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

G-type single-screw pump

Flow rate: 0.8–150 m³/h
Head: 60-120m
Power: 0.75–37 kW
Rotational speed: 400–960 rpm
Pressure: 0.6–1.2 MPa
Price: 0.11–52,600

The G-type screw pump is an internal-gear rotary positive-displacement pump. As the single-thread helical rotor revolves around the stator axis in a double-thread helical stator bore, the sealed cavities formed between the rotor and the stator continuously, uniformly, and at a constant volume transport the medium from the suction end to the discharge end.

Hotline:

+86 0731-88632200

classification：

Other pumps

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

　　Single-screw pumps are already widely used in developed countries. Abroad, most refer to single-screw pumps as “Monopumps,” while in Germany they are known as “Eccentric Rotor Pumps.” Thanks to their excellent performance, the scope of their application in China has also been expanding rapidly in recent years.

　　The G-type single-screw pump’s greatest features are its strong adaptability to various media, stable flow rate, minimal pressure pulsation, and high self-priming capability—qualities that no other type of pump can match.

　　Our company has conducted thorough analysis and research on single-screw pumps manufactured abroad (e.g., in Germany, the UK, France, Japan, and other countries) as well as on similar products from domestic counterparts. By drawing on the strengths of various sources, we continuously innovate and reform our own products. Currently, our products have developed into a complete system, with operating pressures ranging from 0.6 to 1.2 MPa; under special requirements, the pressure can reach up to 3 MPa, thereby meeting the diverse needs of a wide range of customers for single-screw pumps.

　　The screw pumps manufactured by our company are reliable in quality, come with a three-guarantee policy, and are offered at relatively low prices. We also ensure the regular supply of spare parts and components.

　　Our organization is wholeheartedly committed to serving our customers and accepts custom design and manufacturing tasks for single-screw pumps tailored to specific customer requirements.

Product Parameters

Meaning of G-type single-screw pump model:

Structural features of G-type single-screw pumps:

　　1 Discharge port, 2 Pull rod, 3 Stator, 4 Screw shaft, 5 Universal joint assembly, 6 Suction port, 7 Connecting shaft, 8 Packing seat, 9 Packing gland, 10 Bearing housing, 11 Bearing cover, 12 Motor, 13 Coupling, 14 Shaft sleeve, 15 Bearing, 16 Transmission shaft, 17 Base

　　 Delivery method:

　　A G-type screw pump is an internal gear rotary positive-displacement pump. When the single-threaded helical rotor revolves around the stator axis in a double-threaded helical stator bore, the sealed chambers formed between the rotor and the stator continuously, uniformly, and at a constant volume transport the medium from the suction end to the discharge end. Due to these characteristics, single-screw pumps are particularly well-suited for the following operating conditions:

　　Transportation of high-viscosity media. Depending on the pump’s rotational speed, materials with viscosities as high as 1,000,000 CPS can be effectively conveyed. The pressure can reach 0.6, 1.2, 1.8, or 2.4 MPa. The temperature of the conveyed medium is below 80℃ (special requirements allow up to 150℃).

　　A medium containing solid particles or fibers. The particle size can be as large as 20 mm (not exceeding the rotor eccentricity), and the fiber length can reach up to 150 mm (equivalent to 0.4 times the rotor pitch). The solid content typically ranges up to 30%; when the medium contains fine, powdery solid particles, the solid content can reach as high as 70% or even higher.

　　One requirement is continuous conveyance with stable pressure, without the periodic pulsations characteristic of reciprocating pumps.

　　One requirement is that the conveying system should cause minimal agitation and not shear the original structure of the medium being conveyed.

　　The transmission can be directly driven by a coupling, or it can use a speed-regulating motor, V-belt, gearbox, and other devices to achieve speed variation.

　　The flow rate has a linear relationship with the rotational speed, allowing for convenient adjustment of the flow rate by simply modifying the rotational speed, thus achieving precise flow control.

　　Please note:

　　1. The test data in the performance table are based on clear water at 20℃ with a viscosity of 1 mm²/s.

　　2. When the pump is used to convey media with high viscosity or containing particles, the pump’s rotational speed must vary depending on the properties of the medium.

　　3. When the pump is used to convey media with varying degrees of abrasiveness, the pump’s rotational speed must also differ accordingly.

Performance features:

　　·Maximum suction lift height: up to 6 meters of water column

　　·Can rotate in both directions and convey material in either direction (requires a reverse-rotation stator).

