Benefits

Thoroughly read and understand this entire manual before installation and operation of pump.

Zenith® Pumps In 1926, Zenith Pumps was approached by the synthetic fiber industry to design a

pump to provide a precise, pulseless, and repeatable flow and assure better quality control.

Since then, Zenith has provided pumps for virtually every polymer utilized in the plastics extrusion industry. Over the years, Zenith has continually developed and improved its pump designs to meet the stringent demands made by new polymers and new processes.

Zenith Pumps' line of PEP-II polymer extrusion pumps has a unique positive displacement design, which provides con- sistent, accurate polymer delivery under varying extruder output conditions of pressure, temperature and viscosity. These virtually pulseless gear pumps are the ideal interface between the extruder and the die of extrusion systems, and pro- vide a homogeneous melt at increased throughputs and tighter gauge tolerances.

For years, polymer processors have utilized gear-pump-assisted extrusion to solve critical issues in the diverse plastics industry.

The Zenith gear pump optimizes the extrusion process by allowing the screw to melt and homogenize the polymer. As the pump generates the needed pressure, it relieves the extruder of work; therefore, reducing heat from the shear, lowering the torque required, and eliminating surging. All this optimizes the performance of the extruder and offers the following benefits:

•Improved Dimensional Stability— Effectively isolates the die from upstream fluctuations.

•Controlled Melt Quality—Regulates the extruder back pressure while it reduces residence time, stabilizes the plasticating action, and lowers melt temperature.

•Increased Production—Provides very high efficiency regardless of its pres- sure building requirement.

•Reduced Raw Material Usage— Provides a narrower finished product gauge variation.

•Eliminates Surging and Screw Beat— Effectively handles problems caused by melt density or extruder parameters.

•Increased Extruder Flexibility— Allows varying process conditions such as higher regrind levels, tempera- tures, pressures, etc.

•Crowned Root Gear Design— Reduces shear internal to the pump, lowering the temperature and increasing the production rate per power required.

•Streamlined Operation and Start-up— Closed-loop controls provide easy operator interface.

•Extended Extruder Life—Reduces work required by the extruder such as pressure and torque.

•Lower Operational Costs—Provides a more efficient method of conveying, eliminating material giveaway, and increasing production per pound of extrudate, etc.

Specifications Capacities: 0.16 to 750 cc/rev.

Operating Speed: 10 - 90 rpm on most extrusion processes depending upon process parameters

Differential Pressure: Up to 5,000 psi (345 bar)

Body Pressure: 10,000 psi (690 bar).

Temperature: To 645° F (340° C),

(950° F maximum with special fasteners and seals).