How to determine the static pressure life of fluorine-lined butterfly valve

Keywords: fluorine-lined butterfly valve In the 1930s, Americans invented the butterfly valve. In the 1970s, the butterfly valve was introduced to China. The Chinese gradually became familiar with this type of valve. At present, the butterfly valve above DN300mm in the world has replaced the box. Compared with the box valve, the butterfly valve has the advantages of short opening and closing time, small operating torque, small installation space and light weight. Fluorine-lined butterfly valve is a kind of butterfly valve, which is widely used in the transportation of liquid and gas (including steam) in various types of industrial pipelines, especially in the use of severely corrosive media, such as: sulfuric acid, hydrofluoric acid, phosphoric acid, Chlorine, strong alkali, aqua regia and other highly corrosive media. In this article, we will introduce how to determine the number of static pressure life tests for fluorine-lined butterfly valves: 1. Termination of the test 1) The valve stem packing cannot keep the seal, other parts of the valve body leak, etc.; 2) During the sealing test inspection, the sealing performance cannot meet the standard requirements ; 3) The valve stem, stem nut and other parts of the gate valve are worn, and the opening and closing operation cannot be performed normally or the opening and closing operation torque changes greatly, which does not meet the requirements of 1.2-8>. 2. The number of static pressure life tests 1) If there is an abnormal situation or the performance does not meet the standard requirements during the test, the number of opening and closing cycles corresponding to the termination of the previous inspection shall be the number of static pressure life tests. 2) After reaching the required number of tests, when the performance of the fluorine-lined butterfly valve meets the standard requirements, the number of tests is the number of static pressure life tests. During the test, if there is an abnormal situation, the fluorine-lined butterfly valve needs to be adjusted. The specific adjustment steps are as follows: 1. When collecting data, do not make any adjustments to the pressure release device. After any change or deviation from the test conditions, sufficient time should be given to allow the flow, temperature and pressure to stabilize before data collection. 2. Preliminary tests shall be carried out to determine that the specified error limits for final displacement measurements can be met using specified instruments and procedures. The error analysis after the test should also be carried out, unless the parties to the test agree and confirm that the specified instruments and procedures, including the discreteness of the data, are used and performed in accordance with the test specifications, so as to confirm that the error determined by the preliminary test is still valid after the test. . Error determinations shall be documented by the laboratory for review. 3. The test records should include all observations, measurements, meter readings and meter calibration records of the test object (when necessary, the original test records should be kept by the institution conducting the test. The retention period is not less than 5 years. All test records A copy of the test should be submitted to all parties involved in the test. Corrections and corrections should be recorded separately for manned tests.
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