Liquid material discharge device, and application device and application method therefor

A liquid material discharge device used in a negative pressure space, the liquid material discharge device comprising:

• a storage container storing a liquid material;
• a compressed-gas supply source pressurizing the storage container;
• a nozzle having a discharge flow path;
• a reciprocating valve rod;
• an actuator driving the valve rod;
• a valve seat having a communication hole that is communicated with the discharge flow path;
• and
• a discharge control device controlling the actuator to open and close the communication hole by a lower end of the valve rod,
• wherein the liquid material discharge device further comprises a resin film disposed and fixed in a replaceable manner at the lower end of the valve rod or a resin film disposed and fixed in a replaceable manner on an upper surface of the valve seat, the latter resin film having a through-hole that is communicated with the communication hole,
• the valve seat is constituted in a replaceable manner by a valve seat member having a planar upper surface and being fixed to the nozzle in a replaceable manner.