| 摘要 |
PCT No. PCT/DE91/00010 Sec. 371 Date Oct. 8, 1991 Sec. 102(e) Date Oct. 8, 1991 PCT Filed Jan. 9, 1991 PCT Pub. No. WO91/12426 PCT Pub. Date Aug. 22, 1991.A tank-venting system has an adsorption filter (AF) with a venting line (BL) which can be shut off by means of a controllable shut-off valve (AV). The shut-off venting valve makes it possible to set underpressures and overpressures in the system in a concerted manner in order to check its operability. As a result, particularly reliable information relating to the operability can be obtained.
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