Replenishing system for process fluids

摘要

The process fluid is drawn from a supply tank (2) and recirculated to the tank to maintain the mixture. A valve (8) controlled by a processor control (11) taps off metered amounts of fluid to the processing tank (1). The pressure buffer tank (13) is connected between the pump (6) and the valve. The buffer has a membrane and a gas cushion. Alternately it has a narrow return flow outlet to build up the pressure. The pump is a self priming type.