Cleanroom HVAC and Air Handling Equipment

Hot-Water Circulation Pump

A compact vertical in-line centrifugal pump that maintains heating-water flow through AHU coils, reheat circuits and hydronic terminal branches.

In-Line Pipe Installation
Compact Plantroom Footprint
Efficient Vertical Motor
Serviceable Pump Cartridge

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Product Introduction

The vertical in-line pump places suction and discharge flanges on a common centerline so it can be installed directly in a heating-water header. A close-coupled motor and removable rotating cartridge reduce floor space compared with base-mounted equipment. The cast-iron body and mechanical seal are selected for closed hydronic water, while optional speed control maintains differential pressure as control valves modulate.

Key Features

Equal in-line flanges simplify connection to straight horizontal supply or return headers.

Vertical motor placement uses little floor area and keeps the rotating assembly accessible from above.

A removable cartridge permits motor, coupling and seal service without removing the pump body from pipework.

Integrated variable-speed control can maintain pressure, temperature differential or scheduled circulation.

Customer Product Concerns

Heating loops need dependable circulation in crowded plantrooms without excessive pressure or standby heat loss.

A base-mounted pump consumes valuable mechanical-room floor space.The in-line body supports a vertical motor directly above the pipe centerline.

Constant flow creates valve noise when many zones close.Speed control reduces pump head as heating demand falls.

Seal maintenance normally requires draining and cutting the header.The top pull-out cartridge leaves the flanged red pump body installed.

Hot water transfers heat into nearby electrical components.A ventilated coupling section separates the motor from the hot volute.

Typical Applications

Cleanroom AHU hot-water coilsTerminal reheat loopsHospital heating-water branchesLaboratory perimeter heatingHeat-recovery circulation circuits

Technical Parameters

Common physical ranges for a commercial vertical in-line hydronic pump are shown below.

Core Material	Cast-iron in-line body with stainless shaft and bronze or stainless impeller
Panel Thickness	6-12 mm integral mounting-foot and motor-bracket thickness
Effective Width	200-650 mm flange-to-flange width
Maximum Length	Up to 1600 mm overall pump-and-motor plan length
Steel Facing Thickness	1.2-2.0 mm perforated coupling guard
Core Density	Approximately 7000-7300 kg/m³ for cast-iron in-line pump-body material
Thermal Conductivity	Approximately 45-55 W/(m·K) for cast-iron pump body
Surface Finish	Heat-resistant red epoxy coating with passivated fasteners
Joint Type	Equal in-line flanged ports with close-coupled removable motor cartridge
Customization	Available based on the intended application and operating environment.

Available Options

Single-head or twin-head pumpIntegrated variable-speed motorBronze or stainless impellerMechanical-seal combinations for glycol and elevated temperature

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