In this paper, the differential pressure control valve in the household metering heating system in the 3 application solutions were analyzed, selection principle of the scheme is given, and pointed out the double-barreled household metering heating system for hydraulic calculation in the design condition, the natural role of the pressure head can not be considered, indoor and outdoor system should use different programs.
In the household metering heating system, to make full use of household appliances, lighting and the freedoms of the human body heat, is usually installed preset setting temperature control valve in each group of radiator, so the whole system is a variable flow operation, the role in the temperature control valve on the pressure with changing flow changes. When the actual pressure may produce a greater temperature control valve noise, especially in the room heat load is small, the temperature control valve will frequently switch, oscillation. Vibration not only cause unnecessary wear and tear, also led to the return water temperature, and the influence of system in the other temperature control valve, so a well-designed double-barreled household metering heating system, one should heat the right degree of each temperature control valve used in the system is always greater than or equal to 1, the actual temperature control valve with pressure on the other hand, the difference should also be maintained in its allowable range.
Differential pressure control valve, also known as self-operated pressure control valve, in the variable flow system, it through the induction heating pipe system of two points of pressure, can maintain a constant pressure charged loop to ensure the accused, loop regulating valve in the normal work, then the household metering heating system, control valve should be how to layout? Usually there are three options: A. differential pressure control valve is located in the building heating only in the introduction of export, control heating inlet pressure is constant. B. in time for the next dual-pipe system, differential pressure control valve in each group shared vertical starting end tube, control stand pipe pressure drop for the given value. C. differential pressure control valve is arranged into every household, control indoor system pressure difference is constant.
At present, in practical design, the 3 options on how to choose, a lot of controversy, only the thermostatic valve to ensure smooth work, project 1 worst, but at least their initial investment; option 3 best, but the initial investment is highest; scheme 2 is between 1 and 3 between scheme. The following are some analysis for the 3 scheme, the hope that engineers design, and provides some useful suggestion scheme selection. It should also be clear is: This article discussed the double-pipe heating system is indoors, outdoors for dual-pipe system.
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