An apparatus for dispensing an adhesive generally comprises a dispensing module, a liquid supply component, and an actuating assembly. The actuating assembly includes a housing proximate the dispensing module and a three-way solenoid valve operatively coupled to the housing. A piston positioned within a piston chamber of the housing is configured to reciprocate along a piston axis when operated by pressurized air controlled by the solenoid valve. The piston is operatively coupled to a valve element within the dispensing module by a pivot arm.