Gorman Rupp # 16200-077 Mini Bellows Pump

The Gorman Rupp Industries (GRI) model # 16200-077 is a Mini Bellows Pump and Motor unit, with a 1/2 inch Bellows, coupled to a 24 RPM, 115 Volt AC Motor. The pump is constructed entirely of plastic and uses GRI's time-proven bellows technology to provide an accurate chemically-resistant metering pump with a long life, at an economical price. The Mini Bellows Metering Pumps operate on a positive displacement principle. The rotation of the motor shaft is transmitted into an up and down linear motion through an adjustable concentric crank mechanism. This motion provides a continuous compressing and relaxing force on the bellows module, forcing fluid between two check valves located in the module's valve body. Up to two separate bellows modules can be operated by single motor for proportioning up to four separate fluid mediums. The flow rate of each module is independently adjustable. Multiple bellows modules operate out-of-phase with each other for most efficient power usage. Optimum operating conditions consist of a 6 inch minimum suction life and a discharge head of not less than 6 inches. Pumps must be mounted vertically with the valve body at the top to obtain maximum metering accuracy. For conditions where a positive suction head condition exists, an anti-siphon spring or anti-siphon spring kit can be added to aid the poppet valve seal properly during operation. Maximum fluid viscosity is 5,000 centistokes. Poppet valves can handle fine slurries. Duckbill valves are recommended for heavy slurries or fibrous materials. Heavy slurries should be flushed from the pump before shutdown.