Balancing valve in the heating water system

Heating and hot water system was going through the necessary hydraulic balance, but if the lack of quantitative regulation still appear hydraulic imbalance, leading to overheating of the room temperature Enthusiasm proximal end too cold, the phenomenon is quite common in the district heating network.

The circulating pump is most unfavorable loop configuration, the rest of the loop pressure drop is relatively small, called "enabling loop. As each loop pressure drop, the runtime system will automatically assign the flow parallel loop voltage drop, resulting in the most unfavorable loop outside the loop overcurrent water system is run in the large flow of small temperature difference. As achieve the static hydraulic balance of each loop, the range of the economy than the friction maximize favorable loop flow rate and pressure drop with the most unfavorable loop pressure drop difference is reduced outdoor pipe network in order to achieve balance. Loop voltage drop when the difference exceeds 15%, the regulations should set the hydraulic balancing device. In recent years, hydraulic balancing valve as hydraulic balancing device is widely used. Hydraulic balancing valve is divided into static and dynamic two.Heater Gas Valve
(1) static balance valve with manual control valve opening degree readings cursor locking device and flow characteristics known, with the function of shut-off valves. Installation of such valves can no longer set the shut-off valve. When the initial adjustment of the system, according to the design of the controlled object to the desired flow, pressure drop, more precisely by manually the spool adjustment to the desired degree of opening and can be locked, so that the voltage drop across the parallel loop to adjust to the most adverse loop voltage drop value so that the water flows parallel loop device assigned to design rated.
Project, due to the theoretical calculation of the value of the heating water system design is often associated with the actual error, different equipment pressure drop values ​​of the pressure drop and design of the on-site installation of equipment, and the installation often according to the site of the pipeline appropriate modifications. Regulating valve according to the design flow pressure drop, its accuracy deviation, which requires a lot of tedious repeated debugging in order to make the system tends coupling of hydraulic balance in engineering practice, which is more difficult. Set static balancing valve and set the traditional flow characteristics of a good cut-off valve, throttle compared to a clear advantage in the debugging process.
(2) dynamic balancing valve. Can be divided into self-Flow Control Valves and self-pressure balancing valve. Operated flow balancing valve is a self-regulating device over the flow area changes with the change of valve pressure at both ends. Valve pressure at both ends of its range of operating pressure differential spool opening degree will change with the role in the differential pressure across the valve and change the flow of the valve is always the same. If the pressure is less than the minimum working pressure or greater than the maximum operating pressure, the valve dynamic components not action. The valve is equivalent to a restriction orifice flow and increase or decrease with changes in the pressure at both ends. Operated flow balancing valves can be used in the constant flow loop, riser, horizontal piping systems and equipment should not be located in the variable flow of the pipeline.
Self-pressure balancing valve should be set in the variable flow system. Able to rely on external or charged object flow change the valve spring force to change the spool position to independently regulate the controlled object for the return water pressure constant. Differential pressure setting can be changed by adjusting the valve spring preload. Pressure balancing valve in variable flow systems are often located in between the buildings of district heating supply and return pipes, manifolds between.Gas Valve
Although the self-pressure balancing valve with electric control valve is an ideal balance of measures to be adjusted with the set of end equipment load, but the current price is still too high pressure balancing valve, so set what hydraulic balancing device and what regulation The program should be based on project investment and fluctuations in room temperature to allow the requirements of a reasonable choice, which not only satisfy the comfort requirements of both energy efficiency and economic rationality.
Reasonable, as long as the design of the water system automatically adjusts the device is properly configured and after careful debugging Practice has proved that the operation of the heating system can meet the design requirements.