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(1) Urban water supply pipe network system is an important part of the urban system, through the construction of the pipe network system, to achieve water works in tap water The transmission and distribution, and therefore the urban water supply network extending in all directions. Water is the key to people's daily life and social and economic development, which determines the necessity of safe water supply network. Affected by the objective environment and work factors, water transport often shows problems of failure. In order to meet the requirements of practical work, it is necessary to carry out the renovation and transformation of the pipe network system. The valve intactness is affected by the type of valve, the manufacturing module, the pipeline design, the valve Organization, opening and closing operations and other aspects of the impact, in order to optimize the urban water supply network system, the valve must be achieved to improve the overall quality of use.
(2) In the actual working module, the failure rate of the butterfly valve is generally higher than the failure rate of the valve gate. In order to meet the work requirement of the water supply network, the expansion of the gate valve range must be carried out. Soft seal valve gate is a common water supply system mode of operation. For now, China's soft seal gate valve manufacturing system is not perfect.
In China's soft seal gate valve module, copper nut block embedded in rubber lined valve plate, similar to the structure of the gate valve, due to the activity of the nut block, easily lead to the rubber lining plate from the situation. In foreign soft rice seal gate valve work module, copper nut block embedded in lining rubber gate, forming a unified overall, to avoid the valve lining rubber stripping conditions, this method for the valve body and bonnet combination of concentric The degree of request is relatively high. In the soft-seal gate valve opening and closing module, can not be closed too dead, need to meet the requirements of sealing work, to avoid the rubber lining stripping conditions. In the valve pressure test module, through the use of torque wrenches, you can close the degree of control, which is an important part of the water company's valve operation.
(3) In the work of our country's water supply network, the overall use of the middle-line butterfly valve is relatively large, the effect is better. In the manufacturing method, there are many modes of the midline butterfly valve. For example, there is a kind of valve lining layer after stent, a body lining rubber layer without support frame. The first type of rubber lined beam is relatively small, the second type of flow area is relatively large.
(4) The use of butterfly valve has some disadvantages, the butterfly plate occupy a certain cross section, which to some extent increased the head loss rate, the gate valve does not have this problem. Large diameter vertical gate valve height is not conducive to the depth of pipe covering soil depth control, this model will increase the horizontal line occupy the area, which is not conducive to the normal arrangement of other pipelines, ball valves and plug valves to achieve cross-sectional area of ​​the valve to maintain. In the practice of the module, the overall structure of the ball valve is relatively simple, the flow resistance is relatively small, with good sealing, the construction process more flexible, with good maintenance and operation a bit, plug valve also has this kind of a bit, but it's too Water area is not a positive park.
In the quality method, the weight of the ball valve and the plug valve are both higher than that of the butterfly valve, the overall casting difficulty is relatively large, the cost is relatively high and the cost is relatively suitable for the construction of small and medium caliber pipes. With the development of science and technology, The feasibility of using ball valves for large-diameter pipes is worth exploring.
2 water supply pipe network in the use of the valve (1) stem is an important part of the water supply pipe network system, in practice, the general choice of stainless steel stem, stem nut can choose cast aluminum bronze, the strength and hardness of the nut Need to be greater than the stem, in order to meet the requirements of hoist work, need to work on the control valve pressure, hoist torque control. In order to solve the practical work requirements, we must optimize the valve structure design, to achieve enhanced component combinations to enhance the contact surface of the moving parts of the overall finish, the opening and closing resistance decreased.
Sealed packing is a key impact factor affecting valve drip. In the packing maintenance module, large-diameter valves are prone to water stop conditions, resulting in unnecessary cost loss. In order to solve practical work requirements, we must prompt the packing durability to ensure The appropriateness of materials, to avoid the situation of its excessive aging, the control of the material wear and tear. Valve shaft packing can be used for three applications of fine rubber ring wear, valve body, valve cover assembly concentricity control to ensure a good finish rubber contact surface, this valve shaft seal mode has a good working efficiency , Its elastic graphite packing is relatively simple, can effectively reduce the opening and closing torque.
