| 摘要 |
A chemical delivery system for the direct delivery of a chemical from a drum to a process area comprising a pressurized tank having a pressure/vacuum lock closure, a drum containing a chemical to be dispensed housed within the pressurized tank, and a closed loop electronic feed back system for the controlled dispensing of the chemical from the drum to a process area without the use of a pumping system. The closed loop electronic feed back system monitors and controls the flow of chemical from the drum by regulating the pressure within the pressurized tank. In an alternative embodiment, a closed loop electro-pneumatic fluid control system is provided which controls or modulates a pneumatic output valve disposed between the drum and the process in order to regulate the chemical flow from the drum. In another alternative embodiment, the chemical dispensing system7 utilizes a combination of the closed loop electronic feed back system and the closed loop electro-pneumatic fluid control system for regulating chemical flow from the drum.
|
