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SPX FLOW Horticulture Circulation Pumps for Efficient Heating

SPX FLOW horticulture circulation pumps provide efficient and consistent heating for modern greenhouse systems. Designed for durability and energy savings, they ensure stable water circulation and optimal temperature control, improving plant growth conditions while reducing operational costs for commercial growers.
  • CL/CLB/CBH/CB

  • SPX /Johnson

  • Cast iron, Stainless steel, Bronze alloys

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Introduction of Circulation Pump

A Heated Water Circulation System serves as the central technology behind precise temperature regulation in modern horticultural greenhouses. Its main goal is to provide a stable, evenly distributed environment that supports healthy and consistent plant growth by circulating warm water through an interconnected piping system.

Typically, this system is powered by a central boiler or a buffer tank that stores heated water. The heat is efficiently transferred across all greenhouse zones through a carefully designed network controlled by circulation pumps and an automated control unit. This advanced setup allows growers to achieve highly efficient, energy-saving climate control essential for modern greenhouse production.

热水循环泵0

Working Principle of Circulation Pump

The Heated Water Circulation System functions on a closed-loop mechanism, ensuring consistent and efficient heat transfer throughout the greenhouse. Its process can be divided into three main stages:

1. Heat Generation:

  • The system primarily relies on a boiler fueled by natural gas to produce heat.

  • During combustion, the boiler also generates CO₂, which can be redirected into the greenhouse to promote photosynthesis.

  • In some setups, heat may also come from external energy sources such as a Combined Heat and Power (CHP) plant or a district heating network.

2. Heat Storage & Exchange:

  • The generated heat can be stored temporarily in a large buffer tank, ready for use when needed.

  • When using an external heating source, or when separating the boiler circuit from the greenhouse circuit, the heat is transferred through a dedicated heat exchanger for optimal safety and efficiency.

3. Heat Distribution:

  • Circulation Pumps function as the heart of the system, pushing hot water through the extensive pipe network.

  • A manifold system divides and directs the heated water into different zones of the greenhouse.

  • A smart control system continuously monitors temperature and adjusts the flow rate and water temperature according to real-time climate data and crop requirements, ensuring every growing area maintains its ideal heat level.

Types & Modular Design of Circulation Pump

SPX Johnson Pump's Horticulture range is designed around a strong modular concept, offering high component interchangeability. The series consists of two main structural types, comprising four primary product families.

Pump Type Overview

Type Product Series Structure Installation Port Orientation Key Feature
1. In-Line Combiline (CL) Built-In In-Line Pump Directly into pipeline In-line, flanges on same axis Compact, space-saving, minimizes pipeline stress
CombilineBloc (CLB) Built-In In-Line Pump Directly into pipeline In-line, flanges on same axis Compact, space-saving, minimizes pipeline stress
2. Monobloc CombiBlocHorti (CBH) Close-Coupled, Foot-Mounted Pump Baseplate mounted Horizontal inlet, vertical outlet Robust construction for wider operating ranges
CombiBloc (CB) Close-Coupled, Foot-Mounted Pump Baseplate mounted Horizontal inlet, vertical outlet Robust construction for wider operating ranges
circulation pump

Combiline - CL

circulation pump

CombilineBloc - CLB

circulation pump

CombiBlocHorti - CBH

circulation pump

CombiBloc - CB


Core Modular Design (Back-Pull-Out Units)

The four pump series share two common Back-Pull-Out (BPO) units, enabling easy maintenance without disconnecting the pipes.

Shared Unit 1 (CL & CBH):
  • Features a stainless steel extended motor shaft.

  • The impeller is mounted directly onto the motor shaft.

  • Designed with centering bosses for optimal motor alignment and reduced heat transfer to the motor.

Shared Unit 2 (CLB & CB):
  • Uses a standard IEC flange motor.

  • A stainless steel stub shaft is fitted onto the motor shaft to drive the impeller.

Key Universal Technical Features

  • Mechanical Seal: All pumps are fitted with a rubber bellows mechanical seal per EN 12756, with Carbon/Silicon Carbide faces, suitable for high temperatures.

  • Electric Motor: Motors are suitable for European voltages, feature protection class IP55, and are available in various speeds (4-pole/6-pole), two-speed (Dahlander connection), and frequency-controlled options.

Technical Specifications of Circulation Pump

Model
CL/CLB
CBH/CB
Max. capacity 50Hz 400 m³/h 600 m³/h
60Hz 500 m³/h 800 m³/h
Delivery head
50Hz 1 - 28 m
1 - 35 m
60Hz 2 - 40 m 2 - 50 m
Max. temperature

140℃
140℃
Max. working pressure
6 bar (ND6)
10 bar (ND10)
10 bar (ND10)
Materials
pump casing
EN-GJL-250 (GG25) EN-GJL-250 (GG25)
impeller EN-GJL-200 (GG20) EN-GJL-200 (GG20)
motor shaft
X17CrNi 16-2 (1.4057) X17CrNi 16-2 (1.4057)
stub shaft X2CrNiMo17.12.2 (1.4404) X2CrNiMo17.12.2 (1.4404)
shaft sleeve
G-CuSn7ZnPb (Rg 7) G-CuSn7ZnPb (Rg 7)
Nominal motor speed
1450 min-1, 50 Hz 4 poles 

