| 摘要 |
<p>The device has a liquid product pumping chamber (21) for pumping a liquid product and provided in communication with a liquid product tank. A hydraulic pressure chamber (22) is connected to a water supply conduit (42). A pump body (20) includes a piston (23) mounted in translation between the pressure chamber and the pumping chamber. The pressure chamber is communicated with an exhaust opening (47) when the supply of water is turned off. The exhaust opening is connected to a return opening (66) opened in an evacuation chamber (60) by communicating with the pumping chamber.</p> |