　　·Flexible installation method.

　　· Smooth and stable operation, low noise, no pulsation, and no shear.

　　·Medium temperature range: -20℃ to +150℃

　　·Single-screw pumps have few parts, a compact structure, and a small footprint, making them easy to maintain. The rotor and stator are the pump’s wear-prone components; their simple design facilitates quick assembly and disassembly. The drive can be achieved either through direct coupling or by using a speed-regulating motor, V-belt, gearbox, or other similar devices for speed variation. Different single-screw pumps are suited to different specific application scenarios.

Application range of G-type single-screw pumps:

　　In general, single-screw pumps can serve as versatile pumping devices. Their operating speeds can vary widely, from high to low. For stainless steel screw pumps, the rated outlet pressure increases with the number of pump stages—each additional stage adds 0.6 MPa to the pressure—thus giving these pumps an extremely broad range of applications.

　　1. Environmental Protection: Transport of industrial wastewater, domestic sewage, and turbid sludge containing solid particles and short fibers. Particularly suitable for equipment such as oil-water separators and plate-and-frame filter presses.

　　2. Shipbuilding Industry: Transportation of media such as bilge water, oil-water mixtures, oil sludge, and oily wastewater.

　　3. Petroleum Industry: Transporting Crude Oil. In recent years, it has been particularly successful in extracting mixtures of crude oil and water from depths of several kilometers underground, as well as mixtures of coalbed methane and water from coalfields, thereby significantly reducing the costs associated with mechanical oil and coalbed methane recovery. As oilfields enter the later stages of production, screw pumps are used to inject polymers into the reservoirs, enhancing oil recovery rates.

　　4. Pharmaceuticals and Daily Chemicals: Transportation of various viscous pastes, emulsions, and soft ointments and cosmetics.

　　5. Food canning industry: Conveying various viscous starches, edible oils, honey, sugar syrups, fruit pulps, creams, fish and meat mince, as well as their by-products.

　　6. Brewing Industry: Various fermented viscous liquids, concentrated distiller’s grains, residues from grain products, various sauces, pulps, and mucilaginous substances containing solid chunks, etc.

　　7. Construction industry: Spraying and conveying of cement mortar, lime paste, coatings, and other paste-like materials.

　　8. Mining Industry: Solid-particulate-containing underground and slurry wastewater from mine shafts is discharged to the surface.

　　9. Chemical Industry: Various suspensions, oils and fats, diverse colloidal pastes, and various adhesives.

　　10. Printing and papermaking industries: conveying high-viscosity inks, PVC polymer pastes for wallpaper, pulp of various concentrations, and short-fiber slurries.

Performance Parameter Table:

Model	Rotational speed r/min	Traffic m3/h	Pressure MPa	Motor KW	Head height m	Import	Export mm	Allow particle diameter mm	Allow fiber length mm
G20-1	960	0.8	0.6	0.75	60	Dy25	Dy25	1.5	25
G25-1	960	2	0.6	1.5	60	Dy32	Dy25	2	30
G25-2	960	2	1.2	2.2	120	Dy32	Dy25	2	30
G30-l	960	5	0.6	2.2	60	Dy50	Dy40	2.5	35
G30-2	960	5	1.2	3	120	Dy50	Dy40	2.5	35
G35-1	960	8	0.6	3	60	Dy65	Dy50	3	40
G35-2	960	8	1.2	4	120	Dy65	Dy50	3	40
G40-l	960	12	0.6	4	60	Dg80	Dg 65	3.8	45
G40-2	960	12	1.2	5.5	120	Dg80	Dg 65	3.8	45
G50-l	960	20	0.6	5.5	60	Dg100	Dy80	5	50
G50-2	960	20	1.2	7.5	120	DylOO	Dy80	5	50
G60-l	960	30	0.6	11	60	Dyl25	DylOO	6	60
G60-2	960	30	l.2	15	120	Dyl25	DyOO	6	60
G70-l	720	45	0.6	11	60	D y l50	Dyl25	8	70
G70-2	720	45	I.2	18.5	120	0yl50	Dyl25	8	70
G85-1	720	65	0.6	15	60	Dyl50	Dyl50	10	80
G105-1	500	100	0.6	22	60	Dy200	Dy200	15	110
Gl35-l	400	150	0.6	37	60	Dy250	Dy250	20	150

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.

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+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

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

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