Based On Value Engineering Thermostatic Mixing Valve R&D And Nationalization

With social progress and people's living standards improve, people are constantly seeking the comfort of their living conditions, in which the supply of hot water demand has become an indispensable one.From the use of safety considerations, the heat storage-type faces two major difficulties: on the one hand, the water temperature in a moderate state of Legionnaires disease can cause lung macrophages, in the past 30 years all over the world due to air conditioning, shower caused by moist air corps incidence of disease have occurred concentrate. According to Legionella survival under various temperature conditions. The water temperature is raised to above 60℃can eliminate Legionella; but on the other hand, the 60℃of water temperature directly to the client may cause severe burns, 45℃above the water temperature that can cause burns rapidly, 60℃of water temperature cause local burns within 7 seconds, 90 seconds, causing all the burns, and 70℃of water temperature within 1 second, resulting in partial burn for 10 seconds, causing all the burns.The national study found that way to solve this problem: the heating system water heating and storage tank at 60℃, and the temporary reduction in the use of the client before the hot water temperature to set the appropriate temperature, ie to avoid burns, At the same time to prevent the propagation of Legionnaires disease.Thermostatic mixing valve (Thermostatic Mixing Valve, short TMV), is a kind of energy and power without an external sensor can automatically adjust the completion of the ideal water temperature control valve. Thermostatic mixing valve to rely on the medium flowing through the valve and the pressure of its own, temperature-driven valves work automatically and requires no external power supply and the secondary instrument. Thermostatic mixing valve has three main functions: one can achieve 38℃to 55℃for any temperature setting, users need to adjust themselves according to hot and cold water mixing with water temperature; Second, with balanced pressure hot and cold water supply side or temperature fluctuations in water temperature to maintain a constant output function, that is not water temperature mixing valve, flow, pressure changes, can automatically solve the bath water temperature sensor in the balance of hot and cold water problems; Third, when the cold water abruptly, the thermostatic mixing valve can be shut down within a few seconds, hot water, act as "anti-scald" security protection.In addition, TMV in energy efficiency also play an important role. No regulations under the European DPR412/93 all the hot water storage type water supply system, hot water need to control the water temperature in the 48℃+5℃below, the user does not take into account not only burns, but also to minimize hot water heat loss in the pipeline, the user water-side to avoid unnecessary high temperature hot water wastage.In this paper, the function of value engineering cost analysis, the system of constant temperature mixing valve to the cost and structure analysis, summed up the innovative product design, product costs are reduced, function further improved.