| 摘要 |
A system for dispensing a flowable substance includes a closed source member (1, 10) for holding the substance. A passageway (2, 2A) connects the source member with a dispensing chamber (14) with a first one-way valve (3) located within the passageway to prevent backflow into the source member. The dispensing chamber is arranged to dispense selected amounts of the flowable material through a dispensing head (6). The dispensing head contains a second one-way valve (5) connected to the dispensing chamber with passageways (8) extending from the second one-way valve to outlet openings (7) from the dispensing head. Alternatively, a passageway (112) can connect the source member directly with the second one-way valve (115) and the dispensing head (116). A peristaltic device (120A, 120B) acts on the passageway pressing the flowable substance out through the second one-way valve and the dispensing head. |
