at present, most of the central air conditioning water system for two controls, winter and summer. In order to facilitate the resistance of the water system balance, the design engineer usually adopts water system with the program as soon as possible. But in actual engineering, sometimes as a result of the limitation of conditions, the designers will design some different water system. In addition, although the system loop water system with a program, but the system also exist serious resistance unbalance between loop. For air conditioning water system is the resistance of the unbalanced situation, through a variety of adjustment to the balance, is the prerequisite to ensure the normal operation of air conditioning water system is to guarantee comfortable air conditioning system with low energy consumption of the foundation of the indoor environment. In order to improve the regulating function of air conditioning water system, adopting the good performance of regulating valve to replace the current is still widely used gate valve, globe valve, butterfly valve is imperative. At present, the balancing valve because of its comparatively complete function and good regulation performance, is more and more attention and welcome.

compared with other valves, balance valves mainly has the following features:

( 1) Linear flow characteristic, that is, under the condition of invariable pressure difference before and after the valve opening with traffic in a linear relationship.

( 2) Have the accurate opening instructions.

( 3) Opening the lock, the managers can't literally change the opening.

( 4) Body has two pressure holes, hose connection with intelligent instruments, you can easily show before and after the valve pressure difference and flow through the flow valves.

although balancing valve has many advantages, but it is in air conditioning water system still exist many problems in the application. If these problems is not good, the characteristics of the balancing valve is not fully revealed. The following balance valve used in air conditioning water system need to be aware of problems were discussed.

1 problem balancing valve should be paid attention to use the

1. 1 selection problems that should be paid attention to

some design engineers in selecting balance valve, for convenience, often by the pipe diameter directly determine the valve nominal diameter, 6 in five practical heating air conditioning design manual requirements so, actually this is not the best choice. Balancing valve and gate Industrial Valves, globe valve, butterfly valve, in order to ensure accuracy, give full play to the regulation, should satisfy the balance valve in the chosen under the condition of design flow rate and pressure difference, the opening control between 60% ~ 90%, so that can meet the requirements of the design discharge, and there was a certain adjustment allowance, therefore, the balance of the selected valve nominal diameter is not necessarily equal to the pipe diameter.

1。 2 write questions that should be paid attention to the design and application of

in the actual engineering design, there are few design engineer will balance valve need to consume the differential pressure and through the balancing valve's flow in the design and construction instructions given, this brought difficulty to the regulation of system, also lost the advantages of balancing valves. If the design engineer in design and construction instructions given parameters related to a balance valve, can provide convenience for the adjustment of the whole system. Of course, due to the influence of various factors of the system is installed, under the design of the opening, measure the actual flow is not necessarily equal to the design flow. Can according to the actual measurement of flow, to open or close small balance valve for fine-tuning, until satisfactory design flow value is reached.

1。 3 different main air conditioning water system and water pump export installation problems that should be paid attention to balancing valve

a air conditioning water system is often based on the characteristics of air conditioning load is divided into several districts, each district is composed of a loop water system. While the division of water system loop may adopt the same program, but still exist between each loop resistance unbalance problem, it must be in full until the Siamese balancing valve installed on each loop water mains, through the actual measurement of the return water temperature to adjust flow of each loop, make each link is running under the design flow rate. Balancing valve, of course, also can be installed on the manifold of the water supply mains, the premise condition that the pressure balance valve capacity to meet the design requirements.

differ as a result of the load characteristic of winter and summer, back to the water temperature requirement is different, each partition water system water flow rate changed, the division of water system to balance, therefore, in choosing the balance valve of each division of water system, winter and summer conditions should be fully considered, determine an optimal balancing valve nominal diameter, to ensure the accuracy of the winter and summer balancing valve adjustment. By the same token, the pump export manager installed on balancing valve selection also want to consider this problem. If the pump adopts frequency conversion adjustment, do not need to consider the problem.

1。 4 balancing valve installation problems

for the balance of flow through Industrial Valves before and after the water stability, guarantee the accuracy of measurement, balancing valve should be installed on the straight pipe, the balancing valve before and after each should have 5 times and 2 times the diameter of straight pipe diameter. If a balancing valve is located in the pump outlet section, before the valve is ten times the pipe diameter long straight section. The design engineer in the process of system design, in addition to pay attention to the above requirements, should be on the drawings or instructions to the design and construction. In addition, the design engineer in the construction units for technical clarificaiton, should highlight the balance valve installation requirements.

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