| 摘要 |
A metered output hot melt adhesive dispensing sys- tem comprises a plurality of hot melt adhesive dispensing valve assemblies, and a multiple outlet metering gear pump for supplying hot melt adhesive material to the plurality of valve assemblies. Return ports of the valve assemblies are fluidically connected to the intake side of the multiple outlet metering gear pump through a plurality of return con- duits and a common return line. A single output return met- ering gear pump is .disposed within the common return line and has operatively associated therewith a recirculation by- pass loop within which a spring-biased one-way check valve is disposed. The system relieves excess pressure buildup within the valve assemblies so as to substantially prevent the occurrence of bursting and stringing phenomena attendant cyclically intermittent OPENED and CLOSED states of the plu- rality of valve assemblies.
|
