PRESSURE FEEDING DEVICE

PURPOSE:To eliminate limitation to membrane displacement ratio by consideration of a membrane life and make the whole body of a pressure feeding device compact and light by forming the sectional surface of an expansion body like bellows. CONSTITUTION:By letting drive fluid in from a drive fluid guide port 6 provided at an end part surface plate 5, an expansion body 2 like bellows is expanded. At this time, a discharge valve 8 is kept open, and a suction valve 7 closed, so a feed pressure is loaded on fluid in a pressure feed fluid chamber 10 to be in a discharging condition. By letting the drive fluid out from the drive fluid guide port 6, the expansion body 2 of bellows us contracted. At this time, the discharge valve 8 is kept closed, and the suction valve 7 opened, so new pressure feed fluid is sucked into a container 1.