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®
Zenith Pumps
PEP-II Series
Gear Pumps
Installation,
Care and
Maintenance
Zenith
Polymer
Extrusion
Gear Pumps
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Thoroughly read and understand this entire manual before installation and operation of pump. ® In 1926, Zenith Pumps was approached Zenith Pumps' line of PEP-II polymer Zenith Pumps by the synthetic fiber industry to design a extrusion pumps has a unique positive pump to provide a precise, pulseless, and displacement design, which provides con- repeatable flow and assure better quality sistent, accurate polymer delivery under control. varying extruder output conditions of Since then, Zenith ha
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® Zenith Pumps and The Extrusion Process ZENITH ELECTRIC PEP-II ZENITH HEAT PLATE PUMP ADDITIVE INJECTION SYSTEM EXTRUDER CHANGER P T P PUMP DISCHARGE INLET TEMPERATURE PRESSURE PRESSURE Zenith Pumps can handle all your extrusion pumping applications including additive injection for on-line compounding of tackifiers, colorants, stabilizers, etc. The PEP-II pump is constructed of two around the shaft, using both dynamic and Design gears rotating in mesh within a closely fit- static types of s
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PEP-II Pump Dimensional Diagram 0.16-3 cc/rev Diagram 1 Dimensional Data Chart PUMP PUMPDIMENSIONS MAXAPPROX CAPACITY A B C D E F G H I J TORQUE WEIGHT 0.16 3.000 3.000 2.860 1.400 2.400 1.960 0.750 1/4 1.500 0.125 80 9 0.3 3.000 3.000 2.860 1.400 2.400 1.960 0.750 1/4 1.500 0.125 80 9 0.6 3.000 3.000 2.860 1.400 2.400 1.960 0.750 1/4 1.500 0.250 195 9 1.2 3.000 3.000 3.650 1.400 2.400 1.960 0.750 5/16 2.500 0.750 410 9 1.8 3.000 3.000 3.650 1.400 2.400 1.960 0.750 5/16 2.500 0.750 410 9 3.0 3.
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PEP-II Pump Dimensional Diagram 5-750 cc/rev Diagram 3 Dimensional Data Chart PUMP PUMP DIMENSIONS MAX APPROX CAPACITYABCD E F G H I JTORQUE WEIGHT 5 3.250 3.250 3.250 1.125 2.875 2.125 0.500 1/4 1.875 0.750 1225 10 10 4.000 4.000 4.000 1.188 3.375 2.615 0.625 5/16 2.344 1.000 2085 18 20 4.750 5.000 5.000 1.188 3.750 3.300 0.750 3/8 2.813 1.250 3250 34 40 5.750 6.000 6.250 1.188 4.438 4.000 1.000 7/16 3.531 1.500 6750 61 100 8.000 8.250 8.250 1.750 5.438 5.458 1.250 5/8 4.688 2.188 12100 150 1
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Polymer enters the PEP-II pump on the fluids such as water or solvent. When Operation suction side where shaft rotation exposes high-viscosity fluids are used, more time gear tooth volumes between the gear is required to fill the tooth volumes. As a teeth. Polymer fills these spaces and is result, the inlet pressure must be transported to the discharge side where increased or the gears must rotate at a the gear teeth mesh together, decreasing slower speed to ensure complete volume the gear tooth
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After removal from the system, the assem- all parts should be carefully inspected for Cleaning, bled pump can be cleaned by placing it nicks, burrs, scoring or other signs of in a suitable furnace (i.e. vacuum oven, wear. The side plates, D-bearings (and Inspection, fluidized bed, etc.) and slowly increasing sides of the gears on the 3.0 cc/rev and the temperature to 800-850° F in no less smaller pumps) can be hand blocked on Repair and than two hours. Special care should be 600 grit paper, and
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plate and set aside in a safe place to pre- 7) Slide the gear shafts and bearings Disassembly vent damage. At this point, make certain out of the center plate. They will not come to note the orientation of the groove on the out separately as the gear teeth will not continued rear of each bearing with respect to the clear the bearings. Take extreme care not inlet port. They MUST be reassembled in to nick or ding the gear teeth or the edges the same way as disassembled; that is, of the bearings. I
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These instructions should be thoroughly configuration. Set the flats on the circum- Reassembly read and understood before starting ference of the bearings against each reassembly. other, and gently slide the bearings and General instructions that should be shafts into the center plate. Slide them far observed to ensure correct reassembly enough through the center plate to allow of the pump are as follows: the drive shaft to protrude out on the front • Using a solvent such as side and allow the f
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ring on the shaft with the ID tapering 14) Slide the seal cover over the shaft Reassembly toward the pump. On the drive shaft ends, until it rests on the protruding lip seal. fit the bullnose on the end of the shaft. Align the screw holes in the cover with continued Work the seal gently over the end of the those in the housing and insert the bullnose and down the shaft, as any dam- screws. Tighten them evenly in a criss- age could cause polymer leakage after cross pattern so that the seal is slo
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When ordering replacement parts, please be sure to include the following information: Parts 1) Pump model number 2) Part number (12-digit) and description Replacement 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 Check thermocouple and control temperature loop for proper setting/operation. Allow sufficient heat-up time. 2) Drive malfunction Verify drive
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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. It is important that you analyze all aspects of your application and review the information concerning the product or system
