The balance valve area by the variable flow of bile and the high-precision valve (± 5%) of the spring and the support devices pose. The role of poor compression spring automatic control valve flow area of the gall bladder the size, so that a constant flow through the valve.
2, valve work process:
When the pressure balance valve before and after the pressure is less than the minimum to start the spring is not compressed, the largest circulation. When the valve before and after the differential pressure valve in the scope of the work of compression spring bulbs into the working state, bile flow through the valve on both sides of the hole and geometry-based channel flow; courage as a result of valve movement on both sides of the channel flow geometry also changes - Valve's ever-changing flow of the area, in the framework of the pressure remained constant water flow. When the pressure balance valve beyond the scope of work before and after, the gall bladder completely compressed valve springs, valve bile flow only from the flow on both sides of the hole, when the valve into a fixed gall regulator, flow and pressure is directly proportional to, with the pressure poor increases.
Dynamic balance valve with the pressure of certain restrictions on the scope of the largest air-conditioning end equipment flow, automatic constant-flow characteristics of workers in large type, complex, air-conditioning load is not constant heating of the project, simplifying the debugging of the system have been achieved, and to shorten the debugging时间. Different way, particularly in the use of water balance valve system can be easy to achieve a balance of hydraulic conditions to meet the design requirements of the ambient temperature, and air-conditioning systems can be run in the terminal equipment from the other end of the start and stop interfering.
Fourth, the dynamic balance valve in the actual engineering
1, regional heating
Dynamic heat balance valve at the entrance to ensure that the flow system.
Indoor heating systems, thermostatic valves to ensure that the required flow through each radiator, dynamic balance valve to ensure a constant flow of the riser to address the level of imbalance.
2, air-conditioning systems
Large-scale central air conditioning system, the air-conditioning equipment (air handler and fan coil) set the end of balance valve, through the three links (or Two) for electrical equipment to ensure that the flow valve, balance valve to achieve the status of regulation of hydraulic works. In the cold and heat source, cooling towers, pumps, etc. When the design is limited when the pipeline. Balance valve to avoid the use of partial load set to ensure the normal operation of equipment.
Fifth, the design of air-conditioning systems due to the dynamic balance valve offensive problems
1, the dynamic balance valve only play the role of water balance, can not be used for load regulation
Due to a misunderstanding of the dynamic balance valve, balance valve that can be easily air-conditioning or heating load balance, the balance valve to replace the electric three-way valve or two-way valve. However, with the maintenance of the structure of the load or indoor load (personnel, equipment, lighting, etc.) of the dynamic change requirements of air-conditioning is also provided by the dynamic changes of water, such as people want to - not only to ensure that the requirements of the indoor temperature, but also played a savings role. In large air-conditioning system, air-conditioning set up after the balance valve; the start and stop all devices will not interfere with other equipment affected the water flow, balance valve has played a role in water balance; and electric three-way valve or two to reduce expenses, to the number of required full range of environmental load.
Currently, with electric self-control of dynamic balance valve has been available, according to the load demand for the implementation of the dynamic balance of energy-saving air-conditioning systems more easily achieved. Therefore the use of electrical control functions with the dynamic balance valve, water balance can be combined with load regulation, and set up the direct use of computer-controlled flow, but also simplifies installation and is easy to install in a small space.
2, dynamic balance valve settings should not be multi-polar
In air-conditioning settings, manual control valve is a multi-polar design. According to this approach set up a multi-polar concept of dynamic balance valve design is wrong. The reason is: if one or more of the lower device is turned off, electric valves, and a higher level to maintain the flow balance valve throwing unchanged, will result in the closure of the lower level did not increase the flow of equipment, not only increased the flow noise, it will also affect the use of functions, and also increased the economic investment unnecessary.
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