Common sense of selecting the hottest temperature

2022-09-23
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Common sense of temperature control valve selection

according to the difference between single and double pipe systems, the structural form of temperature control valve body often has two most common two-way valves: straight through valve and angle valve. Two way valve is mainly used in double pipe system or new single pipe system with special design. In recent years, graduate students have produced three-way temperature control valves specially suitable for single pipe systems and special four-way valves suitable for single and double pipe systems with concealed installation. At present, these four-way valves are mostly found in imported products, Ruyi big Lijie Comini (giacomi-ni four-way valve is not only applicable to all kinds of radiators, but also to single and double pipe systems. At the same time, it also has a connection mode that can meet the concealed installation of a variety of pipes.

household heat metering and room temperature control have begun to enter the implementation stage. With the reform of heating system, it is very common to install temperature control valves on radiators. Using temperature control valves to realize room temperature control can not only save energy to the greatest extent, but also maximize To meet the needs of different users for indoor temperature regulation is a good thing for the country and the people, but how to choose the temperature control valve is not completely mastered by users. If you cannot choose the product correctly, it will not only not meet the needs, but also may bring unnecessary economic losses to users. Therefore, the author, based on his own application experience, expresses his own views, aiming to provide some useful assistance to peers and users

automatic temperature control valve is also called self operated temperature control valve or automatic temperature control valve. Temperature control valve refers to a device for temperature regulation (actually flow regulation) installed on the radiator water supply pipe. It is divided into two types: manual temperature control tensile testing machine with a jaw distance of 50mm valve and automatic temperature control valve. Also referred to as thermostatic valve, automatic temperature control valve is composed of self operated actuator of temperature sensor and special supporting temperature control valve body

temperature control valves are usually manual and automatic, and their valve action principles are very different. The manual temperature control valve usually adopts the screw lifting valve core, and the rotation of the handle turns into the linear displacement of the valve core through the screw. In order to adapt to the unique linear movement mode of the independent actuator of the temperature control sensor, the movement of the valve core of the automatic temperature control valve is usually directly designed as a linear displacement that can be automatically reset, so the two valve bodies are generally not interchangeable. However, there are also interchangeable valve bodies with special design that can be used for general purpose, that is, the valve body with automatic temperature control valve and a suitable manual screw lifting mechanism can be added to realize the general interchangeability of manual and automatic. This improvement is particularly suitable for China's national conditions and is of great practical value. In many projects at present, in order to save the initial investment of developers, a valve body with automatic temperature control function is first installed with a special screw lifting handle, which realizes the manual temperature control valve with 1/3 of the cost of the automatic temperature control valve (the price is basically equivalent to the manual temperature control valve), It also allows users to realize automatic temperature control in the future, leaving room for upgrading. This kind of product is rare even in imported products. Italian jecomini is ahead of the market in this regard. It provides this kind of double regulating temperature control valve between manual and automatic temperature control valves, which is called double regulating temperature control valve. It has eight gear settings, and the indoor temperature can be set by you, which is extremely convenient. It deserves to be the world's largest supplier of HVAC valves. Because of the particularity of this kind of valve between manual and automatic temperature control valve, the choice will be more complex. This complexity creates opportunities for some people who are not proficient in business and speculative salespeople. Here I would like to remind you that in the current market, many salesmen from suppliers of automatic temperature control valves recommend the pure automatic temperature control valve body with a simple regulating handle as a temperature control valve with double regulating functions to users. Some users also use such a temperature control valve, which is inappropriate and has great hidden dangers. Although such an automatic temperature control valve body is attached with a simple regulating handle, However, the design idea of the handle is to meet the temporary system adjustment to meet the engineering pressure test and water test before the installation of the automatic temperature control valve head. After the completion of the pressure test and water test process, it is replaced by the automatic temperature control valve head. Because of its temporary nature, the simple adjustment handle borrows the original ordinary thread on the valve body to fix the temperature control valve head for spiral lifting. We all know that simple adjustment should not use solid tools to stop clearing. Because of its temporary and disposable nature, the handle is generally made of plastic. If it is used as the final frequent adjustment, the wear of its thread is very fast, not to mention that when the heating system works normally, the up and down of the spool is carried out under a certain pressure, even in a system without pressure, The spring pressure of the valve core alone will greatly accelerate the wear of the handle thread, so it is inappropriate to use this product as a manual temperature control valve that can be upgraded to an automatic temperature control valve

the author studied the temperature control valve called double adjustment, which can be upgraded to a self-evident high-end quality dynamic temperature control valve in jecomini, Italy. The biggest difference from other brands is that its adjustment handle is not a temporary disposable product, but a specially designed end product with durable applications. The tooth shape of the screw lifting thread is a special stress-resistant trapezoid, with a pitch of 4.5mm. There are no worries about long-term use, of course, there is no problem with temporary use. The thread borrowed by the general temporary adjusting handle is a fine tooth fixed thread. The tooth shape of the thread is an ordinary triangle, and its pitch is only 1.5mm. The displacement of the valve core can be equivalent to that of the trapezoidal thread with a 4.5mm pitch by turning the temporary handle for three turns, which means that it takes three times as long to open the valve from the minimum to the maximum, which is also obvious for the temperature control valve that often needs to be adjusted

