A new kind of jetting valve driven by the piezo-stack using its quick response and good output properties was presented.The jetting valve was comprised of piezo-stack,flexible lever beam,needle and nozzle.The force of adhesive when jetting was analyzed.Using ANSYS software the adhesive field at the nozzle was analyzed and simulated,getting the jetting regularity affected by the needle displacement,the driving air pressure and adhesive viscosity.Then the property of the jetting valve was tested in experiment,which verified the theoretical analysis and the simulation in ANSYS software.When the adhesive viscosity is 2 Pa·s,droplets of minimum diameter 0.5 mm could be obtained from the jetting valve and conformity error is about 6%.The jetting valve provides more efficient and precise method for the electronic packaging.
