| 摘要 |
A throughflow valve (1) comprising a valve seat (2) and a valve body (3) is intended to permit a given flow of fluid to pass therethrough when the valve is closed. To this end, the mutually abutting surfaces (2a; 3a) of the valve seat and/or the valve body are irregular or roughened, these irregularities having a size of 20-100 .mu.m. The invention also relates to a mould tool provided with corresponding irregular or roughened surface created by a so-called sparking operation.
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