G series variable speed screw pump front view

G Series Stepless Speed Regulating Progressive Cavity Pump

Model NO. G Series Stepless Speed Regulating Progressive Cavity Pump

Pump material： Cast Iron, Stainless Steel

Inlet & Outlet Size: DN25–DN250

Flow Range: 0.15–150 m³/h

Pressure: 0.6–2.4 MPa

Motor Power: 0.75–55 kW

Speed: 10 r/min–960 r/min

Particle Size: 1.5–20 mm

Fiber Length: 25–150 mm

Voltage: 220V / 380V / 415V / 440V / 460V

What is G Series Stepless Speed Regulating Progressive Cavity Pump？

The G series stepless speed regulating progressive cavity pump (single screw pump) functions as a versatile positive displacement unit that balances smooth flow output with strong operational adaptability. Designed as an adjustable variable speed pump, it delivers high suction lift alongside low pressure pulsation, enabling simple transfer of standard free-flowing liquids as well as viscous, abrasive, or fiber-laden fluids. As one of the most reliable progressive cavity pumps for industrial processing, this single screw pc pump provides steady volumetric discharge across varying duty conditions.

Key Features

Smart Speed Control: Fitted with a mechanical stepless speed variator, this variable speed pump allows quick, effortless flow rate adjustments without requiring complex electrical control panels.
Versatile Media Handling: Outfitted with robust internal geometry, these progressive cavity pumps pump high-viscosity fluids, sludges, pastes, and media containing hard solids or fibrous materials.
Smooth & Stable Transfer: Featuring an internal-meshing rotor-stator design, this pc pump guarantees strong suction lift, uniform continuous delivery, and minimal pressure pulsation.
Cost-Effective Design: Delivers heavy-duty performance at a budget-friendly price point with straightforward maintenance, making this variable speed pump an ideal choice for economical installations.

Wide Applications

These positive displacement progressive cavity pumps suit diverse industrial environments, including wastewater treatment, petroleum processing, chemical production, food and beverage processing, brewing, papermaking, mining operations, textiles, and power generation plants. Deploying a regulated pc pump in these lines ensures smooth material movement and controlled fluid dosing.

Operating Principle

The progressive cavity pump (single screw pump) is a reliable positive displacement pump. Its core components are an eccentric screw (rotor) and a fixed rubber sleeve (stator). As the rotor turns, the media is continuously and smoothly transferred from the suction inlet to the discharge outlet.

Thanks to these features, the pump is ideal for the following applications:

Pumping high-viscosity media.
Handling fluids containing solid particles or fibers.
Requirements for continuous flow and stable pressure without pulsations.
Low-shear transfer that protects the structure of sensitive media.
Low noise operation.

Applications

As a versatile pump, the flow rate can be easily adjusted by changing the operation speed. The discharge pressure increases with the number of pump stages (0.6 MPa per stage). It is widely used in the following fields:

Environmental Protection: Industrial and domestic sewage, sludge water with solids or short fibers; ideal for oil-water separators and plate-and-frame filter presses.
Shipping & Marine: Bilge cleaning; transfer of oily water, oil sludge, and petroleum waste.
Petroleum Industry: Crude oil, oil-water mixtures, coalbed gas-water mixtures, and polymer injection.
Pharmaceuticals & Cosmetics: Various thick pastes, emulsions, and creams.
Food & Canning: Thick starch, cooking oil, honey, syrups, fruit pulp, cream, minced fish, and food processing waste.
Brewing & Distilling: Fermented mash, distillers' grains, grain residues, thick sauces, and viscous liquids with solid chunks.
Construction: Spraying and transferring cement mortar, lime slurry, coatings, and other pastes.
Mining: Pumping underground water and muddy water with solid particles from mines to the surface.
Chemical Industry: Various suspensions, greases, colloidal slurries, and adhesives.
Printing & Papermaking: High-viscosity inks, PVC paste for wallpaper, and various paper pulps or short-fiber slurries.
Boilers & Power Plants: Coal-water slurry (CWM) transfer.

Table 1: Performance Parameters at Fixed Speed

Model	Flow Rate (m³/h)	Pressure (MPa)	Max. Allowable Speed (rpm)	Motor Power (kW)	NPSHr (m)	Inlet Flange Dia. (mm)	Outlet Flange Dia. (mm)	Max. Particle Dia. (mm)	Max. Fiber Length (mm)
G20-1	0.8	0.6	960	0.75	4	25	25	1.5	25
G20-2	0.8	1.2	960	1.1	4	25	25	1.5	25
G25-1	2	0.6	960	1.5	4	32	25	2	30
G25-2	2	1.2	960	2.2	4	32	25	2	30
G30-1	5	0.6	960	2.2	4	50	40	2.5	35
G30-2	5	1.2	960	3	4	50	40	2.5	35
G35-1	8	0.6	960	3	4	65	50	3	40
G35-2	8	1.2	960	4	4	65	50	3	40
G40-1	12	0.6	960	4	4	80	65	3.8	45
G40-2	12	1.2	960	5.5	4	80	65	3.8	45
G50-1	20	0.6	960	5.5	4.5	100	80	5	50
G50-2	20	1.2	960	7.5	4.5	100	80	5	50
G60-1	30	0.6	960	11	5	125	100	6	60
G60-2	30	1.2	960	15	5	125	100	6	60
G70-1	38	0.6	720	11	5	150	125	8	70
G70-2	38	1.2	720	15	5	150	125	8	70
G85-1	60	0.6	720	18.5	5	150	150	10	80
G85-2	50	1.2	600	22	5	150	150	10	80
G105-1	80	0.6	380	22	5	200	200	15	110
G105-2	80	1.2	380	37	5	200	200	15	110
G135-1	150	0.6	380	37	5	250	250	20	150
G135-2	150	1.2	380	55	5	250	250	20	150

