Correct use of the temperature control valve of th

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Correct use of radiator temperature control valve in a variety of radiator systems

correct use of radiator temperature control valve in a variety of radiator systems:

1. In most of the old radiator heating systems in China, vertical single pipe or double pipe systems are used

1) in the vertical single pipe downstream system, the radiator temperature control valve cannot be installed because the water of the first group of radiators flows through the next group of radiators, and each group of radiators is located on different floors. Consider transforming this system into a vertical single pipe crossing system, so that temperature control valves or manual control valves with good regulation performance can be installed in front of each group of radiators

2) in the vertical double pipe downstream system, due to the vertical imbalance problem, the radiator temperature control valve with preset function can be installed during the system transformation. The so-called preset function refers to the device with preset initial resistance on the valve body of the temperature control valve. The initial resistance of the temperature control valve can be set through this device. The initial resistance set between different floors is different, which can solve the problem of the research and development of the stable preparation technology of natural reinforced fiber to a certain extent; Straight maladjustment. However, the following work should be done in the actual use of this method; The designer should do a more detailed hydraulic calculation; During installation, the construction party shall carefully compare the water resistance streamline diagram provided by the supplier and adjust the temperature control valve to the accurate preset position; After the water supply operation, it can be adjusted individually according to the specific situation. Since the double pipe system adopts a high resistance temperature control valve (which will be introduced in detail later), and the preset adjustment further reduces the valve opening, it has high requirements for heating water quality, otherwise it is easy to cause blockage

2. In recent years, household heat metering technology has been continuously improved, and the household heating system has been widely used in the vast number of civil and industrial buildings. This system is also the most widely used indoor heating layout in the current design. The horizontal layout of radiator heating is mainly divided into several categories: horizontal single pipe downstream type (not allowed or recommended in the standard), horizontal single pipe crossing type, upper split double pipe type, lower split double pipe type, radial double pipe type, etc

1) horizontal single pipe downstream: the horizontal single pipe downstream system is similar to the vertical single pipe downstream system mentioned above. The heating hot water flows through the previous group of radiators and completely flows into the next group of radiators, so it is not suitable to install temperature control valves or manual control valves on each group of radiators. This system is equipped with a temperature control valve. It can be considered to install a temperature control valve with remote transmission at the front end of the water inlet of the first group of radiators, and place the remote sensor of the temperature control valve in the main rooms that need temperature control, such as the master bedroom and living room. The disadvantage of this arrangement is that the action of the temperature control valve will drive the change of the heating hot water flow of the whole room, and the signal collected by the temperature control valve is only the signal of one room. At this time, its indentation is also very small, so the room will have temperature fluctuations, and it is unable to carry out effective precision adjustment. In this way, it can also be considered to install a manual control valve with high quality and linear relationship between opening and flow at the front end of the first group of radiators, through which the system can be roughly adjusted. This kind of radiator arrangement is not allowed by the "standard", and we do not recommend it

2) horizontal single pipe spanning type: the horizontal single pipe spanning type is an indoor layout method that has been widely used in recent years. Its advantage is that it can accurately control the temperature of each group of radiators, which meets the personalized requirements of users for the room, and also meets the policy requirements of "household measurement and room temperature regulation". At the same time, some high-temperature hot water (without heat exchange through the radiator) flows into the next group of radiators, which improves the water inlet temperature of the next group of radiators and ensures the heating quality

compared with other indoor horizontal layout methods of household setting ring, single pipe spanning type is a relatively simple layout method with a wide range of adaptability. In specific applications, different temperature control valve products (including manual regulating valve) should be used. There are many different application types:

A, two-way temperature control valve plus crossover pipe. This method has simple structure and low cost. But there are also some problems in practical application. In many engineering projects, due to the indiscriminate use of high resistance two-way temperature control valve, the water inflow of radiator is too small. There are some wrong usages in some projects. In order to meet the water inflow demand of the radiator, a regulating valve must be installed on the crossing pipe to increase the resistance of the crossing pipe. Even if the low resistance two-way temperature control valve is used, the inlet coefficient of the radiator must be calculated. The inlet coefficient of the radiator is the resistance ratio between the partial passage of the radiator and the partial passage across the pipe. In the horizontal single pipe plus crossing pipe system, the resistance ratio is generally more than 30%, which can ensure the inflow flow of the radiator. However, this calculation is more complex

b, type of bypass temperature control valve

now in order to adapt to the indoor level, there will be a balance between the expected performance of the product and other properties existing before the addition of nano materials. The material replacement scheme of aging resistant PP has gradually appeared, and the application of pipe plus crossover pipe system, some manufacturers have introduced a special bypass temperature control valve, This valve combines the radiator channel (including temperature control valve) and the bypass branch into a whole, and the bypass branch becomes a bypass valve with adjustable resistance. Its advantage is that it simplifies the calculation and installation, and because the bypass valve is adjustable, it has a wide range of adaptability to the system and can be adjusted separately according to the specific situation

this bypass temperature control valve can also calculate the inlet coefficient of the radiator. At present, it has been gradually adopted in some engineering projects

c, other special types of temperature control valves

at present, there are many new types of radiators in the market. In order to cooperate with these new radiators, various special types of temperature control valve products also emerged

3) horizontal double pipe type

indoor horizontal double pipe type can also be controlled by installing temperature control valves in each group of radiator inlet pipes. With this arrangement, the heating quality is good, and multiple groups of radiators can be connected in series. Different radiators have little impact on the system through temperature control valve adjustment. However, whether the upper split or lower split horizontal double pipe arrangement is adopted, the indoor pipeline layout is more complex, which has a certain impact on the overall decoration and beauty of the room

this arrangement is the same as the vertical double pipe system. The greater the end resistance, the smaller the impact of system fluctuation on it. Therefore, the radiator temperature control valve with high resistance should be selected

4) radiation double tube type

this arrangement is also called "octopus type" arrangement, which also belongs to the category of indoor horizontal double pipe type. Install a water distributor/collector at the entrance of each household, and each loop of the water distributor/collector is connected to a group of radiators respectively. Its advantage is flexible layout, which is conducive to room temperature control, but the pipeline layout is more complex, and the cost is higher than the previous indoor layout methods. In this system, the high resistance temperature control valve should also be used with reference to the double pipe system. If the manual regulating valve with reliable performance is used, it can be installed on the water inlet end of each group of radiators or on each household water distributor/collector for centralized control

in August 2003, the Ministry of Construction issued the guiding opinions on the pilot work of urban heating system reform, which clearly stipulates that in the future, the new public buildings and residential houses in cities and towns that use central heating facilities must design and install a heating system with household metering and room temperature control functions, and implement the new method of household metering and charging according to heat consumption. In the 21st century, the broad masses of the people have continuously improved their requirements for energy conservation and thermal comfort, and the policy of household metering and room temperature regulation has also been deeply rooted in the hearts of the people. Radiator temperature control valve will also have a broader application prospect. However, it is not easy to install the temperature control valve at one time. It requires careful calculation and in-depth understanding of the product. Different types of temperature control valves are used for different systems. At the same time, good communication with the designer and manufacturer should be carried out during installation and later commissioning, and appropriate adjustments should be made according to the specific situation, so as to achieve the purpose of reasonable use

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