| 摘要 |
<p>A portable sprayer (11) for spraying liquid chemicals such as pesticides, fungicides, and fertilizers having a large storage tank (13) in which is mounted a pressure vessel. A manually actuated pumping assembly is connected with the bottom portion of the pressure vessel (35) and also with the bottom portion of the tank (13). The pumping assembly comprises a reciprocating piston (51) to draw liquid from the storage tank (13) and pressurizes it within the pressure vessel. The operator may discharge the pressurized liquid using a hose (127) and a control valve (129) affixed to the pressure vessel. The pumping assembly further comprises a double-walled piston and a leak barrier to collect any liquid that may leak from the piston. The reciprocating action of the piston is utilized to return the leaked liquid to the storage tank (13) via a return siphon.</p> |