Table2: Single-Stage Screw Pump with Variable Speed Gearbox / Motor Drive

Model	Gear Reducer Drive (0.6MPa Working Pressure)						Variable Speed Motor Drive (Adjustable)
Model	Speed (rpm)	Flow Rate (m³/h)	Motor Spec. (kW)	Speed (rpm)	Flow Rate (m³/h)	Motor Spec. (kW)	Speed (rpm)	Flow Rate (m³/h)	Motor Power (kW)
G20-1	960	0.8	0.75-6P	480	0.4	0.55-4P / Gearbox	200~1000	0.16~0.8	0.75
	720	0.8	0.75-8P	320	0.27	0.55-4P / Gearbox
	640	0.54	0.75-4P / Gearbox	200	0.16	0.55-4P / Gearbox
G25-1	960	2	1.5-6P	480	1	1.1-4P / Gearbox	200~1000	0.41~2	1.5
	720	1.5	1.5-8P	320	0.66	0.75-4P / Gearbox
	640	1.3	1.5-4P / Gearbox	200	0.41	0.75-4P / Gearbox
G30-1	960	5	2.2-6P	480	2.5	1.5-4P / Gearbox	200~1000	1.04~5	2.2
	720	3.74	2.2-8P	320	1.66	1.1-4P / Gearbox
	640	3.33	2.2-4P / Gearbox	200	1.04	1.1-4P / Gearbox
G35-1	960	8	3-6P	480	4	2.2-4P / Gearbox	200~1000	1.66~8	3
	720	6	3-8P	320	2.66	1.5-4P / Gearbox
	640	5.33	3-4P / Gearbox	200	1.66	1.5-4P / Gearbox
G40-1	960	12	4-6P	480	6	3-4P / Gearbox	200~1000	2.5~12	4
	720	9	4-8P	320	4	2.2-4P / Gearbox
	640	8	4-4P / Gearbox	200	2.5	2.2-4P / Gearbox
G50-1	960	20	5.5-6P	480	10	4-4P / Gearbox	200~1000	4.16~20	5.5
	720	15	5.5-8P	320	6.66	3-4P / Gearbox
	640	13.3	5.5-4P / Gearbox	200	4.16	3-4P / Gearbox
G60-1	960	30	11-6P	480	15	7.5-4P / Gearbox	200~1000	6.25~30	11
	720	22.5	11-8P	320	10	5.5-4P / Gearbox
	640	20	11-4P / Gearbox	200	6.25	5.5-4P / Gearbox
G70-1	720	38	11-8P	400	21.11	11-4P / Gearbox	200~720	12.5~38	11
	600	31.2	11-4P / Gearbox	300	15.83	7.5-4P / Gearbox
	500	26.38	11-4P / Gearbox	200	10.55	7.5-4P / Gearbox
G85-1	720	60	18.5-8P	400	33.33	15-4P / Gearbox	200~720	16.66~60	18.5
	600	50	18.5-4P / Gearbox	300	25	11-4P / Gearbox
	500	41.66	15-4P / Gearbox	200	16.66	11-4P / Gearbox
G105-1	380	80	22-4P / Gearbox	200	42.1	18.5-4P / Gearbox	32~90	3~50	22
	320	67.36	22-4P / Gearbox	160	33.68	18.5-4P / Gearbox
	260	54.73	22-4P / Gearbox	100	21.05	15-4P / Gearbox
G135-1	380	120	37-4P / Gearbox	200	63.15	30-4P / Gearbox	18~180	3~56	45
	320	101	37-4P / Gearbox	160	50.52	30-4P / Gearbox
	260	82	37-4P / Gearbox	100	31.57	22-4P / Gearbox

Table3：Performance Parameters (Pressure: 1.2 MPa / Head: 120 m)

