Automatic constant pressure differential valve + electric control valve is currently used to solve the balance of air conditioning water system is a very good way, when the system pressure changes, the constant pressure valve can be changed by its own flow area so that the electric control valve at both ends The pressure remains the same, so that the CV value of the control valve is always one, so as to ensure that the electric control valve has been running in the best conditions, the real change in water temperature and has nothing to do with the pressure, you can guarantee access to air conditioning The tank of water is the amount of water you need at any one time. Plexus makes the system more superior performance, more convenient to maintain. The use of an automatic constant pressure differential valve + electric control valve at the end of the system eliminates the need for extensive use of balancing valves in stratified control, which results in superior system performance and easier maintenance. Automatic constant pressure differential valve + electric control valve is a variable flow air conditioning water system, an important guarantee for hydraulic balance, the system uses automatic balance proportional integral control valve can bring you many benefits. 1. Since there is no need for system debugging, so save a lot of trouble, save a lot of time and shorten the completion date. 2. Because you do not have to use the valve group and the valve for hierarchical control, so you save more pipe, insulation materials and installation costs and time. 3. The water system at all times in a balanced state, so regardless of installation of staged construction or equipment used in stages will not affect the balance of the water system. 4. The need to change the design of the water system in some areas for later use or even after commissioning will not affect the water system design in other areas and will not affect the water system balance in other areas. 5. Since the entire system is in a state of dynamic equilibrium, the refrigeration unit and the pump will operate in the most energy-saving state, which saves a lot of operation and maintenance costs. 6. As the system flow balance is automatic, making installation and maintenance more convenient and eliminate the possibility of human error and undermine the balance. Automatic balance proportional integral control valve and static balance valve comparison Static balance valve is actually a man-made precise set of opening valve, he adjusted by the local resistance to air conditioning water piping system to solve part of the hydraulic balance . At the beginning of the system commissioning, all the valves of the system are at a certain opening. The commissioning personnel set the opening of each static balance valve one by one according to the original mathematical model (the valve opening is set to a certain value after setting) , But for different water systems its resistance distribution curve is definitely not the same, and it can not be measured. Therefore, the static balance valve can only fuzzy, qualitative control of water flow. For a variable flow air conditioning water system, each air conditioning tank of water changes are random, the entire pipeline pressure changes are unpredictable, the valve opening is also random changes. Therefore, we can get from the formula G (flow) = CV * A (valve flow area) * â–³ P (pressure difference between the two ends of the valve): Since the static balance valve is adjusted, the opening degree is constant. Therefore, changes in the pressure differential across the valve will inevitably result in changes in the flow through the static balance valve. So in a variable flow system when the system pressure changes when the static balance valve is unable to solve the problem of hydraulic imbalance. Will still cause the system over-current and under-current.