(2) The pipelines in the water supply pipe network usually have the characteristics of dark burial. In order to solve practical problems, it is necessary to carry out the valve well protection mode, set the valve mortise and tenon end caps, Control, in accordance with the clockwise turn off the valve, the valve opening and closing degrees need to have marked plate, to meet the actual observation requirements of the user, in order to ensure the marked disc of the eye-catching nature, you need to cast the scale casting, phosphor Brushing. In this session, can not use aluminum and other materials, need to be done before the installation of the pointer and the opening and closing limit debugging, and to lock it in the use of small and medium-sized gate valve module, the opening and closing of the logo plate design.
(3) The valve belongs to a kind of product. The appearance quality is an important manifestation of the product image. In order to meet the work requirements of the current water supply network, the valve must be well protected against corrosion. The valve is an important conveying equipment for drinking water equipment and needs to be guaranteed Body lining material non-toxic, corrosion resistance, wear resistance, the need to ensure the overall finish, the resistance of water flow control. In the application of butterfly valve butterfly valve plate, plate material, bolts and other material with obvious differences, prone to a series of electrochemical corrosion conditions, is not conducive to improving the overall sealing of the valve, in order to solve the actual problem, you need to do Good lining covering system sound.
In order to meet the requirements of the above work, it is necessary to carry out the shot blasting of variable speed gearbox, bonnet, valve body and the like, to carry out the electrostatic spraying non-toxic epoxy resin mode, and some manufacturers conduct anti-rusting in the valve body Brush, this anti-rust paint contains a series of harmful substances, does not meet the relevant health requirements. In order to enhance the work efficiency of the water supply network, optimization of the valve procurement model is necessary.
(4) In order to improve the convenience of the valve assembly and disassembly agreement, the need for pipe and valve Retractable retractor between the installation, the valve manufacturing process, some companies use live flanges to replace the Retractable retractor, the valve manufacturer should A lot of production with a fixed expansion valve products, this product has a higher production costs, which to some extent affect its promotion and use. Pipeline construction is a more complicated system. Some construction managers place too much emphasis on the material supply problem. When starting the module, the auxiliary equipment of the valve is brought to the site and the valve is exposed to the sun and the rain for a long time on the construction site. The lack of good maintenance and supervision procedures , Easily lead to the emergence of valve quality problems. In the pipeline construction module, it can be used to replace double pipe connection mode. After the pipe construction is completed, clean up the debris in the pipe to achieve the coordination of the transportation and installation of the valve, and finally finish the completion of the well.
(5) technical materials, valves, valves need to include the factory manual, valve purchase qualified inspection, valve position card, valve repair records and other information. When the street changes, the valve card also need to be timely updates, in this session, the need for GIS management system to achieve the overall operation of the valve to improve the quality of management to achieve close the valve tightness control module to avoid the valve stem Sealing stuffing string at the situation occurs, the valve opening and closing need to follow the principle of portable, daily operation of the valve to do the work of the valve prior to the opening and closing operation of the single approval records, and do a good job of the valve regular weekly inspection status of the timely record . For long-term operation of the valve, according to the size of its caliber, the corresponding weekly inspection cycle to develop. In the work of water supply network, in view of the actual problems, the application of large and medium-sized repair programs to ensure the timely handling of valve failures, emergency valve failure prepared to develop programs to meet the special circumstances valve work requirements.
(6) In order to meet the actual work requirements of water supply network, the overall design of valve well masonry needs to be optimized to ensure the non-destructiveness of the well cover, achieve the perfect connection with the road surface, and control the accuracy of the valve hole position to avoid Well debris situation in the valve well work module, the need for strong blast, ventilation measures carried out to avoid staff hypoxia and asphyxia conditions. In the working module, large-caliber valves need long-term convection of air in the well technology, pressure embedding problems to solve the problem of covers lost, damaged and so on, to strengthen the valve management system.
3 Conclusion Through the integrity of the valve work system, to meet the current urban water supply network requirements of the work to achieve the steady operation of urban modernization.
References [1] Li Hongyan. Talk about the design of modern residential water supply and drainage [J]. Inner Mongolia Science and Technology and Economy, 2004 (17).
[2] Zhou Bingcheng. Residential water supply and drainage design [J] .Panzhihua University, 2006 (05).
Abstract: In order to meet the current requirements of water supply network, it is necessary to improve the overall system of valves. To open the valve, the control of the closure of the section, effectively reducing the work of the pipeline problems. The article analyzes the problem of water supply network valve, through the on-the-spot investigation and on-the-spot investigation mode carries on the optimization of the valve usage plan.