Model	Gear Reducer Drive (1.2MPa Working Pressure / 120m Head)						Variable Speed Motor Drive (Adjustable)
Model	Speed (rpm)	Flow Rate (m³/h)	Motor Spec. (kW)	Speed (rpm)	Flow Rate (m³/h)	Motor Spec. (kW)	Speed (rpm)	Flow Rate (m³/h)	Motor Power (kW)
G20-2	960	0.8	1.1-6P	480	0.4	0.75-4P / Gearbox	200~1000	0.16~0.8	1.1
	720	0.8	1.1-8P	320	0.27	0.55-4P / Gearbox
	640	0.54	1.1-4P / Gearbox	200	0.16	0.55-4P / Gearbox
G25-2	960	2	2.2-6P	480	1	1.5-4P / Gearbox	200~1000	0.41~2	2.2
	720	1.5	2.2-8P	320	0.66	1.1-4P / Gearbox
	640	1.3	2.2-4P / Gearbox	200	0.41	1.1-4P / Gearbox
G30-2	960	5	3-6P	480	2.5	2.2-4P / Gearbox	200~1000	1.04~5	3
	720	3.74	3-8P	320	1.66	1.5-4P / Gearbox
	640	3.33	3-4P / Gearbox	200	1.04	1.5-4P / Gearbox
G35-2	960	8	4-6P	480	4	3-4P / Gearbox	200~1000	1.66~8	4
	720	6	4-8P	320	2.66	2.2-4P / Gearbox
	640	5.33	4-4P / Gearbox	200	1.66	2.2-4P / Gearbox
G40-2	960	12	5.5-6P	480	6	4-4P / Gearbox	200~1000	2.5~12	5.5
	720	9	5.5-8P	320	4	3-4P / Gearbox
	640	8	5.5-4P / Gearbox	200	2.5	3-4P / Gearbox
G50-2	960	20	7.5-6P	480	10	5.5-4P / Gearbox	200~1000	4.16~20	7.5
	720	15	7.5-8P	320	6.66	4-4P / Gearbox
	640	13.3	7.5-4P / Gearbox	200	4.16	4-4P / Gearbox
G60-2	720	30	11-8P	400	16.66	7.5-4P / Gearbox	63~630	1~20	15
	600	25	11-4P / Gearbox	300	12.5	5.5-4P / Gearbox
	500	20.83	11-4P / Gearbox	200	8.33	5.5-4P / Gearbox
G70-2	720	38	15-8P	400	21.11	11-4P / Gearbox	56~560	1~22	15
	600	31.66	15-4P / Gearbox	300	15.83	11-4P / Gearbox
	500	26.38	15-4P / Gearbox	200	10.55	7.5-4P / Gearbox
G85-2	600	50	22-4P / Gearbox	300	25	15-4P / Gearbox	37~370	2~24	22
	500	41.66	22-4P / Gearbox	200	16.66	11-4P / Gearbox
	400	33.33	18.5-4P / Gearbox	100	8.33	11-4P / Gearbox
G105-2	380	80	37-4P / Gearbox	200	42.1	22-4P / Gearbox	29~290	3~50	37
	320	67.36	37-4P / Gearbox	160	33.68	22-4P / Gearbox
	260	54.73	37-4P / Gearbox	100	21.05	22-4P / Gearbox

Table4：Performance Parameters for Single & Two-Stage Screw Pumps

Pump Model	Flow Rate (m³/h)	Working Pressure (MPa)	Speed (rpm)	Gear Reducer Matched Adjustable Motor Model (kW)
G30-2	0.15~1.56	1.2	30~300	YCT160/4A-2.2
G35-2	0.25~2.5	1.2	30~300	YCT160/4A-2.2
G40-2	0.37~3.5	1.2	30~280	YCT160/4A-3
G50-1	0.58~5.83	0.6	28~280	YCT180/4A-4
G50-2	0.52~5.2	1.2	25~250	YCT200/4A-5.5
G60-1	0.78~7.81	0.6	25~250	YCT200/4A-5.5
G60-2	1.04~10.41	1.2	25~250	YCT200/4B-7.5
G70-1	1.31~11.61	0.6	25~220	YCT200/4B-7.5
G85-1	1.5~15	0.6	18~180	YCT225/4A-11
G105-1	2.94~29.47	0.6	14~140	YCT225/4B-15
G135-1	3.15~31.57	0.6	10~100	YCT250/4B-22

Q1: What is the main benefit of the stepless speed regulation function on this screw pump?

It allows operators to manually adjust the motor speed on the spot to control the liquid flow rate precisely. This means you don't need to change system piping or buy separate frequency converters (VFDs) when your production line requires different dosing speeds or handles liquids of varying thickness.

Q2: Why is adjustable speed especially important when pumping viscous or easily damaged materials?

Thicker liquids require lower speeds to prevent cavitations, while shear-sensitive materials (like food paste or polymers) can degrade if pumped too fast. By slowing down the pump speed, you protect material quality, prevent pipeline blockage, and extend the lifespan of the internal rubber sleeve.

Q3: What drives or speed control options are available for automated plant setups?

Manual Mechanical Stepless Reducer: Handwheel-operated speed control, cost-effective for static field operations.

VFD (Variable Frequency Drive) Motor: Allows remote, automated speed and flow control via PLC system signals.

Explosion-Proof Variable Speed Motor: Required for hazardous chemical areas where speed regulation is needed in flammable environments.

Q4: How does adjusting speed affect the output pressure of the pump?

No. The output pressure is mainly determined by the resistance of your pipeline and the pump's rotor-stator stage design, not the speed. Changing the speed only increases or decreases the flow volume, while the pump maintains stable, high discharge pressure even at low RPM.

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