An overview, with the development of basic construction in China, national large-scale implementation project construction, the electric power, petroleum, chemical industry, urban supply and drainage system in the number of valves, such as more and more, especially the dosage of the butterfly valve is very big. Metal hard seal butterfly valves are produced in our country, from the seal structure can be divided into two categories, one is elastic hard seal structure, the second is multi-level hard seal butterfly valve. Elastic diameter generally below DN500, hard seal butterfly valve production of large diameter USES a multi-level structure. Below DN500 butterfly valve dosage the biggest, so users more problems when use it, in this, the problems are generalizations, and guide the correct installation and use of the two, the structure of the elastic analysis and the problem of elastic structure, hard seal butterfly valve by Industrial Valves body, valve plate, valve stem, resilient seated, main parts such as pressure ring. Pressure ring structure and function: the side of the pressure ring for the valve sealing surface with pipe flange sealing surface is sealed vice, side with bolt holes, using bolts compaction pressure ring up the fixed seat, at the same time it is an organic whole repeatedly with the body, constitute the total length of the structure of the valve. Because of pressure ring side screw aperture will effectively reduce the sealing surface of diameter. From the user's use of the flange, mostly with flat welding flange, Canon and the nominal pass after 10 ~ 20 mm. So use reduces effective sealing surface, if, valves and piping flange installation process different heart will displacement pressure above the bolt diameter, at this point, the pipe flange bolt holes, inner hole inside caused the leakage. Leakage characteristics for the medium flowing from the back pressure ring. Three, special flange at present, countries with elastic hard seal butterfly valve not corresponding special standard of flange, we according to the current national standards, in the case of the standards set by the flange size remains the same, its Canon adopt socket type. Flanges diameter and nominal menstruation basic same, this is to increase the effective sealing surface, and to provide favorable and convenient installation, and ensure the normal use. Here, to alert users when using elastic hard seal butterfly valve, the matching of the flange must use special flange, particularly with the valve pressure ring surface matching pipe flange, special flange must be used. Four, the direction arrow on the valve body refers to the direction of medium pressure is usually the body cast out the direction of the arrow, refers to the flow of medium, after the user see arrow, it according to the flow is consistent with the direction arrow, such installation has become a habit, installation is easy to accept the instruction, according to the standard provisions of the state of no error. But in the eccentric structure of butterfly Industrial Valves, this installation will sometimes appear some problems, said the following example: eccentric butterfly valve according to the flow direction of medium flow and consistent installation, tube medium is liquid, the valve is turned off, if the original medium pressure import direction, reduce or equal to zero, the export of medium in reflux flow back, if it is a high-level supply, medium to high pressure, the pressure is greater than the inlet pressure, the Industrial Valves is the role of reverse pressure, used for ordinary hard seal butterfly valve is a one-way valve, such use is conducive to sealing butterfly valve, and there will be a leak. From the above examples come to the conclusion: butterfly valve with the arrow direction refers to the medium pressure direction. User want to know that the valve is turned off before installation the direction of the medium pressure, free direction arrow direction and medium pressure valve body can be used correctly, and sealing in good condition. Five, the elastic hard seal butterfly valve to user acceptance notice user to purchase the valve do sampling or all of the test is necessary, do sampling observation about the quality of the products is: one is to control the quality of products, the second is to reduce unnecessary maintenance and update after installing the valve, install a high success rate at a time. But the user is in when sampling test of hard seal butterfly valve, some didn't pay attention to the places, caused to you that the quality of the produce, doubt or unqualified to refuse. Because of where is it? Screws on the pressure ring according to the diameter size has four, six, eight and 12, the bolt diameter does not exceed the largest M10. This a few screws mostly fixed resilient seated with, can't take all the media pressure, when the valve is installed in the pipeline outer flange bolt after compaction effect, can withstand all the dielectric strength. Due to structural reasons, there was a leak detection operations have different acceptance, users on the grounds that the unqualified notice factory is often the case, after communication products can be passed, and no problems in use. Therefore, matters which should be paid attention to under the validity for the user to better understand and use elastic hard seal butterfly valve for the communication.
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