The working principle and application of temperature control valve

Abstract: Thermostatic valve is the most important regulating device for the flow regulation of heating system. If a heating system is not equipped with thermostatic valve, it can not be called hot metering and charging system. In this paper, the structure and principle of thermostatic valve are introduced. By analyzing the flow characteristics of thermostatic valve, combining with the flow characteristics of radiator and the concept of introducing valve power, this paper expounds the thermal characteristics, thermostatic valve flow characteristics and valve power How to ensure the effectiveness of the radiator system adjustment under the combined action of degree and degree; introduces the installation plan of the temperature control valve; and finally elaborates the energy-saving effect of the temperature control valve. Keywords: temperature control valve flow characteristics of valve power measurement heat energy 1, radiator thermostatic valve structure and working principle of user temperature control is through the radiator thermostatic control valve to achieve. Radiator thermostatic control valve is a thermostat controller, flow control valve and a pair of connectors, of which the thermostat is the core component of the sensor unit, that temperature package. Temperature package can sense changes in the ambient temperature and volume changes, drive the valve spool displacement, and then adjust the radiator water to change the radiator heat dissipation. Thermostatic valve set temperature can be artificially adjusted, thermostatic valve will be set according to the requirements of automatic control and adjust the radiator water, in order to achieve the purpose of controlling the indoor temperature. 2, the radiator adjustment characteristics are determined by the radiator thermal characteristics, temperature control valve flow characteristics and valve authority jointly. Temperature valve in an opening under the flow and the ratio of full-flow G / Gmax is called the relative flow; temperature control valve in an opening of the trip and the whole trip ratio l is called relative travel. Relative stroke and relative flow between the relationship known as the flow control valve temperature characteristics, namely: G / Gmax = f (l). The relationship between them shows linear characteristics, quick opening characteristics, such as percentage characteristics, parabolic characteristics of several characteristics. For the radiator, from the point of view of water conservancy stability and heat regulation, the relationship between heat output and flow rate is a curve on a cluster. As the flow rate G increases, the heat dissipation Q becomes gradually saturated. In order to make the system have good regulation characteristics, it is easy to adopt the control valve with equal percentage flow characteristics to compensate the influence of the radiator's own non-linearity (1). The effect of valve authority on regulatory characteristics. The adjustable ratio R is the ratio between the maximum flow rate and the minimum flow rate that the temperature control valve can control: R = Gmax / Gmin Gmax is the flow rate when the thermostatic valve is fully open and can also be regarded as the design flow of the radiator; Gmin Temperature control valve valve size changes. In the radiator system, the thermostatic valve and the radiator are connected in series, so the adjustable ratio R is related to the valve power: R = Rmax (2) Taking a temperature control valve and a radiator as an example, the radiator Of the flow capacity of 5m3 / h, valve temperature valve is 88%, the actual adjustable ratio of 28, the corresponding flow adjustable range of 100% -4%. Radiator temperature difference in different import and export of heat actually adjustable range shown in the table. Import and export temperature difference (℃)

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