next, let's study the automatic temperature control valve. The automatic temperature control valve is usually divided into two parts: the valve body and the valve head. The valve body is generally produced by copper casting or hot forging. The temperature sensor of the valve head is generally divided into liquid and solid: the solid is divided into two kinds: one is made of wax, and the other is made of thermal memory alloy. At present, most of the popular solid sensor media in the market are paraffin, and few are thermal memory alloys. The following is a brief introduction to the valve body and valve head commonly used in the market for reference when selecting automatic temperature control valve

temperature control valve body: the advantage of copper casting is that it can cast products with complex cavities, with less mold cost and low production cost, but the disadvantage is that there are many casting defects and poor pressure resistance of materials; On the contrary, the copper forged valve body has high mold value, complex forging equipment and high production cost, but it can obtain high-strength products, and its pressure resistance is much higher than that of cast parts, while effectively avoiding casting defects. Therefore, for valve bodies with less complex shapes, professional manufacturers use hot forging to produce valve bodies. However, there are also some manufacturers that produce by casting, which requires careful identification by users. I think the temperature control valve used in heating is a simple valve body, and hot forging is very suitable

there is another detail that should be paid attention to when selecting the valve body. In order to simplify the design of many valve bodies, the inlet and outlet of the valve body of the straight through valve are on the same axis. This design is simple, but the displacement space of the valve core will be affected, so the displacement of the valve core of this kind of valve body is generally only mm. I studied the automatic temperature control valve body of jecomini, Italy. Its straight through valve body design is very unique. Under the condition of ensuring that the inlet and outlet are on the same axis, the inner cavity channel adopts the dislocation design, which effectively increases the displacement space of the valve core, making the displacement of the valve core as high as mm, which is rare in the design of the automatic temperature control valve at present. The increase of valve core displacement is very beneficial to the dirty HVAC water quality. Too small valve core displacement will easily block in the case of dirty HVAC water and serious scaling

temperature control valve head: the filling medium of the temperature sensor in the temperature control valve head generally includes liquid and solid. Due to different production processes, general manufacturers usually use only one of these processes to produce liquid or solid valve heads due to the limitation of production scale. Only some large manufacturers will produce two kinds of valve heads at the same time to facilitate customers' choice. As for the differences between the two valve heads, I think there is not much difference in the HVAC application field. If you have to say the differences, I think they are different in the following aspects: first, the volume is different. Generally speaking, a large amount of liquid is required to achieve the same thermal expansion displacement. Therefore, the volume of the temperature sensor is larger, so the volume of the valve head is larger, which is a little inconsistent with the proportion of the small valve body, so it is better to use a solid valve head. 2、 The sealing technology of liquid is more complex, and the production cost is slightly higher than that of solid, so the sales price is often higher. 3、 Liquid valve head is more sensitive than solid, which is the only advantage of liquid compared with solid, but in the HVAC field, a typical large lag system, this advantage has little effect. In a word, whether liquid or solid aluminum alloy detection is a kind of temperature control valve head for building profile detection. As long as it is a qualified product, it can fully meet the requirements for sensitive time in EN215 standard. I have made a comparative measurement of the temperature sensors of two media in jecomini, Italy, in the national construction engineering quality inspection center, and I found no obvious difference

it is worth mentioning that the installation of temperature control valve head of Italian jecomini is also very unique. Generally, the installation of temperature control valve head adopts threaded connection, while jecomini adopts its own patented technology, rapid compression connection, which is fast and safe, effectively avoiding the defect that manual threaded connection is easy to loosen

on the connecting joint of the valve body, jekomini also has its own patent, that is, the connecting joint is scalded with PTFE self sealing material, which facilitates the installation without wrapping raw materials or hemp rope, effectively improving the installation efficiency and achieving effective sealing

to sum up, when you want to choose a temperature control valve, you should carefully adjust it, so that you can make the best choice with the least money. Whether it is a manual, double regulating or fully automatic temperature control valve, Italian jecomini is a perfect partner to choose from. You can be satisfied with a complete range of products and thoughtful service

generally speaking, if the investment is the most economical as the selection principle, without considering the benefits of energy saving of automatic temperature control valve, and without considering upgrading to automatic temperature control valve in the future, pure manual temperature control valve can be selected

in consideration of the owner's upgrading to automatic temperature control valve in the future with little investment, the double regulating temperature control valve can be selected, and the price of this double regulating temperature control valve is basically the same as that of the pure manual temperature control valve

if you want to make a one-step choice, you can directly choose the automatic temperature control valve, which is roughly three times the price of the manual temperature control valve

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