| 摘要 |
<p>This invention relates to a submerged surface cleaner (10). The cleaner (10) includes a housing (12) defining an inlet (14), an intake chamber (16) in fluid communication with the inlet, and an outlet (18) which is connectable to a suction source. Within the housing (12) a valve (20) is provided for interrupting liquid flow through the housing. The valve (20) includes a valve seat (22), a valve closure (44) and a valve control chamber (60). The valve closure (44) is movable relative to the valve seat (22) between an open condition of the valve in which the valve closure (44) is spaced from the valve seat (22) and liquid is allowed to flow from the intake chamber (16) to the outlet (18), and a closed condition of the valve in which the valve closure (44) engages the valve seat (22) so as to prevent liquid flow from the intake chamber (16) to the outlet (18). The valve control chamber (60) communicates with the outlet (18) and is partially defined by a bellows (28) which is movable under liquid pressure changes, in use, so as to allow the valve (20) to open and close, thereby to impart motion to the cleaner (10).</p> |
