With the development of China's capital construction, the construction of large-scale national projects has led to the increasing number of valves for electric power, petroleum, chemical, urban supply and drainage systems, especially the use of butterfly valves. China's production of metal hard seal butterfly valves can be divided into two categories from the sealing structure, one is the elastic hard seal structure, and the other is the multi-layer hard seal butterfly valve. The production diameter of elastic hard sealing butterfly valve is generally below DN500, and the large diameter is mostly multi-layer structure. The butterfly valve below DN500 is the largest, so there are many problems encountered by users when using it. Here, the problems that often arise are summarized and guided, and the correct installation and use are guided.
Second, the elastic structure analysis and problems
The elastic structure hard seal butterfly valve is composed of main parts such as valve body, valve plate, valve stem, elastic valve seat and pressure ring.
The structure and function of the pressure ring: the side of the pressure ring is the sealing surface of the valve body and the sealing surface of the pipe flange becomes the sealing pair, and the bolt hole is in the side surface, and the pressure ring is pressed by the bolt to fix the valve seat, and the valve body is simultaneously Connected together to form the total structural length of the valve.
Due to the screw hole on the side of the pressure ring, the effective sealing surface diameter is reduced. From the case of the user using the flange, most of the flat flanges are used, and the internal passage is also nominally 10 to 20 mm. In this way, the effective sealing surface is reduced. If the valve of the installation process is not identical to the pipe flange, the misalignment will be pressed against the bolt hole. At this time, the inner side of the hole in the pipe flange exposes the bolt hole, causing leakage here. The leak is characterized by the flow of media from the back of the pressure ring.
Third, the special flange
At present, the state does not have the corresponding special standard for the elastic hard-seal butterfly valve. According to the current national standard, under the condition that the standard size specified by the flange is unchanged, the socket type is adopted. The inner diameter of the flange is basically the same as the nominal passage, so as to increase the effective sealing surface, it also provides favorable convenience for installation, and ensures the normal use of the valve.
Here, the user is reminded that when using the elastic hard sealing butterfly valve, the paired reverse flange must use a special flange, especially the pipe flange matched with the valve body pressing ring surface, and a special flange must be used.
4. The direction of the arrow on the valve body refers to the direction of the pressure of the medium. Generally, the direction of the arrow cast on the valve body refers to the flow direction of the medium. After the user sees the arrow, it is logically installed in the direction of the arrow according to the flow direction. It has become a habit, and it is easy for the installer to accept such instructions. There is nothing wrong with the national standards. However, in the case of a butterfly valve with an eccentric structure, there are some problems in such installation. The following is an example: the eccentric butterfly valve is installed in the same direction as the flow direction of the medium. The medium in the tube is liquid. If the valve is closed, if the pressure in the original medium inlet direction is When the reduction or zero, the outlet medium has a reverse flow backward. If the medium is at a high level and the pressure is greater than the inlet pressure, the valve is subjected to the reverse pressure because of the ordinary hard seal butterfly valve. The use of the valve for one-way use is not conducive to the sealing of the butterfly valve, and leakage will occur. From the above example, it is concluded that the arrow direction of the butterfly valve body refers to the pressure direction of the medium. Before installation, the user should clearly know the direction of the medium pressure after the valve is closed. The direction of the arrow of the free valve body is consistent with the direction of the medium pressure to achieve correct use, and the sealing performance is maintained in good condition.
V. Elastic hard seal butterfly valve to the user's acceptance check The user is very necessary to do sampling or all inspection of the purchased valve. The quality inspection of the product is: first, the quality of the product is checked, and second, the valve is not reduced after installation. The necessary repairs and updates, a high success rate of installation. However, the user did not pay attention to the test of the hard-seal butterfly valve during the sampling, which caused the quality of your law, doubt or rejection. Where is the reason? The screws on the pressure ring are 4, 6, 8, and 12 according to the size of the caliber, and the bolt diameter does not exceed M10 at the maximum. These screws are mainly used for fixing the elastic valve seat, and can not bear the full medium pressure. When the valve is installed on the outer flange bolt of the pipe, the full medium strength can be withstood. Due to structural reasons, the detection operation has a difference in acceptance and leakage occurs. It is common for the user to notify the manufacturer of the failure. After the communication, the product can pass the test smoothly, and there is no problem in use. Therefore, what should be noted here is to better understand and use the elastic hard seal butterfly valve for communication.
When testing the elastic hard-seal butterfly valve, lay the side of the pressure ring upwards, and place a pressure plate on the plane that is the same size as the outer flange and the valve. If the tester is used, the pressure claw should be pressed. On this platen, the pressure is evenly distributed on the pressure ring on one side of the valve body. If the blind plate is used for testing, the general-purpose clip-on elastic hard-seal butterfly valve is tested by two-piece flange-clamp clamping. The flange-type elastic hard-seal butterfly valve sometimes has a flange for the user to use for convenience. Fix it with the valve bolt. At this time, the fixing screw on the pressure ring on the valve body will bear the full pressure of the medium. As mentioned above, these screws can not bear the pressure of all the media, so use the blind plate. The valve does not leak during the test, and it is basically the same as the actual use.
The above points are often encountered during the installation process. If you understand our valve structure, it will give you the convenience of installation and the correct use of the elastic hard seal butterfly valve. Recommended: high performance butterfly valve, high performance ball valve, hard sealing butterfly valve http://
HIDEEP Provides A Wide Rang Of Distinctive bathroom accessoris With Unique Design To Meet Customers Individual Requirements.
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2. High quality.
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HIDEEP Product line |
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Product Information |
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Product description |
bathroom accessoris |
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Brand name |
HIDEEP |
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Material |
Brass |
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Material analysis |
Cu≥59% |
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Salt spray test |
24 hours |
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Quality guarantee |
5 Years quality guarantee |
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Application |
For family bathroom, hotel bathroom and so on |
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Certification |
ISO9001, CE |
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OEM and ODM |
Acceptable |
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