Processing and Measuring Device for Sealing Ring Used in Triple Eccentric Butterfly Valve

Abstract

The invention relates to a machining measurement device of a sealing ring for a triple eccentric butterfly valve. The size is measured through a measurement rod and profiling, the maximum diameter size from the straight side to the inclined side does not need to be measured through a caliper after the theoretical size is in place, a user only needs to directly read readings of a thread dial of a thread dial plate which is supported on a measurement pin, the rotary center of the thread dial plate is as same as the rotary center of a main shaft of a machine tool after the size is in place, and accordingly the size is in place when the reading of the thread dial is zero theoretically, the theoretical size is ensured fundamentally and meanwhile the repeated precision of the measurement is improved and accordingly the measurement does not rely on the technical level of workers, the size accuracy is ensured, and the leakage level of the valve is ensured; the machining measurement device is particularly suitable for the high temperature, high pressure difference and two-way sealing situations and suitable for the coal chemical industry, power plant boiler system application situations; the structure is simple, the use is convenient, the repeated accuracy of the measurement is high, the measurement is simple, the dependency on the workers is not required, the interchangeability of the sealing ring is good, and the import is completely replaced.

Description

technical field [0001] The invention relates to a processing device for a sealing ring, in particular to a processing and measuring device for a sealing ring for a triple-eccentric butterfly valve, belonging to the technical field of valve processing and manufacturing. Background technique [0002] Triple eccentric butterfly valve is a commonly used valve equipment. At present, most of the sealing rings used in domestically produced triple eccentric butterfly valves are pure metal sealing rings. Since the processing size of pure metal sealing rings is difficult to achieve the theoretical size, it is difficult to use them from theory. According to the requirement of zero leakage, the sealing effect is not particularly good, and it can only reach level IV~V leakage at most. [0003] Under harsh working conditions such as zero-leakage sealing requirements, domestic triple-eccentric butterfly valve manufacturers basically use a multi-layer sealing ring structure of flexible grap...

AI Technical Summary

Problems solved by technology

[0002] Triple eccentric butterfly valve is a commonly used valve equipment. At present, most of the sealing rings used in domestically produced triple eccentric butterfly valves are pure metal sealing rings. Since the processing size of pure metal sealing rings is difficult to achieve the theoretical size, it is difficult to use them from theory. According to the requirements of zero leakage, the sealing effect is not particularly good, and it can only reach level IV~V leakage at most.

The multi-layer sealing ring structure is adopted by most manufacturers because graphite is easy to extrude and seal. Under the impact of high-pressure medium, flexible graphite is easily damaged, thus making the seal invalid; moreover, flexible graphite is dynamically sealed in a medium containing water vapor for a long time, and the service life is very short

Therefore, under harsh working conditions such as two-way sealing requiring zero leakage, especially in coal chemical industry large-diameter pipeline medium cut-off and power plant boiler steam system applications, the user unit and design institute generally adopt the imported method, on the one hand because of the important location; on the other hand On the one hand, there is a requirement for two-way sealing and zero leakage; on the other hand, it is not suitable for the graphite sandwich structure that is often used in China

[0004] In addition, the domestic processing of triple eccentric butterfly valves basically uses a caliper to measure the outer diameter, and the unique inclined cone structure of the triple eccentricity results in the maximum size from the straight side to the hypotenuse being only two points on the largest straight side and the largest hypotenuse Therefore, the measurement depends entirely on the hand feeling of the operator, and the measurement repeatability is very poor, and the measurement results of different people vary greatly.

The triple eccentric zero-leakage seal requires full surface contact, and the error in size will cause only one line of contact, so it is difficult to achieve the zero-leakage requirement, let alone the two-way zero-leakage seal requirement

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