333

Summary

Product Identification

This document describes 4 Frame Piston Pumps, including models:

• 333, 430: Standard Brass Models
• 331, 431: Stainless Steel Models
• 335, 435: Pulse Pump Models

Features

• Triplex Uniflow design provides a smooth, low-pulsation flow with strong suction capabilities.
• Hard chrome-plated 304S cylinders and sleeves provide long life.
• Optional 316 Stainless Steel manifolds for added strength and corrosion resistance.
• Optional FPM and PTFE elastomers for liquid compatibility.
• Patented stepped piston rod with hard chrome-plated stainless steel sleeve provides a durable wear surface and easy wet-end servicing.
• 100% wet cup/seal design adds to service life by allowing pumped liquids to cool and lubricate the elastomers on both sides.
• 304 stainless steel valves, seats, and springs provide corrosion resistance, ultimate seating, and extended life.
• Mechanically actuated inlet valves provide strong lift and easy prime.

Operating Limits

• Maximum Liquid Temperature: 160°F (71°C)
  • Note: Above 130°F, call CAT PUMPS for inlet conditions and elastomer recommendations.
• Inlet Pressure Range: –8.5 to +40 psi (–0.6 to +2.8 bar)
• Liquid pH Range: 5-9 pH (for 304S cylinders and sleeves)

Mechanical / Hydraulic

Model-Specific Specifications:

• Models 333, 331, 335
  • Flow: 4.0 gpm (15 lpm)
  • Pressure Range: 100 to 1200 psi (7 to 85 bar)
  • RPM: 1070 rpm
  • Bore: 0.709” (18 mm)
• Models 430, 431, 435
  • Flow: 5.0 gpm (19 lpm)
  • Pressure Range: 100 to 1000 psi (7 to 70 bar)
  • RPM: 1040 rpm
  • Bore: 0.787” (20 mm)

Common Specifications:

• Stroke: 0.768” (19.5 mm)
• Crankcase Capacity: 21 oz. (0.6 l)
• Inlet Ports (1): 1/2” NPTF
• Auxiliary Port (1): 1/4” NPTF
• Discharge Ports (2): 3/8” NPTF
• Discharge Port (1): 1/2” NPTF
• Pulley Mounting: Either Side
• Shaft Diameter: 0.650” (16.5 mm)
• Weight: 17.7 lbs. (8.0 kg)
• Dimensions: 12.56 x 8.80 x 5.33” (319 x 223 x 135.5 mm)

Electrical

Electric Horsepower Requirements (Using 1725 rpm Motor & Std. 8” Pump Pulley O.D.):

• Models 333, 331, 335 (4.0 gpm / 15 lpm)
  • 800 psi (55 bar): 2.2 HP
  • 1000 psi (70 bar): 2.7 HP
  • 1200 psi (85 bar): 3.3 HP
  • Pump RPM: 1070 rpm, Motor Pulley O.D.: 5.0
• Models 333, 331, 335 (3.0 gpm / 11.4 lpm)
  • 800 psi (55 bar): 1.6 HP
  • 1000 psi (70 bar): 2.1 HP
  • 1200 psi (85 bar): 2.5 HP
  • Pump RPM: 803 rpm, Motor Pulley O.D.: 3.8
• Models 333, 331, 335 (2.0 gpm / 7.6 lpm)
  • 800 psi (55 bar): 1.1 HP
  • 1000 psi (70 bar): 1.4 HP
  • 1200 psi (85 bar): 1.6 HP
  • Pump RPM: 535 rpm, Motor Pulley O.D.: 2.5
• Models 430, 431, 435 (5.0 gpm / 19 lpm)
  • 800 psi (55 bar): 2.7 HP
  • 1000 psi (70 bar): 3.4 HP
  • 1200 psi (85 bar): N/A
  • Pump RPM: 1040 rpm, Motor Pulley O.D.: 5.1
• Models 430, 431, 435 (4.0 gpm / 15 lpm)
  • 800 psi (55 bar): 2.2 HP
  • 1000 psi (70 bar): 2.7 HP
  • 1200 psi (85 bar): N/A
  • Pump RPM: 832 rpm, Motor Pulley O.D.: 4.1
• Models 430, 431, 435 (3.0 gpm / 11.4 lpm)
  • 800 psi (55 bar): 1.6 HP
  • 1000 psi (70 bar): 2.1 HP
  • 1200 psi (85 bar): N/A
  • Pump RPM: 624 rpm, Motor Pulley O.D.: 3.1

Materials of Construction

Key materials mentioned:

• Cylinders and Sleeves: Hard chrome-plated 304S
• Manifolds: High tensile strength chrome-plated brass or 316 Stainless Steel (optional)
• Valves, Seats, and Springs: 304 stainless steel
• Elastomers: NBR (Nitrile), FPM (Fluorocarbon), PTFE (Polytetrafluoroethylene) (optional)
• Crankshaft: Forged Chrome-moly (FCM)
• Connecting Rod: Special High Strength (TNM)

A detailed parts list with material codes (e.g., AL=Aluminum, BB=Brass, S=304SS, SS=316SS) is available in the full PDF.

Installation Notes

All High Pressure Systems require a primary pressure regulating device (e.g., regulator, unloader) and a secondary pressure relief device (e.g., pop-off valve, relief valve). Failure to install such relief devices could result in personal injury or damage to the pump or property.

Disclaimer

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

Official datasheet (PDF)

Lenntech datasheet mirror