How to choose the temperature control valve With the reform of the heating system, household heat metering and sub-room temperature control has begun to enter the implementation stage, the installation of thermal control valve in the cooling is already very common, with temperature control valve to achieve sub-room temperature control, It not only can save energy to the maximum, but also can meet the needs of different users to the indoor temperature to the maximum extent. It is a good thing to benefit the country and the people but how to choose the thermostatic valve is not completely for the user to grasp. If it can not be correctly Select the product, not only can not meet the demand, and may bring unnecessary economic losses to the user, this author based on their own application experience, in this release their own views, designed to give colleagues and users some helpful. Temperature control valve is installed in the radiator water supply pipe temperature adjustment (in fact, flow control) of a device. Divided into manual temperature control valve and automatic temperature control valve two kinds, automatic temperature control valve, also known as self-temperature control valve is a temperature sensor self-operated actuator and a special temperature control valve body composition. Temperature control valve body structure often straight through, angle valve two kinds of two-way valve. Two-way valves are mainly used in double pipe systems or specially designed new single pipe systems. In recent years, according to single-and double-pipe three-way thermostatic valve and the use of dark installation of single and double pipe system for the special four-way valve. These four-way hard work is now more common in imported products, such as GIACOMI-NI four-way valve, which not only applies to a variety of radiators, but also for single and double pipe systems, but also have to meet Installation of a variety of pipe connections. Thermostatic valves are usually manual, automatic two, the valve movement principle is very different. Manual temperature control valve is usually used spiral lift spool, the handle of the screw through the spiral into a linear displacement valve. The automatic thermostatic valve in order to adapt to the temperature sensor-specific self-acting linear movement of the implementing agencies, the spool movement is usually designed to automatically reset the linear displacement, so the two bodies under normal circumstances are not interchangeable. But there are interchangeable special design of the valve body can be universal, that is, with the automatic valve body Shuxin valve, plus a suitable manual screw lift mechanism, you can achieve manual, automatic common exchange between the two. This improvement is particularly suitable for China's national conditions, very practical value, in many current projects, in order to save the initial investment of developers, first installed a body with automatic temperature control function and comes with a special screw lifting handle, so that both Realized with 1/3 of the automatic temperature control valve costs? (The price is basically the same as manual temperature control valve) to achieve a manual temperature control valve, but also to the user in the future to achieve automatic temperature control upgrade space left. This product even in the imported products are rare, Jiekemini Italy in this regard in front of the market, providing this between the manual, automatic thermostatic valve called a double adjustment Temperature control with hardships, eight files set, with your indoor temperature settings, convenient. Worthy of the world's largest HVAC valve supplier. Due to the special nature of the valve between manual and automatic thermostatic valves, the choice is more complex, a complication which has been caused by the complexity of the business and the opportunistic salespeople opportunity. In this particular reminder is that in the current market there are many automatic temperature control valve of the supplier's sales staff will be equipped with a simple adjustment handle purely automatic temperature control valve body as a dual function of the temperature control valve to the user Recommended, and some users have adopted such a temperature control valve, which is not appropriate, there is a big hidden danger, so the automatic temperature control valve body is attached to the simple adjustment handle, but the design of the handle In order to meet the valve in the automatic temperature control valve installed before the temporary system for adjustment to meet the engineering test pressure test water only after the test pressure test water process is completed and replaced by automatic thermostatic valve head, It's temporary, so the simple adjustment handle borrowed from the body for the original fixed temperature control valve for ordinary thread spiral lifting. We all know that the simple adjustment handle because of its temporary, one-time, generally made of plastic, if the final frequent use as its adjustment, the wear of the thread is very fast, not to mention the normal heating system, the spool up and down Lifting is carried out under certain pressure conditions, even in the absence of pressure in the system, the valve spring pressure alone will greatly accelerate the wear of the thread handle, so the product as a shock upgrade to automatic temperature control valve Manual temperature control valve is not appropriate. The author studied the Italian Jiekemini can be upgraded to automatic thermostatic valve called the dual thermostat valve, and the biggest difference with other brands is that its adjustment handle is not a temporary one-time product, but specifically designed Of the end product with a durable application, the helical thread of the helical lifting profile is a special wear-resistant trapezoidal force, with a pitch of 4.5 mm. Long-term use is without any worries, of course, temporary use even more no problem. The general temporary adjustment handle borrowed thread fine seven fixed thread, the thread of the seven-shaped triangle, the Chinese silk company is only 1.5mm. This temporary handle rotation of three spool displacement in