Changsha Zhonglian Pump Industry Co., Ltd.

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Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

Box-type variable-frequency water supply equipment without negative pressure

Box-type variable-frequency water supply equipment without negative pressure

Flow rate: 0.4–1080 m³/h

Head: 6–305 m

Price: 51,500–485,000

The pressure-free variable-frequency water supply equipment is another new product independently developed by our company based on our existing pressure-free variable-frequency water supply equipment. It can both utilize the pressure from the municipal water network for pressure-free variable-frequency water supply and draw water from a storage tank to provide constant-pressure variable-frequency water supply. This product fully integrates the advantages of both constant-pressure variable-frequency water supply equipment and pressure-free variable-frequency water supply equipment.

Hotline:

+86 0731-88632200

classification：

Constant-pressure water supply equipment

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

The box-type variable-frequency water supply equipment with no negative pressure is another new product independently developed by our company based on our existing variable-frequency water supply equipment with no negative pressure. It consists of five major components: a water tank, a pump unit, a constant-flow tank, an intelligent pressurization and stabilization device, and a central control system. This equipment can both utilize the pressure from the municipal water network for variable-frequency water supply without negative pressure and draw water from the water tank to provide constant-pressure variable-frequency water supply. It fully integrates the advantages of both constant-pressure variable-frequency water supply equipment and variable-frequency water supply equipment with no negative pressure. Equipped with air-cooled motors and air-cooled bearings, this equipment features a completely sealed design that prevents any water leakage and operates at a noise level below 50 decibels. Moreover, it addresses the issue of limited tank space, making it a highly reliable variable-frequency water supply device with no negative pressure. The equipment also boasts powerful remote (wireless) communication and monitoring capabilities, as well as a user-controlled central monitoring room (optional); a user-friendly touch-screen human-machine interface; fully AI-based control; and remote warranty and early-warning services.

Product Parameters

Product advantages of box-type variable-frequency water supply equipment without negative pressure:

1. Sufficient water supply: The box-type non-negative-pressure water supply equipment can be connected in series with the municipal water network, ensuring that no negative pressure is generated in the municipal network. During peak water demand periods, a microcomputer-controlled variable-frequency drive adjusts the pump to boost the water pressure in the sealed water tank, thereby preventing insufficient water supply to users caused by inadequate supply from the municipal network.

2. Intelligent Water Supply: When the pressure in the public water supply network is ≤ 0.2 MPa (the threshold can be freely set between 0.2 and 0.4 MPa), the negative-pressure-free device shuts down, while the negative-pressure-free water intake device opens, and water is supplied from the water tank. Conversely, when the pressure in the public water supply network reaches ≥ 0.2 MPa, the negative-pressure-free device turns on after a delay of 10 minutes (the delay time is adjustable), and the negative-pressure-free water intake device shuts down; at this point, water is supplied directly from the public water supply network.

3. Clean water source with stable pressure: The water stored in the non-negative-pressure tank is circulated every 6 hours via intelligent control, ensuring fresh and clean water quality. The variable-frequency pump in the box-type non-negative-pressure water supply equipment operates at a constant speed, leveraging the existing pressure of the tap water to achieve pressure boosting and maintain a consistent pressure level required by users.

4. Protecting the official website’s water pressure: To regulate peak water consumption, an intelligent solenoid valve has been installed at the inlet of the water tank to control both the incoming water pressure and the water level. When the network pressure drops and the booster pump draws water from the tank, the intelligent control system ensures that, once the water level in the tank falls below a certain threshold, the solenoid valve automatically opens to draw water from the network, thereby maintaining the required pressure at the water intake point. This measure not only helps avoid peak water consumption by smoothing out demand fluctuations—thus playing a role in peak-shaving—but also prevents the zero-pressure drainage typically seen in conventional water tanks, providing excellent protection for the network pressure.

5. Intelligent Booster Pump: When the tap water pressure is sufficient to meet users’ water demand, the booster pump remains in a dormant state thanks to frequency conversion control. However, during non-peak hours when the tap water pressure falls short of the required user pressure, the pump can boost the water pressure by adding extra pressure on top of the existing tap water pressure (0.2–0.5 MPa). It precisely compensates for the difference, fully utilizing the residual pressure and thereby significantly saving electricity. The energy-saving effect is remarkable.

6. Environmentally friendly and pollution-free: All water-contact materials in the product are made of 304 food-grade stainless steel, and the accompanying pressure tanks and water-sealing materials meet hygiene standards, thereby avoiding various water-source contamination issues associated with traditional reservoirs (water tanks).

7. Intelligent Frequency Conversion: During pressurized water supply, the equipment can fully leverage the inherent pressure potential of the municipal water source—supplementing exactly the amount needed to make up for any shortfall—and thereby maximize the energy-saving benefits of variable-frequency speed control.

8. High Efficiency and Energy Saving: To further reduce energy consumption and avoid unnecessary work, the product employs automatic pressure-control technology. This technology also effectively addresses the issue of critical-flow oscillations that often occur during pump start-up and shut-down transitions, while simultaneously enhancing the comfort of water supply.

9. The designed variable-frequency control cabinet features high intelligence: It achieves detection, alarm, and automatic switchover for two water sources; and it enables unified scheduling and rational management of all stages—including water tank replenishment, water storage, source switching, and pressurized operation.

Application scope of box-type variable-frequency water supply equipment without negative pressure:

1. Applicable geographical scope: Suitable for pressurized water supply in areas with relatively sufficient municipal network pressure.

2. Applicable engineering types: Production facilities in industrial and mining enterprises, industrial water supply systems, and large-scale intermediate booster pump stations for municipal water plants.

3. Applicable project areas: Secondary pressurization system for water supply;

4. Other applicable scopes: Domestic water supply for newly constructed, renovated, or expanded residential buildings, office buildings, hotels, restaurants, and other public buildings.

Friendly Reminder ： For performance parameters, please go directly to Pump Selection Direct page query

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

What is your typical delivery time?

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Do you have centrifugal pumps in stock?

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

What information should I provide when requesting a quote?

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

What products do you mainly produce?

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Could you help me with the selection?

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Why is it so slow to get a price quote?

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

Fire-fighting booster and pressure-stabilizing water supply equipment

Variable-frequency constant-pressure secondary water supply equipment

Fire-fighting booster and pressure-stabilizing water supply equipment

Variable-frequency constant-pressure secondary water supply equipment

+86 0731-88632200

Export Trade/Technical Support:

+86 153-4831-2290

Head Office Email:

zoomlian@yeah.net

No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor

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Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

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Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

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