Reference image. Final construction follows the confirmed model and quotation.
Screw Pumps
G Stepless Variable-Speed Screw Pump
Model: G
G Stepless Variable-Speed Screw Pump is designed for viscous liquids, sludge, food, paper, chemical and process transfer. DFIN Pump provides model verification, material selection and technical support based on the actual duty point.
TECHNICAL DATA
Specifications, performance and construction
Confirm the final operating point, materials, motor and connection standard before ordering.
Product Overview
G Stepless Variable-Speed Screw Pump is an industrial screw pump selected for viscous liquids, sludge, food, paper, chemical and process transfer. The final configuration should be verified against the actual liquid, duty point, temperature, installation and power supply.
Typical Applications
Viscous liquids, sludge, food, paper, chemical and process transfer.
Design Features
- Low-pulsation delivery
- Good suction capability
- Speed-proportional flow
- Model and material selection supported by DFIN Pump engineers
Technical Performance Data
| Model |
Flow (m3/h) |
pressure (Mpa) |
allow High RPM (r/min) |
Motor Power (kw) |
Necessary steam Erosion allowance (m) |
Inlet method |
Outlet method orchid path (mm) |
Allowed Diameter (mm) |
fiber allowed dimension length (mm) |
| G20-1 | 0.8 | 0.6 | 960 | 0.75 | 4 | 25 | 25 | 1.5 | 25 |
| G20-2 | 1.2 | 1.5 | |||||||
| G25-1 | 2 | 0.6 | 960 | 1.5 | 32 | 25 | 2 | 30 | |
| G25-2 | 1.2 | 2.2 | |||||||
| G30-1 | 5 | 0.6 | 960 | 2.2 | 50 | 40 | 2.5 | 35 | |
| G30-2 | 1.2 | 3 | |||||||
| G35-1 | 8 | 0.6 | 960 | 3 | 65 | 50 | 3 | 40 | |
| G35-2 | 1.2 | 4 | |||||||
| G40-1 | 12 | 0.6 | 960 | 4 | 80 | 65 | 3.8 | 45 | |
| G40-2 | 1.2 | 5.5 | |||||||
| G50-1 | 20 | 0.6 | 960 | 5.5 | 4.5 | 100 | 80 | 5 | 50 |
| G50-2 | 1.2 | 7.5 | |||||||
| G60-1 | 30 | 0.6 | 720 | 11 | 5 | 125 | 100 | 6 | 60 |
| G60-2 | 1.2 | 15 | |||||||
| G70-1 | 45 | 0.6 | 720 | 11 | 150 | 125 | 8 | 70 | |
| G70-2 | 1.2 | 18.5 | |||||||
| G85-1 | 65 | 0.6 | 630 | 15 | 150 | 150 | 10 | 80 | |
| G85-2 | 1.2 | 30 | |||||||
| G105-1 | 100 | 0.6 | 500 | 30 | 200 | 200 | 15 | 110 | |
| G105-2 | 1.2 | 55 | |||||||
| G135-1 | 150 | 0.6 | 400 | 45 | 250 | 250 | 20 | 150 | |
| G135-2 | 1.2 | 90 |
| Model | Pressure 0.3Mpa | Pressure 0.6Mpa | Adjustable number of revolutions | ||||||
| Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
|
| G20-1 | 960 | 0.96 | 0.75-6 level | 960 | 0.8 | 0.75-6 level | 125～1250 | 0.1～1.5 | 1.1 |