order to 4.5mm pitch with the trapezoidal thread circle, which means that you will be in the valve from the minimum open up to three times the maximum time, which often need to adjust the temperature control Valve inconvenience is also obvious. Below we study the automatic thermostatic valve, automatic thermostatic valve is usually divided into two parts of the valve body and the valve body, the valve body is generally used copper casting or hot forging production, the valve head temperature sensor generally have my solid liquid points: Solid is divided into two kinds: one is wax system, one is a thermal memory alloy. Currently on the market most popular solid sensor media for stone wax, very few thermal memory alloy. The following on the market feel the valve body and the valve head respectively for a brief introduction, for the selection of automatic temperature control valve for reference. Temperature control valve body: Copper casting has the advantage of being capable of casting complex shaped products with less mold costs and lower production costs, but the disadvantage is that there are many casting defects and the material has poor compressive strength. In contrast, High value, forging equipment complexity, increased production costs, but it can get high-strength products, the pressure capacity is much higher than the castings, while effectively avoiding the casting defects. Therefore, the less complex shape of the body, the professional manufacturers are using hot forging production of the valve body. However, there are some manufacturers using the casting method of production, which requires careful user identification. I think the thermostatic valve used on the heating is a simple valve body, hot forging is very suitable. In choosing the valve body, there should be a detail should pay attention to the design of many of the valve body for easier, straight through the valve body inlet and outlet in the same axis, so the design is simple, but the spool displacement space will be Affected, so this type of valve body displacement generally only 2-3mm. I studied the Italian Jiekemini automatic temperature control valve body, the straight-through valve body design is very unique, to ensure that the entrance, the same entrance under the same circumstances, the channel with a misaligned channel design, guilty to increase the spool Displacement space, making the spool displacement up to 4-5mm, which in the current design of automatic temperature control valve is rare. Increasing the displacement of the spool is more advantageous for the dirtier HVAC water. Too small displacement of the spool will easily cause blockage in the case of dirty warm water and serious scaling. Thermostatic valve head: Thermostatic valve head temperature sensor filled with medium generally have two kinds of liquid and solid, liquid and solid due to different production processes, the average manufacturer is usually limited by the production scale, often only use And the kind of process to produce liquid or solid valve head, only some large manufacturers will produce two kinds of valve head at the same time to facilitate customers to choose dribble two valve head difference, I think in HVAC applications should say no Many differences, if we must say something different, I think in the following areas: First, the volume is different. Liquid in general to achieve the same thermal expansion displacement requires a larger amount of liquid, so the temperature sensor larger, so the valve head larger, with a small body after the ratio of a little uncoordinated, it is better to use solid valve Some more beautiful head. Second, liquid sealing technology to be more complex, the cost of production relative to the solid to be slightly higher, so the sales price will tend to be higher. Third, the liquid valve head is more sensitive than the solid point, which is the only advantage of the liquid compared with the solid, but in the field of HVAC this typical large lag system, this advantage is not much effect. All in all, temperature-controlled valve heads, whether liquid or solid, fulfill the requirements of the EN 215 standard for sensitive time as long as they are qualified products. I have conducted a comparative measurement of the temperature sensors of two media in Jiegemini, Italy, at the National Construction Engineering Quality Inspection Center and found no notable differences. It is worth mentioning that Italy Jiekemini temperature control valve head installation is also very unique, the general temperature control valve head installation are threaded connection, but Jiekemini has adopted its own patented technology, rapid compression Type connection, fast and safe, effectively avoiding the manual screw connections easily loose defects. Jieke Minnie also has its own patent in the connection of the valve body, that is, PTFE self-sealing materials are hot on the joints, which facilitates the installation of different entanglement materials or hemp rope, thereby effectively improving Installation efficiency, and effective sealing. In summary, when you want to use the thermostat valve carefully selected, so you can make the best choice with the least amount of money, whether it is using manual, dual regulation or automatic temperature control valve, Italy Jiekemini Can be described as the perfect partner to choose from, complete product, good service, are so that you can be satisfied with the quality. In general, if the investment for the most provinces as a principle of choice, without considering the benefits of energy-saving thermostatic valve does not consider the future upgrade to automatic thermostatic valve, you can choose purely manual temperature control valve. If you use a small amount of investment, taking into account the future owner by the owner to upgrade to automatic thermostatic valve, then choose dual thermostat valve, this dual thermostat valve and manual thermostatic valve price is basically the same. If you want to do the job of choice, then you can directly select the automatic temperature control valve, the price is roughly three times the manual temperature control valve.
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