Thermostatic valve

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, Temperature control valve 1. Structure and working principle of the radiator temperature control valve. The temperature control in a user’s indoor space is achieved through the radiator constant-temperature control valve. The radiator thermostatic control valve consists of a thermostatic controller, a flow control valve, and a pair of connectors; the core component of the thermostatic controller is the sensor unit, namely the temperature bulb. The thermal bulb can change its volume in response to changes in the surrounding temperature, which in turn causes the valve element to move, thereby regulating the amount of water flowing through the radiator and thus adjusting its cooling capacity. The set temperature of the thermostatic valve can be adjusted manually; it automatically controls and regulates the water flow to the radiator according to the set parameters, thereby achieving the goal of controlling the indoor temperature. Thermostatic valves are generally installed in front of the radiator, and by automatically adjusting the flow rate, they help achieve the room temperature desired by the residents. Thermostatic valves are divided into two-way thermostatic valves and three-way thermostatic valves. Three-way temperature control valves are mainly used in single-tube systems with bypass pipes; their flow division coefficient can vary within the range of 0 to 100%, offering a large degree of flow regulation. However, they are relatively expensive and have a more complex structure. Two-way temperature control valves are used in some double-pipe systems and in some single-pipe systems. The two-way temperature control valve used in dual-tube systems has high resistance ； The resistance used in single-tube systems is low. The temperature sensing element of the thermostatic valve and the valve body are generally assembled as a single unit, with the temperature sensing element itself serving as the sensor for the indoor temperature at the site. If necessary, a remote temperature sensor can be used ； The remote temperature sensor is placed in the room where temperature control is required, while the valve body is located somewhere in the heating system. 2. Selection and design of thermostatic valves: Thermostatic valves are the primary devices used for regulating flow in heating systems; other control valves serve only as auxiliary devices. Therefore, thermostatic valves are essential. A heating system cannot be considered a heat metering billing system if it does not have a temperature control valve. In the design of temperature control valves, proper selection is very important. The purpose of selecting a temperature control valve is to determine the KV value (flow coefficient) based on the design flow rate (under a known heat load) and the allowable pressure drop ； Then, the diameter (model) of the temperature control valve is determined by the KV value. Therefore, design catalogs or manufacturer samples must provide the relationship between KV values and diameter; otherwise, it is not convenient for designers to use them. In the selection and design of temperature control valves, it is by no means sufficient to simply choose a valve with the same diameter as the pipeline. Rather, it is necessary to create ideal pressure difference operating conditions for the selected temperature control valve during the selection process. The typical operating pressure difference for a thermostatic valve is between 2 and 3 mH2O, with a maximum of no more than 6 to 10 mH2O. To this end, it is necessary to specify the range of preset values for the temperature control valve in order to prevent noise generation and ensure its proper operation. When there are two or more valve sizes available for the same KV value, it is preferable to choose the valve with the smaller diameter, in order to improve the control performance of the temperature control valve.