| 720 | 0.8 | 0.55-8 level | 720 | 0.5 | 0.75-8 level | ||||
| 510 | 0.4 | 0.55-4 level/gearbox | 510 | 0.3 | 0.75-4 level/gearbox | ||||
| G25-1 | 960 | 2.4 | 0.75-6 level | 960 | 2 | Level 1.5-6 | 125～1250 | 0.1～3 | 1.5 |
| 720 | 1.5 | 0.55-8 level | 720 | 1.27 | Level 1.1-8 | ||||
| 510 | 1.08 | 0.55-4 level/gearbox | 510 | 0.9 | 1.1-4 stage/gearbox | ||||
| G30-1 | 960 | 3.6 | Level 1.5-6 | 960 | 3 | Level 2.2-6 | 125～1250 | 0.2～4 | 2.2 |
| 720 | 2.28 | Level 1.1-8 | 720 | 1.9 | Level 1.5-8 | ||||
| 510 | 1.63 | 1.1-4 stage/gearbox | 510 | 1.35 | 1.5-4 stage/gearbox | ||||
| G35-1 | 720 | 4.8 | Level 2.2-8 | 720 | 4.04 | Level 3-8 | 125～890 | 0.3～5 | 3 |
| 510 | 3.36 | 1.5-4 stage/gearbox | 510 | 2.8 | 2.2-4 stage/gearbox | ||||
| 380 | 1.92 | 1.1-4 stage/gearbox | 380 | 1.60 | 1.5-4 stage/gearbox | ||||
| G40-1 | 510 | 6.8 | 2.2-4 stage/gearbox | 510 | 5.6 | Level 3-4/Gearbox | 125～890 | 0.3～10 | 4 |
| 380 | 5.1 | 1.5-4 stage/gearbox | 380 | 4 | 2.2-4 stage/gearbox | ||||
| 252 | 2.65 | 1.1-6 stage/gearbox | 252 | 2.2 | 1.5-6 stage/gearbox | ||||
| G50-1 | 510 | 13.8 | 4-4 stage/gearbox | 510 | 11.5 | 5.5-4 stage/gearbox | 80～750 | 1～18 | 5.5 |
| 380 | 10.2 | 4-4 stage/gearbox | 380 | 7.5 | 5.5-4 stage/gearbox | ||||
| 252 | 5.6 | Level 3-6/Gearbox | 252 | 4.4 | 5.5-6 stage/gearbox | ||||
| G60-1 | 510 | 20.8 | 7.5-4 stage/gearbox | 510 | 16 | 11-4 level/gearbox | 63～630 | 1～20 | 11 |
| 380 | 15.6 | 7.5-4 stage/gearbox | 380 | 12 | 11-4 level/gearbox | ||||
| 252 | 7.8 | 5.5-6 stage/gearbox | 252 | 6 | 7.5-6 stage/gearbox | ||||
| G70-1 | 510 | 26 | 11-4 level/gearbox | 510 | 20 | 11-4 level/gearbox | 56～560 | 1～22 | 11 |
| 380 | 17 | 7.5-4 stage/gearbox | 380 | 13 | 11-4 level/gearbox | ||||
| 252 | 9.1 | 7.5-6 stage/gearbox | 252 | 7 | 7.5-6 stage/gearbox | ||||
| G85-1 | 380 | 32 | 11-4 level/gearbox | 380 | 25 | 15-4 stage/gearbox | 37～370 | 2～24 | 15 |
| 252 | 21 | 7.5-6 stage/gearbox | 252 | 16 | Level 11-6/Gearbox | ||||
| 189 | 11 | 5.5-8 stage/gearbox | 189 | 8 | Level 11-8/Gearbox | ||||
| G105-1 | 380 | 80 | 15-4 stage/gearbox | 380 | 65 | 22-4 stage/gearbox | 29～290 | 3～50 | 22 |
| 252 | 44 | 15-6 level/gearbox | 252 | 34 | 22-6 stage/gearbox | ||||
| 189 | 29 | Level 11-8/Gearbox | 189 | 22 | Level 15-8/Gearbox | ||||
| G135-1 | 380 | 132 | 37-4 stage/gearbox | 380 | 120 | 45-4 stage/gearbox | 18～180 | 3～56 | 45 |
| 252 | 95 | Level 30-6/ gearbox | 252 | 80 | Level 37-6/ gearbox | ||||
