The needle valve design applies low viscosity assembly fluids with accurate, extremely close repeat deposit control. During operation, controlled pulsed air acts on the piston to withdraw the needle a preset distance from the needle seat to provide exact, repeatable fluid flow. The stainless steel needle seats in the tip adapter, virtually eliminating dead fluid volume between shots. Adjustable fluid flow control. Unaffected by entrapped air in fluid. Low-maintenance design. Zero dead fluid volume. Positive shutoff.