| 摘要 |
The clack valve consists of a deformable elastic membrane 5, made from elastomer, which is held on its periphery between an upstream element 1 and a downstream element 3. The membrane 5 has, towards its central part, a slit 6. For an upstream pressure greater than a predetermined value, the slit 6 remains closed and the passage of the fluid is prevented. When the predetermined pressure is attained, the lips of the slit 6 open and let the upstream fluid pass. When the pressure falls below the said predetermined value, the slit 6 closes again by elasticity and re-establishes sealing. The device applies to the production of single- or dual-action valves and non-return connections. <IMAGE>
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