Balance valve characteristic principle

The balancing valve is a special function valve with good flow characteristics, valve opening indication, opening locking device and pressure measuring small valve for flow measurement. Using a special intelligent meter, input the valve type and opening value, and directly display the flow value flowing through the balancing valve according to the measured differential pressure signal. As long as the balance valve of the appropriate specification is installed in each branch and user inlet, And with a dedicated smart meter for one-time debugging, the traffic of each user can reach the set value. Balancing valve in the hydraulic conditions play a dynamic and static balance adjustment valve. Such as: static balancing valve , dynamic balancing valve . Static balance valve , also known as balance valve , manual balance valve , digital lock balance valve , double position control valve, etc., it changes the flow resistance through the valve to change the gap between the valve core and the valve seat (opening) The purpose of the flow, the object of which is the resistance of the system, can balance the new water quantity according to the proportion of the design calculation, and the branches will increase and decrease at the same time, still satisfying the flow demand of the partial load under the current climate demand. The role of heat balance. The dynamic balancing valve is divided into a dynamic flow balancing valve , a dynamic differential pressure balancing valve , a self- operating self-pressure differential control valve, etc. The balancing valve belongs to the category of the regulating valve , and its working principle is to change the gap between the valve core and the valve seat (ie, the opening degree). ), changing the flow resistance of the fluid flowing through the valve to achieve the purpose of regulating the flow. The balancing valve is equivalent to a throttling element whose local resistance can be changed. For an incompressible fluid, it is available from the flow equation. Compared with other valves, the balance valve mainly has the following characteristics: (1) Straight flow characteristics, that is, the flow rate is substantially linear with the opening degree when the pressure difference between the valve and the front is constant; (2) The precise opening degree instructions; (3) the degree of opening locking means, can not easily change the management of the non-opening; connection table, the flow rate through the valve and the differential pressure before and after the valve can be easily displayed. Although the balancing valve has many advantages, it still has many problems in the application of the air conditioning water system. If these problems are not solved well, the characteristics of the balance valve are not fully apparent. The function of the balancing valve is to regulate the predetermined flow rate of each distribution point (such as each building) within the system. A balancing valve is installed at the entrance to each building to allow a reasonable distribution of the total flow of the heating system.
The principle of the balancing valve is the counter-regulation in the valve body. When the pressure at the inlet is increased, the diameter is automatically reduced, and the flow rate is reduced, and vice versa. If reversed, this adjustment system will not work. Moreover, the regulating valve plate is directional, and the reverse pressure can even reduce or even close the flow. Since the balancing valve is installed for better heating, there is no problem with reverse loading. If it is a counter-installation, it is a human error, and of course it will be corrected.
The balance valve belongs to the category of regulating valve . Its working principle is to change the flow resistance of the fluid flowing through the valve by changing the gap between the valve core and the valve seat (ie opening degree) to achieve the purpose of regulating the flow. The balancing valve is equivalent to a throttling element whose local resistance can be changed. For an incompressible fluid, it is available from the flow equation. Kv is the valve coefficient of the balancing valve. It is defined as the flow rate (m3/h) flowing through the balancing valve when the differential pressure of the balancing valve is 1 bar (about 1 kgf/cm2). The valve coefficient when the balance valve is fully open is equivalent to the flow capacity of the ordinary valve . If the opening of the balancing valve does not change, the valve coefficient Kv does not change, that is to say the valve coefficient Kv is determined by the opening degree. By measuring the valve coefficients at different opening degrees , the balancing valve can be used as a throttling element for quantitatively adjusting the flow rate. When the pipe network is balanced and debugged, the pressure measuring small valve of the balanced valve to be commissioned is connected with a special intelligent instrument by a hose, and the meter can display the flow value (and the pressure drop value) flowing through the valve , and communicate with the instrument man-machine. After inputting the required flow value at the balance valve to the meter, the meter calculates, analyzes, and obtains the opening value of the valve when the pipeline system reaches the hydraulic balance . The balance valve belongs to the category of regulating valve. Its working principle is to change the flow resistance of the fluid flowing through the valve by changing the gap between the valve core and the valve seat to achieve the purpose of regulating the flow. 1. Should not arbitrarily change the balance valve opening degree pipe network system installation, and with the test conditions, use the special intelligent instrument to debug and adjust all the balance valves, and lock the valve opening degree, so that the pipe network achieves the hydraulic working condition balance . During the normal operation of the pipe network system, the opening of the balancing valve should not be arbitrarily changed, and in particular, the opening locking device should not be changed. 2. It is no longer necessary to install a shut-off valve. When a certain loop is repaired, the balancing valve on the loop can be closed. At this time, the balancing valve acts as a cut-off valve to intercept the water flow, and then returns to the original locked position after the inspection is completed. Therefore, if a balancing valve is installed, it is no longer necessary to install a shut-off valve. 3. When the system is added (or canceled), the loop should be re-commissioned . When adding (or canceling) the loop in the pipe network system, in addition to increasing (or closing) the corresponding balancing valve , in principle all new balances are established. The balance valve in the valve and the original system loop should be re-commissioned and set up (the branch balance valve in the original loop does not have to be re-adjusted). In air conditioning and heating systems, the hydraulic balance of the water circulation system as the energy distribution is very important. A balanced hydraulic system is the basis for meeting user needs and saving operating energy. In air conditioning and heating systems, cold (hot) media is delivered to each user by a closed piping system. For a well-designed pipe network system, each user should be able to obtain the designed water volume when the opening control valve (electric control valve, temperature control valve, etc.) has an opening of 100%, and each user changes the opening of the end control valve. Both the required flow rate and the mutual interference are obtained. Such a water system is a hydraulically balanced system, otherwise it is a hydraulic imbalance system, and the hydraulic imbalance is also called a hydraulic imbalance. This hydraulic imbalance is randomly changing and dynamic. This imbalance phenomenon static balance valve can not be solved, can only be solved with a dynamic balance valve .

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