First, the self-flow control valve Self-work flow control valve is a new type of control valve, relative to the manual control valve, which has the advantage of being able to automatically adjust; relative to the electric control valve, which has the advantage of not requiring external power, the application Practice has proved that in the closed water circulation system (such as hot water heating system, air-conditioning refrigeration system), the correct use of this valve, you can easily achieve the system flow distribution; can achieve system dynamic balance; can greatly simplify the system debugging Work; you can stabilize the working status of the pump. Therefore, self-regulating valve heating and air conditioning project has a broad application prospects. Second, the structure and performance Self-acting flow control valve is the role of pressure changes in the import and export of the valve case, the flow through the valve to maintain a constant, so as to maintain in-line with the controlled object (such as a loop, a user, A device, the same below) constant flow, self-force flow control valve name more, such as self-flow balance valve, constant flow valve, self-balancing valve, dynamic flow balance valve, all types of self-flow Control valves, different structures, but the working principle is similar. Third, the structure and working principle Self-flow control valve from the structure that is a dual valve combination, which consists of a manual control valve group and the automatic balancing valve group, shown in Figure 1. The role of manual control valve is to set the flow rate, the role of self-balancing valve is to maintain a constant flow. For manual control valve group, the flow G = P2-P3 where Kv is the flow coefficient of the manual control valve port, P2-P3 manual pressure control valve port on both sides of the pressure difference. Kv depends on the size of the opening, a fixed opening, Kv is a constant, so long as P2-P3 unchanged, the flow G unchanged. The constant P2-P3 is controlled by the self-balancing valve set. For example, when the pressure difference between import and export P1-P3 increases, the valve group is automatically closed by the action of the pressure-sensitive film and the spring, so that P1-P2 is increased to maintain the constant P2-P3. On the contrary, P1- Then automatically balance the valve group open large, so that P1-P2 decreases, maintaining P2-P3 constant. Manually adjust the valve for each opening corresponds to a flow, opening and flow of the relationship between the test bench test calibration, and with the opening of the display and locking device. Fourth, the performance and features 1, according to the design or actual requirements of the set flow, the system can automatically eliminate the pressure fluctuations, to maintain the same flow; 2, to overcome the uneven system of hot and cold, improve heating (cooling) quality; 3, to completely solve the pressure drop near the end, the pressure difference of the remote small; 4, reducing the system of circulating water, reducing system resistance; 5, reducing the design workload, without the need for cumbersome hydraulic balance calculation; , Reducing the difficulty of network transfer, the complexity of the network transfer to simplify the work of a simple flow distribution; 7, eliminating the heat pipe network when switching heat flow redistribution; 8, the flow rate displayed on the test bench random calibration, flow ( m3 / h). Fifth, the technical parameters 1, medium temperature 0-150 ℃; 2, working pressure 20-600Kpa. Six, selection 1, according to the pipe diameter selection. 2, according to the maximum flow and valve flow range selection. Seven, the installation and commissioning 1, the flow direction of the medium should be consistent with the flow of the arrow body; 2, after installation according to their needs in line with the set flow; 3, check the pressure across the valve is in the working pressure range; 4, As far as possible to avoid the valve in the minimum flow state work; 5, the spring cover no sewage screw, should be regularly sewage.
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