conventional waterworks water making process from the raw water intake, flocculating settling basin precipitation, filtration process, until the final output water supply, water pump house is inseparable from the use of the valve. But in a different part of the requirements for the selection of the valve is very different. The main difference is that the diameter of the valve, the valve type and valve control method.

water valves in water system distribution

1, the craft of raw water for water valve

the head of the raw water valve is characterized by the valve diameter is larger, more operations, most belong to need operation only once in a year or even years, valve normally open or normally closed state for a long time. Therefore, from the control method is more than 95% of chosen manual valves, from which for gate valve or butterfly valve type, due to the head loss than butterfly valve gate valve, head slightly more than butterfly valve gate valve. Caliber is concentrated in the 1200 ~ 1600 mm, path of the inlet pipe of the head and the valve diameter is 3000 mm.

2, sedimentation tank valve

tank valve is mainly fill valve, water valves and isolation valves. Basic in a normally open state, water valve isolation valve in a normally closed state, basic operation once a year, so these two valves are manual gate valves, specifications distribution between 2200 x 1800 ~ 1200 by 840. And the tank inlet valve bear an important responsibility of water distribution, require adjustment is frequent, reliable performance, and distribution in each tank before, distribution is more scattered, adopt electric regulator with intelligent control system. It is to determine the amount of water in the tank and system balance, a key ring for water system was adjusted dynamically according to the water yield of system, is particularly important, and you also need to adjust PID dynamic tracing, then for the total travel time of the valve, allowing the start-stop frequency will have corresponding requirements.

3, filter Industrial Valves

the most common filter for four valve filter, this is also the most basic configuration filter. That no matter what kind of filter at least fill valve, drain valve, flush valve and water in the four types of valves. Now, of course, there are many five, six or seven valves filter, also equipped with a gas valve, filter water valve in the early or more equipped with a water inlet valve and so on. From the structure of the valve up to distinguish between water and flush valves usually choose butterfly valve, the main reason is that water and flush valves are installed on the pipeline within the pipe rack, and the water valve need frequent adjustment, and the intensity of flush valve will also have to adjust flush demand. And feed water and drainage usually through channels, and inlet valve and drain valve are basically choose gate valve. Filter the flush valve caliber valve diameter slightly larger than water, flush valve in DN600 ~ DN800 basically, while the water valve in a DN600 DN400. The size of the inlet valve and drain valve associated with channel size. On the control method of it, these four types of valves are controlled by electric or pneumatic control. But the water valve must be adjustable intelligent control mode, and sedimentation tank inlet valve requirements. Besides considering the integrated wiring and modular design method, can choose the control mode of a general linear filter valve or PLC control mode of the site. Province wiring space are the benefits of the former, the latter has the advantage that the separation of the single filter, easy to maintenance and management and transplantation.

4, pump valve

the main pump room inside the Industrial Valves on the pump unit inlet valve, water valve, valve and check valve. The first three generally choose butterfly valve, the difference lies in the control mode. Fill valve and valve repair you just need to manual valves, because they have a in a normally open state, a state in a normally closed, while the water valve stops at each open when the pump needs to be opening and closing, if consider to adjust water by water valve, make the operation condition of the pumps with different factors to meet the demand, the water valve is also need external regulation intelligent control device. Check valve to prevent reverse flow, and to avoid the occurrence of water hammer, usually choose silent check valve, slow close check valve with micro resistance. Sometimes choose multifunctional valve, integrating water check function.

water dosing system of valve

the characteristics of water dosing system determines the use on top of the valve diameter is small, small flow rate, but higher requirement to the flow control, high accuracy, adjusting speed, so usually choose flow regulating valve, the valve makes medium flow capacity is determined by the structure of the valve only, thus achieved a complete flow control. Additionally dosing system piping within the medium such as ammonium sulfate, sodium hypochlorite solution, which requires the valve also has the ability to resist corrosion. Dosing system also ball valves are used as switching valve, back pressure valve, etc.

valve selection step

define the technical requirements, namely to determine the pressure inside the piping, traffic.

according to the diameter of pipeline, site condition, choose the type of Industrial Valves, combined with the first step of the process parameters, choose the valve, according to the installation position of the valve at the same time, to decide whether to add extension tube.

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