Pressure-regulating valve and liquid droplet ejection apparatus having the same

A pressure-regulating valve comprising:

• a communication flow passage formed through a barrier that partitions a primary chamber and a secondary chamber inside a valve housing;
• a valve body that opens and closes the communication flow passage, an edge of a primary-chamber-side opening of the barrier in which the communication flow passage is formed being a valve seat;
• and
• a pressure-receiving membrane that forms one surface of the secondary chamber, and opens and closes the valve body based on atmospheric pressure,
• the pressure of a functional liquid fed to the primary chamber from functional liquid feeding means being regulated by opening and closing the valve body, the functional liquid is fed to the secondary chamber, and the functional liquid is fed from the secondary chamber to an inkjet-type functional droplet ejection head, wherein
• the valve body has a valve body main body that directly opens and closes with respect to the valve seat, the valve body main body being provided to the primary chamber, and a valve holder including a holding part that holds the valve body main body and an actuating shaft that comes in contact with the pressure-receiving membrane, the actuating shaft extending concentrically through the communication flow passage from the holding part,
• the actuating shaft is formed so as to taper to a point toward the pressure-receiving membrane, and
• the communication flow passage is formed to have a complementary shape with respect to the actuating shaft such that the functional liquid flows between the actuating shaft and the communication flow passage toward a distal end of the actuating shaft from the primary chamber to the secondary chamber while the valve body main body is separated from the valve seat.