Metered output hot melt adhesive dispensing system with return isolation loop

A hot melt adhesive material dispensing system, comprising:

• a plurality of valve assemblies for dispensing a hot melt adhesive material from each one of said plurality of valve assemblies when a particular one of said plurality of valve assemblies is disposed in an OPENED state;
• a multiple outlet metering gear pump for supplying a predetermined amount of hot melt adhesive material from a hot melt adhesive material supply source to each one of said plurality of valve assemblies;
• a plurality of hot melt adhesive material supply conduits respectively fluidically interconnecting each outlet of said multiple outlet metering gear pump to said plurality of valve assemblies so as to supply said plurality of valve assemblies with hot melt adhesive material to be dispensed;
• a plurality of return conduits respectively fluidically interconnecting said plurality of valve assemblies, through means of a common return line, to an intake side of said multiple outlet metering gear pump so as to return hot melt adhesive material to said intake side of said multiple outlet metering gear pump when a particular one of said plurality of valve assemblies is disposed in a CLOSED state;
• and
• a single output return metering gear pump disposed within said common return line for developing negative pressure conditions within said common return line and said plurality of return conduits fluidically connected to said plurality of valve assemblies so as to prevent pressure buildup conditions within any one of said plurality of valve assemblies in order to substantially prevent the occurrence of bursting and stringing phenomena attendant cyclically intermittent OPENED and CLOSED states of said plurality of valve assemblies.