Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Variable pressure water supply equipment without negative pressure type WF
    Variable pressure water supply equipment without negative pressure type WF
    Variable pressure water supply equipment without negative pressure type WF
    Variable pressure water supply equipment without negative pressure type WF
    Variable pressure water supply equipment without negative pressure type WF
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    • Variable pressure water supply equipment without negative pressure type WF
    • Variable pressure water supply equipment without negative pressure type WF
    • Variable pressure water supply equipment without negative pressure type WF
    • Variable pressure water supply equipment without negative pressure type WF
    • Variable pressure water supply equipment without negative pressure type WF

    Category:

    Constant Pressure Water Supply Equipment

    Keywords:

    Pump

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    Variable pressure water supply equipment without negative pressure type WF

    Flow: 8-40m³/h 

    Lifting height: 32-138m 

    Power of a pump: 0.75-15kw 

    Water inlet diameter: 40-100mm 

    Water outlet diameter: 40-100mm 

     

    Applicable floors: 5-30 floors Price: 286,000-308,000 WF type water supply equipment without negative pressure is a system that introduces water from the drinking water network into a stable flow balancer (stabilizer tank without negative pressure). When the speed controller detects that the pressure inside the stable flow balancer (stabilizer tank without negative pressure) is positive, the pump is activated and continuously adjusts the pump speed according to the amount of water used and the pump outlet pressure, until the pump operates at a constant speed at a certain point 

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    Product description

    　　The variable pressure water supply equipment without negative pressure type WF introduces water from the drinking water network into a stable flow balancer (negative pressure stabilizer tank). When the speed controller detects that the pressure inside the stable flow balancer (negative pressure stabilizer tank) is positive, the water pump is activated and continuously adjusts the pump speed according to the amount of water used, that is, according to the feedback output pressure of the pump, until the pump operates at a constant speed at a set pressure value.

     

    　　When the drinking water network supplies water normally, the pressure inside the stable flow balancer (negative pressure stabilizer tank) must be equal to the pressure of the drinking water network and vary with the network pressure. However, during peak consumption hours, due to the insufficiency of the water supply from the network, if the amount of water entering the stable flow balancer (negative pressure stabilizer tank) cannot meet the amount of water leaving, a vacuum may be generated inside the balancer, that is, a negative pressure, which manifests as an interface between the water and air inside the balancer. At this moment, the vacuum suppressor acts to prevent the formation of a vacuum, ensuring that the balancer does not cause a siphon effect in the network; on the other hand, to eliminate the layer of air inside the balancer and restore the working pressure inside the balancer, the pump changes from constant speed to reduced speed to balance the water input and output of the balancer, thus maintaining a minimum water supply. When the normal working pressure is restored inside the balancer, the pump returns to its previous operating state. In this way, even at the moment when negative pressure appears, the system maintains a continuous water supply, unless there is a failure in the network supply that causes a lack of water in the balancer, at which point the pump stops immediately. The system is equipped with an emergency power supply EPS that automatically activates when the power is cut off to maintain a continuous water supply for no less than 30 minutes.

    Product parameters

    Structural composition of the water supply equipment without negative pressure and with variable frequency type WF:

    The secondary water supply equipment without negative pressure type WF is mainly composed of a variable frequency control cabinet with microcomputer, PLC, and human-machine interface (touch screen), a set of water pumps, stable flow compensator, vacuum suppressor, various high-sensitivity sensors, various pipes, valves, etc. The water supply equipment with superimposed pressure and stable flow is composed of a stable flow compensator, a set of pumps, pipes, and speed controller.

     

    Product features:

    1. The water supply equipment without negative pressure type WF can directly introduce water from the urban drinking water network to high residential buildings, without the need for low water tanks or elevated tanks in the intermediate process, that is, the purified water enters directly into the home.

    2. When the water supply equipment without negative pressure is used together with a pressure tank for fire protection, and complying with fire safety standards, the low water tank and elevated tank can be gradually eliminated, which not only saves cleaning and disinfection costs but also has evident effects on energy and water savings.

    3. All the water supply equipment without negative pressure is made of stainless steel, is non-toxic, harmless, non-corrosive, hygienic, with low noise, which helps to improve the surrounding environment, being an eco-friendly and energy-saving product.

    4. The operation of the water supply equipment without negative pressure is monitored and controlled automatically by computer, with control functions such as frequency variation in the pump cycle, soft start at industrial frequency, constant and variable pressure water supply, rapid elimination of negative pressure, pipeline network protection, failure alarm, and communication.

    5. The water supply equipment without negative pressure operates stably, safely, and reliably, does not require personnel for supervision, and is characterized by its simple operation, easy maintenance, and low operating costs.

    6. The water supply equipment without negative pressure uses advanced control technology against negative pressure, which under any circumstances does not generate any negative impact on the drinking water network, while ensuring a continuous and normal water supply.

    Scope of application of the water supply equipment without negative pressure and variable frequency type WF:

    1. Applicable for the upgrading, remodeling, and expansion of secondary water supply systems in already constructed high buildings such as residential complexes, apartments, office buildings, hotels, and hospitals.

    2. Applicable for the design of upgrading secondary water supply systems in high buildings under construction or to be built, such as residential complexes, apartments, office buildings, hotels, and hospitals.

    3. Applicable for high buildings that require segmented water supply (i.e., separate supply for domestic use, fire protection, and toilet flushing).

    4. Applicable for high buildings that eliminate the supply of low water tanks and elevated tanks.

    5. Applicable in cases where the quality of the water supply from the existing secondary system does not meet standards.

    Comparison between the water supply equipment without negative pressure and variable frequency type WF and traditional secondary water supply:

    The traditional method of secondary water supply in high buildings generally uses low water tanks, elevated tanks, and pressure tanks. Because tanks and reservoirs are prone to "secondary water contamination", prolonged consumption affects people's health. Therefore, the effective way to improve the quality of water supply in high buildings and raise health standards is to eliminate low water tanks and elevated tanks.

    　　The fully automatic water supply equipment without negative pressure is a product recently developed by the water supply equipment company. It uses advanced control technology with microprocessor, variable speed control, and stable flow and negative pressure prevention technology, forming a fully automatic water supply system with superimposed pressure and stable flow, widely applicable for secondary water supply without contamination in high buildings.

    　　The water supply equipment without negative pressure uses a superimposed pressure and stable flow water supply device without contamination, which introduces drinking water directly to homes, known as the "clean water project at home" popular in European and American countries, allowing residents of high buildings to drink clean and safe drinking water. The automatic water supply equipment Zhikang is a set of secondary water supply equipment that can be directly connected to the drinking water network without causing any negative effects. It can replace low water tanks and elevated tanks, fully utilizing the pressure of the drinking water network to supply water directly, avoiding "secondary water contamination", ensuring that the water quality meets national drinking water standards, and at the same time saving investment in construction, energy, water, and reducing operating and management costs.


     

    　　Please refer directly to the performance parameters on the pump selection page.

    Changsha Zhonglian Pump Industry Co., Ltd.

    Why Choose Us?

    Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    FAQ

    Q

    What products do you mainly produce?

    A

    Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

    Q

    Can you help me choose a model?

    A

    Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

    Q

    Why is the price quotation so slow?

    A

    Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common 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 clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

    Q

    What information should I provide when I need a quote?

    A

    Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

    Q

    Do you have centrifugal pumps in stock?

    A

    There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

    Q

    What is your usual delivery time?

    A

    Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。

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