Detail:
Instrument valve is a pipe accessory. It is used to change the flow direction of the passage section and the medium, and to control the flow of the medium. Instrument valve sealing performance is the instrument valve seal to prevent the leakage of the capacity of the media, it is the most important technical performance indicators. The sealing part of the instrument valve has three parts: opening and closing parts and valve seat sealing surface of the contact between the two; filling and valve stem and stuffing box office; valve and valve cover. One of the former leakage is called internal leakage, which is often said to be closed, it will affect the ability of the instrument valve to cut off the medium. For the truncated valve, the internal leakage is not allowed. After two of the leakage is called the leakage, that is, the media from the valve leakage. Leakage can cause material loss, pollution of the environment, but also cause serious accidents. For flammable, explosive, toxic or radioactive medium, leakage is not allowed, so the instrument must have reliable sealing performance.
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