Automatic constant pressure differential valve electric control valve is used to solve the balance of the water system of air-conditioning is a very good method, when the system pressure changes, constant pressure differential valve can change the flow area of the electric control valve at both ends of the pressure remains constant, so that the control valve CV value is always one, so ensure the electric control valve has been in the best condition to run, truly content only with the change of temperature and pressure independent, can guarantee the water into the air at the moment is all you need water. Plexus and make the system better performance, easier maintenance. The system with automatic constant pressure differential valve at the end of the electric control valve eliminates the need for extensive use in the hierarchical control of the balance valve, so you can make the system better performance, easier maintenance.
Automatic constant pressure differential valve electric control valve is the important guarantee of hydraulic balance of variable flow air conditioning water system, self-balancing in the system using proportional integral control valve can bring you many benefits:
1 because of no need for system debugging, so save a lot of trouble, saving a lot of time, shorten the completion date;
2 because of the group without the use of valves and for hierarchical control valve, so save more of the pipe for you, insulation materials and installation costs and time;
3 the water system is in balance at all times, so regardless of construction or equipment installation phases stages will not affect the balance of the water system;
4 even if the later stages of the project put into operation after the change or some of the uses of water system and the need to change some of the regional, also won't affect other regions of the water system design, but will not affect the balance of water systems in other regions;
5 because the entire system in a state of dynamic balance, so the refrigeration unit and pump will be running the state saving, saving a lot of operation and maintenance costs.
6 as the flow balancing system is automatic, so more convenient to install and maintain, and eliminate the human operator error may undermine the equilibrium.
Comparison of automatic balancing valve and proportional integral static balance valve
In fact is a kind of man-made precise setting opening, he to solve the hydraulic balance of air-conditioning water system piping parts of the local resistance by the artificial adjustment. Early in the system debugging, the system all the valves are in an opening, commissioning a mathematical model based on the original one by one the opening set for each of the static balance valve (set up after the valve opening is a certain value), but for different water systems of the resistance curve is definitely not the same, but can not be measured. Therefore, the static balancing valve only vague, qualitative control of water flow. A variable flow air conditioning system, each air tank water change is random, the entire pipeline system pressure changes are also unpredictable, valve opening change is random. Therefore, we from the formula
G (flow) =CV*A (valve flow area) * (△ P differential pressure across the valve) can be drawn:
Because the static balancing valve is adjusted opening is a certain value. Therefore, the differential pressure across the valve changes, which will cause the change of the flow through the static balance valve. So it is unable to solve the problem of hydraulic misadjustment variable changes when the system pressure and flow in the system when the static balance valve in a. Will cause the system to the over-current and under-flow.
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