What Is A Radiator Temperature Control Valve?

- Aug 11, 2020-

Working principle


  Radiator thermostat-also known as: temperature control valve. In recent years, temperature control valves have been widely used in new residential buildings in my country. The temperature control valves are installed on heating radiators in residential and public buildings. The temperature control valve can set the room temperature according to the different requirements of users. Its temperature sensing part constantly feels the room temperature and automatically adjusts the heat supply according to the current heat demand at any time to prevent the room temperature from overheating and achieve the highest comfort for the user.


  The temperature control in the user's room is realized by the radiator thermostatic control valve. The radiator thermostatic control valve is composed of a thermostatic controller, a flow regulating valve and a pair of connecting parts. The core component of the thermostat is the sensor unit, that is, the temperature bulb. The temperature bulb can sense the change of the surrounding environment temperature to produce volume changes, drive the regulating valve spool to produce displacement, and then adjust the water volume of the radiator to change the heat dissipation capacity of the radiator. The set temperature of the thermostatic valve can be adjusted manually, and the thermostatic valve will automatically control and adjust the water volume of the radiator according to the set requirements, so as to achieve the purpose of controlling the indoor temperature. The temperature control valve is generally installed in front of the radiator to automatically adjust the flow rate to achieve the room temperature required by the residents. The temperature control valve is divided into two-way temperature control valve and three-way temperature control valve. The three-way temperature control valve is mainly used in a single-pipe system with a spanning pipe. Its shunt coefficient can be changed within the range of 0-100%. The flow rate adjustment room is large, but the price is relatively expensive and the structure is more complicated. Some two-way temperature control valves are used in double pipe systems, and some are used in single pipe systems. The resistance of the two-way temperature control valve used in the two-pipe system is larger; the resistance used in the single-pipe system is lower. The temperature sensor of the temperature control valve and the valve body are generally assembled as a whole, and the temperature sensor itself is the on-site indoor temperature sensor. If necessary, a remote temperature sensor can be used; the remote temperature sensor is placed in the room that requires temperature control, and the valve body is placed in a certain part of the heating system.


Effective energy saving


  The heating system is designed and calculated based on the calculated maximum heat load required under the lowest outdoor temperature. However, this design temperature of the temperature control valve only occurs for a few days in the severe cold season, which means that the heating system is running at full load only for these few days in the entire heating season. Generally speaking, the heat load required to ensure room temperature is much smaller than the design value, and the heat load is constantly changing. The daily heat load varies throughout the heating season. The temperature control valve can automatically maintain an accurate room temperature according to the predetermined requirements, and is not affected by climatic conditions. Install a temperature control valve in each room to ensure full use of the "free" heat radiated by sunlight, lighting facilities, machinery and the human body to achieve the effect of saving energy.


  Solve the problem of hydraulic balance in heating system


  The temperature control valve is an indispensable element in the high-level double pipe system, which can solve the problem of water conservancy balance in the pipe network.


  The composition of the electric temperature control valve: It is composed of an electric control valve, a temperature controller and a temperature sensor. The electric three-way control valve is divided into two types: converging valve and diverting valve according to the action mode of the fluid. The merging valve has two inlets and flows out from one outlet after merging. The diverter valve has a fluid inlet, which is divided into two streams and flows out from two outlets. The structure of the confluence three-way control valve is similar to that of the split three-way control valve. Its characteristics are as follows: 1. The electric three-way control valve has two valve cores and valve seats, and its structure is similar to that of a double seat valve. However, in the electric three-way control valve, when the flow area between one valve core and the valve seat increases, the flow area between the other valve core and the valve seat decreases. In the double seat valve, the flow area between the two valve cores and the valve seat increases or decreases at the same time. 2. The air opening and closing of the electric three-way control valve can only be achieved by selecting the positive and negative effects of the actuator. The change of the air opening and closing of the double seat valve can be realized by directly installing the valve body or valve core and the valve seat. 3. When the electric three-way control valve is used in a control system that requires fluid to be proportioned, it can replace an air-open control valve and an air-close control valve, so it can reduce costs and reduce installation space. 4. The electric three-way regulating valve is also used for bypass control places, for example, one way of fluid passes through the heat exchanger to exchange heat, and the other way of fluid does not exchange heat. When the electric three-way regulating valve is in front of the heat exchanger, the split three-way regulating valve is adopted; when the three-way regulating valve is installed behind the heat exchanger, the converging electric three-way regulating valve is adopted. Since the fluid flowing in the three-way valve installed in front of the heat exchanger has the same temperature, the leakage is small; the fluid flowing in the three-way valve installed after the heat exchanger has different temperatures, which is very important for the valve core. The degree of expansion is different from that of the valve seat, so the leakage is larger. Generally, the temperature difference between the two fluids should not exceed 150°C. Because a three-way regulating valve with a cage structure, with a balance hole, and cage guide, the unbalanced force can be greatly reduced. The early three-way control valve used a cylindrical thin-walled window and was guided by the side of the spool. Although it can reduce the unbalanced force, there is still a large unbalanced force when a stream of fluid is close to close (flow direction). Moreover, as the valve opening changes, the unbalanced force changes. The use of a cage structure with a balance hole can eliminate the unbalanced force and has a damping effect, which is conducive to the stable operation of the control valve. Due to the large leakage of the electric three-way regulating valve, two control valves (and a two-way connector) can be used to split or merge fluids, or to control the proportion of fluids in applications that require small leakage.

Butterfly-valve