, many problems. Water supply networks in the valve operation is not frequent, long-term standby, once the call to be ineffective. Therefore, the selection valves, valve manufacturing, testing valves, valve assembly, the valve management are worthy of much discussion.
Selection of 2.1 valves
(1) valve and the Butterfly
In the water pipe network in order to reduce pipeline soil depth, brass ball valve the general calibre larger pipeline matching butterfly valve, to little effect on the soil depth, to matching valve, to be in diameter around the line-by-case consideration. From the use of the past 10 years, the butterfly valve failure than the high-valve, in conditions permit, to expand the use of the valve is cause for concern. (2) valve
In recent years, many domestic valve manufacturer, development, imitation soft sealing valve, this valve than the traditional wedge or parallel Shuangzha plate valve has the following characteristics:
a. soft valve sealing the valve, valve cover using precision casting foundry, a shape, not the basic machining, non-use of sealed Tonghuan, saving non-ferrous metals.
b. soft sealing valve at the bottom of a pit, not accumulated residue of that valve hoist the low failure rate. c. soft seal Chenjiao disc size of unity, strong interchangeability.
So soft sealing valve will be happy to use the water supply industry as a form. At present the domestic manufacture of soft sealing valve diameter of 1500 mm, but most manufacturers in the manufacture of 80-300 mm calibre, the domestic manufacturing process, there are still many problems, from the inspection of the case, a valve manufacturing company in Shanghai's Body Is entrusted with the domestic foundry casting resin sand over the shape, soft seal disc is a company from foreign imports. The company that soft key components of the valve seal is Chenjiao disc and disc Chenjiao the technical requirements higher, not all foreign manufacturers to achieve, often from the purchase of reliable quality of the factory assembly.