| 摘要 |
A valve 35 for use in an ink marking system has an output port 48 and a supply port 46, located below a flexible diaphragm 44 and a control port 38 which communicates with a chamber disposed above the diaphragm. The diaphragm flexes between an open position permitting the supply port to communicate with the output port and a closed position blocking such communication, as a function of the pressure differential across the diaphragm created by pressure changes at the control port. In use in the system, a three-way valve 52 under the control of a detector 30 connects the output port 48 to vacuum source 22, and connects control port 38 either to atmosphere to close the valve 35, or to vacuum source 22 to open the valve so that fluid flows from a supply container 32 connected to the supply port 46 through output port 48 to an ink reservoir 14 for a print head. <IMAGE> |
