Jetting devices

A jetting device for jetting droplets of fluid material onto a substrate supporting electronic components, the jetting device comprising:

• a fluid module configured to be coupled with a fluid supply and to jet the fluid material, the fluid module including a valve seat, a moveable element having an upper surface and a contact surface, a valve element carried by the moveable element and configured to move relative to the valve seat over a stroke length, and a valve stop configured to adjustably define the stroke length, and
• a drive module configured to actuate the fluid module and including a drive pin configured to, upon movement of the drive pin towards the valve seat to engage the upper surface of the moveable element, move the valve element into contact with the valve seat to jet a droplet of the fluid material from the jetting device onto the substrate, the drive pin configured to be rotated to cause rotation of the valve stop for adjustment of the stroke length,
• wherein the contact surface is configured to engage the valve stop, and the stroke length is defined between a position where the valve element contacts the valve seat and a position where the contact surface contacts the valve stop.