| 摘要 |
<p>A pumped shower drain system (10 Fig. 2) comprises a shower base (12), a waste water unit (14) provided on the shower base and having a waste water inlet (28), a waste water outlet (30) and a reciprocating, e.g. diaphragm, water pump 20 for pumping to drain. The pump includes: a housing 40 having an inlet 48 in communication with the waste water unit outlet, and a pump outlet 50 in communication with the drain; first and second inlet valves 56, 58 in spaced relationship; and first and second outlet valves 84, 86 in spaced relationship. Each set of inlet and outlet valve seals comprise different kinds of valves from each other with different modes of operation e.g. multi-cuspid 58 and flap 56 valves and are independently closable to close the pump inlet or outlet. Makes pump failure due to valve blockage less likely.</p> |
