| 摘要 |
<p>A check valve module (10) includes two end surfaces (18, 26) and two check valves (40a, 40b). One check valve (40a) permits flow in only one direction between the two end surfaces (18, 26), the other chekc valve (40b) permits flow only in the other direction. Between the two end surfaces, a sealing ring (30) is provided on the outer surface of the module (10).</p> |
