| 摘要 |
<p>A flow interruption type swimming pool cleaning device is described including a head having a flow channel 4 therethrough. A valve 5, biased to an open position, is arranged to close the flow channel intermittently when water flows through the flow channel in use. A variable volume chamber 12 communicating with the flow channel is provided downstream of the valve for enhancing operation of the valve in use.</p> |
