Cat Pump 2SF15SEEL Direct Drive Plunger Pump
The Cat Pump 2SF15SEEL is a compact triplex plunger pump built for jobs where a small footprint and steady high pressure matter more than raw volume. It moves 1.5 GPM at pressures up to 1200 PSI while turning at 1725 RPM, and because the shaft is hollow, the pump slides directly onto a 56C face electric motor. There is no belt, no pulley, and no separate base plate to align, which is what makes this pump a favorite when the available space is a cabinet, a skid corner, or a wall-mounted panel rather than an open equipment room.
What sets the 2SF15SEEL apart from a general-purpose pump is the wetted path. The manifold and valve assemblies are 316 stainless steel, and the plungers are solid ceramic with a flow-through design that keeps liquid moving smoothly across the sealing surface. Spring-loaded inlet valves open and close predictably at low flow, so the discharge stays even instead of surging, which protects downstream membranes, nozzles, and instrumentation. Standard NBR seals cover most water and mild-solution duty, and FPM, EPDM, FFKM, and high-temperature options are available when the liquid is more aggressive or runs warmer than typical.
In practice, this pump ends up in reverse osmosis and water treatment skids, high-pressure misting and humidification systems, dust suppression lines, chemical injection packages, spray and coating equipment, hydrostatic test rigs, and light-duty washdown carts. It handles seawater and other corrosive liquids well thanks to the stainless construction, but the 2SF15SEEL is just as much at home in a greenhouse, a food plant, a print shop, or an agricultural sprayer as it is anywhere near saltwater. Rebuild kits and individual valve, seal, and plunger components are available, so a pump that has logged years of service can be brought back to spec rather than replaced.
Key Features
- Triplex positive displacement plunger design for smooth, low-pulsation flow
- Hollow shaft direct drive mounts straight to a 56C face electric motor for the smallest possible footprint
- 316 stainless steel manifold and valve assemblies for corrosion resistance
- Solid ceramic flow-through plungers for long wear life and consistent sealing
- Spring-loaded inlet valves that hold steady flow at low volumes
- Standard NBR seals with FPM, EPDM, FFKM, and high-temperature alternatives available
- Oil-lubricated crankcase with ball bearings for continuous duty operation
- Fully rebuildable with available valve, seal, and plunger service kits
- No belts, pulleys, or separate base plate required
Applications
- Reverse osmosis, desalination, and water treatment boosting
- High-pressure misting, fogging, and humidification systems
- Dust suppression and odor control
- Chemical injection, metering, and transfer
- Agricultural and horticultural spraying, greenhouse and livestock misting
- Food processing sanitation and washdown
- Hydrostatic and pressure testing
- Industrial parts cleaning, surface prep, and equipment washing
- Spray, coating, and atomizing equipment
- Car wash, vehicle, and fleet cleaning systems
- Marine and seawater service where corrosion resistance is required
Specifications
- Model: 2SF15SEEL
- Pump Type: Triplex positive displacement plunger pump
- Drive Type: Direct drive, hollow shaft
- Flow Rate: 1.5 GPM (5.7 LPM)
- Pressure Range: 100 to 1200 PSI (6.9 to 83 bar)
- Speed: 1725 RPM
- Inlet Port Size: 3/8" NPT(F)
- Discharge Port Size: (2) 3/8" NPT(F)
- Bypass Return Port Size: 1/4" NPT(F)
- Inlet Pressure: Flooded to 60 PSI (4.1 bar)
- Shaft: 5/8" (15.9 mm) hollow shaft
- Motor Mounting: 56C face flange
- Stroke: 0.177" (4.5 mm)
- Manifold Material: 316 stainless steel
- Valve Material: 316 stainless steel, spring-loaded inlet valves
- Plunger Material: Solid ceramic, flow-through design
- Seals and O-Rings: NBR standard; FPM, EPDM, FFKM and HT optional
- Maximum Liquid Temperature: 160°F (71°C) with NBR seals; up to 180°F (82°C) with alternate seals
- Crankcase Capacity: 10.1 oz (0.30 L)
- Recommended Oil: ISO-68 hydraulic oil
- Pump Weight: 8.9 lbs (4 kg)
- Dimensions: 6.8" x 8.7" x 5.2" (173 x 221 x 133 mm)
Frequently Asked Questions
Q: Does the 2SF15SEEL require a separate mounting base or coupling?
A: No. The hollow shaft slides directly onto the shaft of a 56C face electric motor and bolts to the motor flange, so no coupling, base plate, or belt guard is needed. Apply antiseize lubricant to the motor shaft before assembly to make future removal easier.
Q: Can this pump be run dry or started against a closed discharge?
A: No. It needs a flooded or lightly pressurized inlet and a properly sized relief or regulating valve on the discharge. Running dry damages the seals and plungers quickly, and deadheading the pump builds pressure beyond the rated range.
Q: What size electric motor should be paired with it?
A: Motor sizing depends on the operating pressure rather than the maximum rating. At full 1.5 GPM and 1200 PSI the pump typically calls for roughly a 1.5 HP, 1725 RPM, 56C face motor; lighter pressures allow a smaller motor.
Q: Can the flow or pressure be adjusted?
A: Flow is fixed by the pump speed and displacement, so at 1725 RPM the output stays at 1.5 GPM. Pressure is set downstream with a regulating or unloader valve, and any liquid not used is returned through the bypass port.
Q: How often should the crankcase oil be changed?
A: Change the ISO-68 oil after the first 50 hours of break-in, then on a regular interval based on duty, typically every 500 hours or every three months for continuous service. Check the oil level and color at each inspection.
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