Patent ID: 8480012

Claim:
A system for failsafe controlled dispensing of a liquid material from a source compartment comprising: a housing having an inlet, an outlet, and an intermediate portion extending therebetween, said intermediate portion having formed therein an admission port for admission of the liquid material therethrough; a control valve disposed in said intermediate portion for directing a pressurized fluid stream entering said inlet separate from the liquid material, said control valve being selectively disposed between at least open and closed configurations; and, a response valve disposed in a flow path defined to remain outside the source compartment between said control valve and said outlet, said response valve being actuable between active and inactive configurations responsive to said control valve direction of said pressurized fluid stream, said response valve being maintained in said active configuration by delivery of said pressurized fluid stream to said open control valve; wherein admission of the liquid material from the source compartment into said housing is enabled by said response valve being in said active configuration; the system maintaining the pressurized fluid stream within the flow path.