1861-1861K

Summary

Product identification

This document describes the CAT Pumps 18 Frame Block-Style Stainless Steel Plunger Pump, available in two models:

• 1861: Standard Model
• 1861K: Flushed Model

Key Features:

• Triplex plunger design delivers high efficiency and low pulsation.
• Durable dual V-Packings are lubricated and cooled by pumped liquid (Standard Model) or external flush (Flushed Model).
• Pre-set Lo-Pressure Seals provide secondary protection against external leaks and require no packing adjustment.
• Special high-density, polished, concentric plungers provide a true wear surface and extended seal life.
• Specially formulated Seals and V-Packings offer unmatched performance and extended life.
• Wet-end easily serviced without entering the crankcase.
• Manifolds are 316 SS block-style for long-term continuous duty and corrosion resistance.
• Stainless steel valves, seats, and springs provide corrosion resistance, ultimate seating, and extended life.

Operating limits

• Flow (Model 1861): 10.0 gpm (38 l/m)
• Pressure Range: 100 to 3000 psi (7 to 210 bar)
• Inlet Pressure Range: +10 to 0 psi (0.70 to 4 bar)
• RPM (Model 1861): 1429 rpm
• Maximum Liquid Temperature: 160°F (71°C)
  • Note: For temperatures above 130°F, consult CAT PUMPS for inlet conditions and elastomer recommendations.
• Crankcase Capacity: 42 oz. (1.2 l)

Feed water

• Standard Models (1861): Lo-Pressure Seals and V-Packings are completely lubricated and cooled by the liquid being pumped.
• Flushed Models (1861K): Feature a special ported inlet manifold that permits an external flush liquid. This provides cooling for high-temperature liquids and lubrication for low lubricity liquids, such as DI water.

Electrical

Electric Horsepower Requirements (using 1725 RPM Motor & Std. 10.0" Pump Pulley):

• Model 1861 (10.0 gpm / 38 l/m @ 1429 rpm, 8.1" Pulley O.D.):
  • 1500 psi (105 bar): 10.3 HP
  • 1800 psi (125 bar): 12.4 HP
  • 2000 psi (140 bar): 13.7 HP
  • 2200 psi (155 bar): 15.1 HP
  • 2500 psi (175 bar): 17.2 HP
  • 3000 psi (210 bar): 20.5 HP
• Model 1861K (9.0 gpm / 34 l/m @ 1285 rpm, 7.3" Pulley O.D.):
  • 1500 psi (105 bar): 9.3 HP
  • 1800 psi (125 bar): 11.1 HP
  • 2000 psi (140 bar): 12.4 HP
  • 2200 psi (155 bar): 13.8 HP
  • 2500 psi (175 bar): 15.4 HP
  • 3000 psi (210 bar): 18.5 HP

Flushing Assembly (Optional for 1861K):

• 5 gal, 115V, 1.1 Amp, 1/2" NPT

Formulas for Pump Sizing:

• Determining Pump R.P.M.: Rated gpm / Rated rpm = "Desired" gpm / "Desired" rpm
• Determining Required H.P.: gpm x psi / 1440 = Electric Brake H.P. Required
• Determining Motor Pulley Size: Motor Pulley O.D. / Pump rpm = Pump Pulley O.D. / Motor rpm

Mechanical / hydraulic

• Bore: 0.787" (20 mm)
• Stroke: 1.181" (30 mm)
• Inlet Ports (2): 1" NPTF
• Flushing Ports (2): 1/4" NPTF (for K Models)
• Discharge Ports (2): 1/2" NPTF
• Pulley Mounting: Either Side
• Shaft Diameter: 1.181" (30 mm)
• Weight: 7 lbs. (30.4 kg)
• Dimensions (L x W x H): 18.37 x 12.99 x .49" (467 x 330 x 15 mm)

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

Official datasheet (PDF)

Lenntech datasheet mirror