Abstract: A master/slave pump assembly employs a dual diaphragm pump as the master pump. An abrasive fluid, such as a resin containing abrasive particles, can be pumped by the dual diaphragm pump without the damage that would result from exposure of seals to the abrasive fluid. The slave pump, which can pump a catalyst or other secondary fluid, is driven in response to movement of the diaphragms and the shaft connecting the two diaphragms. A force or a signal dependent upon the actual mass flow rate of the primary fluid, can be communicated hydraulically or electrically to the slave pump, regardless of viscosity or environmental factors. An adjustable linkage is employed to alter the ratio of the mass flow rates of the two fluids.

Abstract: A dual rotor, ram fed metering pump is especially suited for pumping high viscosity fluids, such as methacrylate resins, used in heavy duty adhesives In addition to pumping viscous materials, this metering pump also pumps a less viscous reactive fluid in proper proportion to a mixing zone or mixing gun where the two material are mixed. A rotary lobe pump is used to pump the viscous material and a rotary pump driven by the same gearbox delivers the secondary fluid. This fluid delivery apparatus also includes an intake that can be mounted on a standard pressure primmer ram to pump viscous material from a storage drum or container A single compact all-in-one metering pump package can be mounted directly to the ram eliminating the need for a separate ram mounted pump.