  950 min-1, 50 Hz 6 poles 

1750 min-1, 60 Hz 4 poles 

1150 min-1, 60 Hz 6 poles

2 Speed motor with Dahlander connection
1450/950 min-1, 50 Hz 4/6 poles 

1750/1150 min-1, 60 Hz 4/6 poles

Frequency control wall mounted
from 1.1 kW, range 10 to 60 Hz
Electric motor protection class

IP55
Electric motor voltage

230/400 V (≤ 1.5 kW), 50 Hz 

400/695 V (≥ 2.2 kW), 50 Hz 

277/480 V (≤ 1.5 kW), 60 Hz 

480/830 V (≥ 2.2 kW), 60 Hz 

other voltages/speeds on request

Mechanical seal

EN 12756 (DIN 24960), AQ1EGG 

carbon/silicon carbide, EPDM bellows


Advantages of Circulation Pump

1. Outstanding Reliability and Maximum Efficiency

  • Combines exceptional durability with superior energy efficiency, making it the perfect solution for greenhouse heating and cooling systems.

  • Hydraulic components are optimized using Computational Fluid Dynamics (CFD) to ensure precise and reliable performance that meets or exceeds design standards.

2. Remarkable Energy Savings and Eco-Friendly Operation

  • Equipped with frequency-controlled motor drives that automatically adjust pump speed to match real-time demand, significantly reducing energy usage.

  • For example, a 20% speed reduction can achieve nearly 50% energy savings.

  • Dual-speed motors (Dahlander connection) offer a simple, cost-effective way to cut power consumption.

  • Optional insulation kits for pumps and valves minimize heat loss, saving large volumes of gas annually while promoting sustainability.

3. Smart Control and Flexible Operation

  • Developed in collaboration with Danfoss, integrating advanced VLT®  HVAC Drive FC 102 controllers for easy servicing and precise control.

  • Features such as Automatic Motor Adaptation (AMA) and Automatic Energy Optimization (AEO) simplify setup and ensure the best efficiency.

  • Pumps can seamlessly operate at variable speeds, automatically adapting to the greenhouse’s climate needs.

4. Modular Design and High Interchangeability

  • Designed with a modular structure that allows components such as impellers, seals, and drive sections to be interchanged across multiple pump series (CL, CLB, CBH, CB).

  • This reduces spare part requirements, simplifies maintenance, and enhances operational flexibility.

5. Flexible Installation Options

  • Can be mounted in either horizontal or vertical positions between pipeline sections, giving users greater layout versatility.

  • Offered as in-line pumps (CL/CLB) for direct pipeline integration or as close-coupled, foot-mounted models (CBH/CB) for space-saving installations.

6. Durable Construction and High-Quality Materials

  • Pump Casing: EN-GJL-250 (GG25)

  • Impeller: EN-GJL-200 (GG20)

  • Motor Shaft: Stainless Steel X17CrNi16-2 (1.4057)

  • Mechanical Seal: EN 12756 compliant, bellow-type with carbon/silicon carbide pairing, ensuring long-lasting reliability and wear resistance.

7. Advanced Selection and Simulation Tools

  • The “Hydraulic Investigator” software enables precise pump selection tailored to system specifications.

  • It can simulate variable-speed performance, compare multiple configurations, and display energy-saving potential—helping users reduce power costs effectively.

8. Global Support & User-Friendly Interface

  • Supported by a global service network and online technical resources.

  • The integrated Local Control Panel (LCP) offers 27 display languages and an intuitive, user-friendly interface for effortless operation anywhere in the world.

Application of Circulation Pump

circulation pump
circulation pump
circulation pump
circulation pump

Over the past few decades, continuous research and innovation have brought a wave of advanced technologies into modern greenhouses.

These advancements have transformed greenhouse operations into a highly sophisticated industry, with systems and expertise now shared and implemented across the globe. Among the essential technologies are pump circulation systems and their integrated control units.

With today’s cutting-edge solutions, growers can fine-tune environmental conditions with remarkable precision. Maintaining stable temperatures is crucial, and this depends heavily on circulation pumps that offer dependable performance while minimizing energy use. The SPX FLOW Johnson Pump series stands out in this regard, delivering superior reliability and efficiency for both heating and cooling applications.

FAQs for Circulation Pump

The system operates on a closed-loop circuit, ensuring efficient and controlled heat delivery. The core process is as follows:

1. What is the role of a heated water circulation pump in a greenhouse?

It ensures consistent temperatures by circulating hot water through the greenhouse's heating system, creating optimal conditions for plant growth.

2. What types of pumps are commonly used in greenhouses?

SPX FLOW provides four pump types: CombiLine (CL), CombiLineBloc (CLB), CombiBlocHorti (CBH), and CombiBloc (CB), available in in-line or close-coupled monobloc configurations.

3. What are the maximum temperature and pressure ratings for these pumps?

Depending on the model, these pumps can operate at temperatures up to 140°C and pressures up to 10 bar.

4. What materials are used to construct these pumps?

The pump casings and impellers are made of cast iron (EN-GJL-250/200), with shafts and sleeves crafted from stainless steel and bronze alloys for enhanced durability.

5. Who manufactures and distributes these pumps?

SPX FLOW (Netherlands) manufactures the pumps, and Changzhou Top Greenhouse Co., Ltd. serves as the exclusive distributor in China.

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