311-341-351-311C-317-347-357

Summary

Product identification

This document provides specifications for CAT Pumps 5 Frame Plunger Pumps, including models 311, 311C, 317, 341, 347, 351, and 357.

• Materials of Construction:
  • Stainless Steel Models: 311, 341, 351
  • Stainless Steel Flushed Model: 311C
  • Nickel Aluminum Bronze Models: 317, 347, 357

Operating limits

Model 311, 311C, 317 (Standard Specifications)

• Flow: 4.0 gpm (15 l/m)
• Pressure Range: 100 to 2200 psi (7 to 155 bar)
• Pump rpm: 950 rpm
• Inlet Pressure Range: –5 to 60 psi (–0.35 to 4 bar)
• Stroke: 0.709” (18 mm)

Model 311, 311C (Alternate Specifications)

• Flow: 5.0 gpm (19 l/m)
• Pressure Range: 100 to 1500 psi (7 to 105 bar)
• Pump rpm: 1190 rpm

Model 317 (Alternate Specifications)

• Flow: 5.0 gpm (19 l/m)
• Pressure Range: 100 to 2000 psi (7 to 140 bar)
• Pump rpm: 1190 rpm

Model 341, 347 (Direct Drive Specifications)

• Flow: 4.0 gpm (15 l/m)
• Pressure Range: 100 to 1800 psi (7 to 125 bar)
• Pump rpm: 1725 rpm
• Inlet Pressure Range: Flooded to 60 psi (Flooded to 4 bar)
• Stroke: 0.394” (10 mm)

Model 351, 357 (Direct Drive Specifications)

• Flow: 5.0 gpm (19 l/m)
• Pressure Range: 100 to 1500 psi (7 to 105 bar)
• Pump rpm: 1725 rpm
• Inlet Pressure Range: Flooded to 60 psi (Flooded to 4 bar)
• Stroke: 0.472” (12 mm)

Common Specifications

• Bore: 0.787” (20 mm)
• Crankcase Capacity: 18 oz. (0.55 l)
• Maximum Liquid Temperature: 160°F (71°C)
  • Note: Above 130°F, consult CAT PUMPS for inlet conditions and elastomer recommendations.

Electrical

The document includes a table for Electric Horsepower Requirements, detailing HP needed for various models at different flow rates and pressures (1200 psi, 1500 psi, 1800 psi, 2000 psi, 2200 psi), along with pump RPM and recommended motor pulley sizes for a 1725 rpm motor with a standard 8” pump pulley.

See the official PDF for exact tabulated values.

Mechanical / hydraulic

• Ports:
  • Inlet Ports (2): 1/2” NPTF
  • Flushed Ports (2) (311C Only): 1/8” NPTF
  • Discharge Ports (2): 3/8” NPTF
• Shaft Diameter: 0.787” (20 mm)
• Weight: 19.8 lbs. (9 kg)
• Dimensions: 11.81 x 10.0 x 5.24” (300x254 x133 mm)
• Key Features:
  • Triplex design for high efficiency and low pulsation.
  • Durable high-pressure seals are lubricated and cooled by pumped liquid.
  • Pre-set Lo-Pressure Seals offer secondary protection against external leaks without packing adjustment.
  • Optional FPM and EPDM elastomers are available for compatibility with various liquids.
  • Model 311C features a special flushed inlet manifold for external flushing, aiding cooling with high-temperature liquids and lubrication with low-lubricity liquids.
  • Special concentric, high-density, polished, solid ceramic plungers provide a true wear surface and extended seal life.
  • Manifolds are constructed from high tensile strength 316 stainless steel or nickel aluminum bronze for durability.
  • 100% wet seal design enhances service life by allowing pumped liquids to cool and lubricate on both sides.
  • Stainless steel valves, seats, and springs ensure corrosion resistance, optimal seating, and extended life.
  • Specially formulated, Cat Pump exclusive, Hi-Pressure Seals offer unmatched performance and seal life.

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror