Zenith Pumps PEP-II Series Gear Pumps ® Installation, Care and Maintenance Zenith Polymer Extrusion Gear Pumps
Thoroughly read and understand this entire manual before installation and operation of pump. Zenith Pumps was approached Zenith Pumps Inby1926, 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.
Zenith Pumps and The Extrusion Process ® ELECTRIC HEAT PLATE ZENITH ADDITIVE INJECTION SYSTEM ZENITH PEP-II PUMP EXTRUDER CHANGER P T INLET PRESSURE PUMP TEMPERATURE P DISCHARGE PRESSURE Zenith Pumps can handle all your extrusion pumping applications including additive injection for on-line compounding of tackifiers, colorants, stabilizers, etc. Design The PEP-II pump is constructed of two gears rotating in mesh within a closely fitted housing that is comprised of three plates.
PEP-II Pump 0.16-3 cc/rev Dimensional Diagram Diagram 1 Dimensional Data Chart PUMP CAPACITY A B C D 0.16 0.3 0.6 1.2 1.8 3.0 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 2.860 2.860 2.860 3.650 3.650 3.650 1.400 1.400 1.400 1.400 1.400 1.400 CC/REV PUMP DIMENSIONS E F G 2.400 2.400 2.400 2.400 2.400 2.400 1.960 1.960 1.960 1.960 1.960 1.960 0.750 0.750 0.750 0.750 0.750 0.750 H I J MAX TORQUE APPROX WEIGHT 1/4 1/4 1/4 5/16 5/16 5/16 1.500 1.500 1.500 2.
Dimensional Diagram PEP-II Pump 5-750 cc/rev Diagram 3 Dimensional Data Chart PUMP CAPACITY 5 10 20 40 100 175 300 750 CC/REV A 3.250 4.000 4.750 5.750 8.000 9.500 11.250 14.750 B 3.250 4.000 5.000 6.000 8.250 9.750 12.000 15.750 C 3.250 4.000 5.000 6.250 8.250 9.880 12.500 16.500 D 1.125 1.188 1.188 1.188 1.750 1.813 2.375 3.000 PUMP DIMENSIONS E F G 2.875 3.375 3.750 4.438 5.438 6.375 8.063 10.000 2.125 2.615 3.300 4.000 5.458 6.475 8.000 10.542 0.500 0.625 0.750 1.000 1.250 1.500 2.000 2.
Operation Polymer enters the PEP-II pump on the suction side where shaft rotation exposes gear tooth volumes between the gear teeth. Polymer fills these spaces and is transported to the discharge side where the gear teeth mesh together, decreasing the gear tooth volumes and displacing the polymer. Due to the precision tolerances and close clearances within the rotating spaces, very high pressures can be achieved at the pump discharge with extremely high volumetric efficiencies.
Cleaning, Inspection, Repair and Service After removal from the system, the assembled pump can be cleaned by placing it in a suitable furnace (i.e. vacuum oven, fluidized bed, etc.) and slowly increasing the temperature to 800-850° F in no less than two hours. Special care should be taken to avoid flashing of the polymer. Control of temperature is essential as it is possible to draw back the hardness of the steel and affect dimensional stability if the pump is overheated.
Disassembly continued D-Bearing Orientation Schematic 8 plate and set aside in a safe place to prevent damage. At this point, make certain to note the orientation of the groove on the rear of each bearing with respect to the inlet port. They MUST be reassembled in the same way as disassembled; that is, they must point toward the inlet port, or severe pump damage may result when the pump is started.
Reassembly These instructions should be thoroughly read and understood before starting reassembly. General instructions that should be observed to ensure correct reassembly of the pump are as follows: • Using a solvent such as trichloroethane or chloroethene Nu, clean all parts that are to be used in the reassembled pump. WARNING: Use extreme care when using any solvent. Prolonged contact with the liquid or inhalation of the vapor can cause serious health problems.
Reassembly continued Bolt Torque ring on the shaft with the ID tapering toward the pump. On the drive shaft ends, fit the bullnose on the end of the shaft. Work the seal gently over the end of the bullnose and down the shaft, as any damage could cause polymer leakage after start-up. Ease the seal into the wide end of the installation ring and, using the pressing tool, gently press the lip seal into the Rheoseal housing.
Parts Replacement When ordering replacement parts, please be sure to include the following information: 1) Pump model number 2) Part number (12-digit) and description 3) Quantity 4) Shipping instructions Order parts from your local Zenith representative or direct from Zenith. Troubleshooting Trouble Probable Cause Remedy Pump will not turn 1) Low pump temperature Check thermocouple and control loop for proper setting/operation. Allow sufficient heat-up time.
FAILURE, IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE. WARNING This document and other information from Zenith Pumps, its subsidiaries and authorized distributors provide product and/or system options for further investigation by users having technical expertise.