Product Description
Armstrong 4270 Stock Motor Mounted Pump, 42ST
Series 4270 | Stock 42ST | Close Coupled Horizontal | 60 Hz
The Armstrong 4270 stock model 42ST is a close-coupled, motor-mounted horizontal pump for building services pumping such as cooling towers, HVAC and general purpose. It is designed for long service life and easy maintenance, with a cast iron casing, an ULTEM resin impeller and a 416 stainless steel shaft.
This is the 60 Hz model. Send us your flow, head, motor and voltage requirements, or the Armstrong model number from your nameplate, and Canadian Pump Shop will confirm the right Stock 42ST for you. The submittal below has the performance curves and dimensions.
Benefits & Features
Extended durability and service life
- High-strength resin impeller minimizes axial thrust, ensuring smooth performance and long life
- Permanently lubricated, heavy-duty motor ball bearings accommodate radial loads and residual hydraulic thrusts
- Self-lubricating mechanical seal prevents liquid seepage
- Aluminum die cast adaptor with integral support foot delivers lightweight and durable construction
Easy and cost-effective servicing
- Radially-split volute can be left in the line while servicing the pump, eliminating needless disconnecting of pipes
- Back pull-out design eliminates the need to break piping connections when servicing the pump
Specifications
| Manufacturer | Armstrong Fluid Technology |
|---|---|
| Series / Model | 4270 / Stock 42ST |
| Frequency | 60 Hz |
| Pump Type | Close-coupled horizontal, motor mounted |
| Applications | Building services: cooling towers, HVAC, general purpose |
| Materials | Cast iron with ULTEM impeller; 416 stainless steel shaft |
| Seal Configuration | Inside single-spring mechanical seal, bronze-fitted |
| Speed (series) | Designed for 3,600 RPM (1,800 RPM optional) |
| Max Temperature (series) | 275°F (135°C) |
| 4270 Series Range | Up to 3,600 USgpm (227 L/s), up to 130 ft (40 m) head, 0.33 to 60 HP |
Design & Submittals
- 4270 Stock Motor Mounted Pump 42ST, 60Hz Submittal (PDF)
- 4270 Stock Motor Mounted Pumps Stock Brochure (PDF)
- 4270 Stock Models Specification (DOC)
- 4270 Motor Mounted Pumps Solution Outline (PDF)
- 4270 Motor Mounted Centrifugal Pumps Typical Specifications (DOC)
Warranty
Armstrong pumps are covered by Armstrong's standard terms of sale and warranty. Review the full terms below for coverage details.
Installation, Maintenance, Genuine Parts & Parts Kits
- 4270 and 4270 Stock Motor Mounted Pump Installation & Operating Instructions (PDF)
- Series 4270 Seal and Impeller Replacement Instructions (PDF)
- Pump FlushLine Hose & Hardware Kits Instructions (PDF)
- 4270 Stock Motor Mounted Pumps Parts List (PDF)
Always use genuine Armstrong parts, including seals, bearings and parts kits, to keep your 4270 performing to specification.
Please note: Motors and accessories vary by configuration. Not sure which seal kit or replacement parts you need for your 4270 Stock 42ST? Contact Canadian Pump Shop and we'll help match them to your system.