Bell & Gossett 90-31S Series 90 Centrifugal Pump 1/4HP

Handle low-flow commercial circulation with Bell & Gossett 90-31S Series 90 centrifugal pump for hydronic zone control and small-scale recirculation. Its 1/4 HP single-phase motor accepts 115 or 208–230 volts and runs at 1,750 RPM. The 1-1/4-inch AA flanged connection and 5-1/8-inch bronze impeller identify the supplied low-flow configuration. Confirm the system curve, piping dimensions, electrical service, and installation clearance before replacement.

The 90-31S uses a 5-1/8-inch bronze impeller in a Series 90 low-flow in-line centrifugal arrangement. Its single-phase motor accepts 115 or 208–230 volts and operates at the listed standard speed of 1,750 RPM. The 1-1/4-inch AA designation identifies the flanged pump size for piping comparison. The supplied specifications do not state flow, head, seal materials, bearing design, dimensions, weight, working pressure, or fluid temperature, so verify those details before ordering.

Key Features & Benefits

• 1/4 HP Motor: Fits compatible hydronic zone-control and small commercial recirculation duties.
• Single-Phase Voltage: Supports 115 or 208–230-volt service after confirming the field supply.
• 1-1/4-Inch AA Flange: Helps contractors match the low-flow pump to existing piping.
• 5-1/8-Inch Bronze Impeller: Provides a defined hydraulic component for model comparison.
• 1,750 RPM Operation: Gives technicians a standard speed reference for replacement review.
• Series 90 Low-Flow Design: Targets zone control and small-scale commercial recirculation applications.

Why Choose Bell & Gossett 90-31S

The 90-31S provides a small Series 90 configuration for hydronic zones and limited commercial recirculation duties. Its 1/4 HP motor, 1-1/4-inch flange, and bronze impeller help contractors distinguish this low-flow model from larger Series 90 pumps.

• Build: The bronze impeller and 1-1/4-inch AA flanged layout define the supplied pump arrangement.
• Value: Matching the smaller piping interface can reduce unnecessary modifications during zone-pump replacement.
• Audience: Fits HVAC contractors, boiler technicians, commercial plumbers, and facility teams managing smaller loops.

Applications & Use Cases

Use this pump for hydronic zone control and small-scale commercial recirculation where the required operating point matches the Series 90 low-flow configuration. Check the 1-1/4-inch flange dimensions, gasket fit, pipe alignment, valve clearance, motor access, and electrical service. Flow, head, overall dimensions, and weight are not supplied, so verify the system curve and replacement envelope before purchase.

Warranty & Support

• Warranty Terms: Warranty duration, coverage, exclusions, and registration requirements require confirmation from the authorized seller.
• Service Requirements: Confirm whether authorized service is required for warranty claims before purchase.
• Model Verification: Match Bell & Gossett 90-31S and SKU 179040LF to the seller’s order documentation.

Verify voltage, align the 1-1/4-inch flange, purge air from the hydronic loop, inspect strainers, and check for leaks during startup. Select the pump from the actual system curve because flow and head are not stated in the supplied data. Find the Bell & Gossett 90-31S Series 90 centrifugal pump at Mulmotor.com for authentic equipment, applicable warranty coverage, and technical pump support.