DOUBLE-MEMBRANE FORCE FEED DEVICE

PURPOSE:To reduce the damage of facilities when a membrane is broken by providing a pair of flexible elastic membranes at the end sections or inside a pressure container, and partitioning the container into a driving fluid chamber, an intermediate liquid chamber, and a forced feed fluid chamber. CONSTITUTION:A pressure container 2 is constituted of an outer tube 6 and flanges 9, 9', flexible elastic membranes 7, 7' having the same shape are arranged face to face on the flanges 9, 9', and the outer tube 6 is partitioned into a driving fluid chamber 13, an intermediate liquid chamber 15, and a forced feed fluid chamber 14. A driving fluid 12 is fed to or discharged from the driving fluid chamber 13. The intermediate chamber 15 is filled with a liquid having a well-known feature such as water. A general-purpose detector can be used for detection when a membrane is broken. An intake valve 10 and a delivery valve 11 are connected to the forced feed fluid chamber 14. The driving fluid 12 is fed to or discharged from the driving fluid chamber 13, and the flexible elastic membranes 7, 7' are expanded or shrunk to drive the intake valve 10 and the delivery valve 11.