| 189 | 65 | 18.5-6 / gearbox | 189 | 53 | Level 30-8/ gearbox | ||||
| Model | Pressure 0.8Mpa | Pressure 1.2Mpa | Adjustable number of revolutions | ||||||
| Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
Number of revolutions (r/min) |
Flow (m3/h) |
electric motor Power (kw) |
|
| G20-2 | 960 | 0.96 | Level 1.5-6 | 960 | 0.8 | Level 1.5-6 | 125～1250 | 0.1～1.5 | 1.5 |
| 720 | 0.8 | Level 1.1-8 | 720 | 0.5 | Level 1.5-8 | ||||
| 510 | 0.4 | 1.1-4 stage/gearbox | 510 | 0.3 | 1.1-4 stage/gearbox | ||||
| G25-2 | 960 | 2.4 | Level 1.5-6 | 960 | 2 | Level 2.2-6 | 125～1250 | 0.1～3 | 2.2 |
| 720 | 1.5 | Level 1.1-8 | 720 | 1.27 | Level 1.5-8 | ||||
| 510 | 1.08 | 1.1-4 stage/gearbox | 510 | 0.9 | 1.5-4 stage/gearbox | ||||
| G30-2 | 960 | 3.6 | Level 3-6 | 960 | 3 | Level 3-6 | 125～1250 | 0.2～4 | 3 |
| 720 | 2.28 | Level 1.5-8 | 720 | 1.9 | Level 2.2-8 | ||||
| 510 | 1.63 | 1.5-4 stage/gearbox | 510 | 1.35 | 2.2-4 stage/gearbox | ||||
| G35-2 | 720 | 4.8 | Level 3-8 | 720 | 4.04 | Level 4-8 | 125～890 | 0.3～5 | 4 |
| 510 | 3.36 | 2.2-4 stage/gearbox | 510 | 2.8 | Level 3-4/Gearbox | ||||
| 380 | 1.92 | 1.5-4 stage/gearbox | 380 | 1.60 | 2.2-4 stage/gearbox | ||||
| G40-2 | 510 | 6.8 | 4-4 stage/gearbox | 510 | 5.6 | 5.5-4 stage/gearbox | 125～890 | 0.3～10 | 5.5 |
| 380 | 5.1 | Level 3-4/Gearbox | 380 | 4 | 4-4 stage/gearbox | ||||
| 252 | 2.65 | 2.2-6 Class/ gearbox | 252 | 2.2 | Level 3-6/Gearbox | ||||
| G50-2 | 510 | 13.8 | 5.5-4 stage/gearbox | 510 | 11.5 | 7.5-4 stage/gearbox | 80～750 | 1～18 | 7.5 |
| 380 | 10.2 | 4-4 stage/gearbox | 380 | 7.5 | 5.5-4 stage/gearbox | ||||
| 252 | 5.6 | Level 3-6/Gearbox | 252 | 4.4 | 5.5-6 stage/gearbox | ||||
| G60-2 | 510 | 20.8 | 15-4 stage/gearbox | 510 | 16 | 15-4 stage/gearbox | 63～630 | 1～20 | 15 |
| 380 | 15.6 | 11-4 level/gearbox | 380 | 12 | 15-4 stage/gearbox | ||||
| 252 | 7.8 | 7.5-6 stage/gearbox | 252 | 6 | Level 11-6/Gearbox | ||||
| G70-2 | 510 | 26 | 15-4 stage/gearbox | 510 | 20 | 18.5-4 level/ gearbox | 56～560 | 1～22 | 18.5 |
| 380 | 17 | 11-4 level/gearbox | 380 | 13 | 15-4 stage/gearbox | ||||
| 252 | 9.1 | Level 11-6/Gearbox | 252 | 7 | Level 11-6/Gearbox | ||||
| G85-2 | 380 | 32 | 18.5-4 level/ gearbox | 380 | 25 | 22-4 stage/gearbox | 37～370 | 2～24 | 22 |
| 252 | 21 | 15-6 level/gearbox | 252 | 16 | 18.5-6 / gearbox | ||||
| 189 | 11 | Level 15-8/Gearbox | 189 | 8 | Level 15-8/Gearbox | ||||
| G105-2 | 380 | 80 | 30-4 level/ gearbox | 380 | 65 | 37-4 stage/gearbox | 29～290 | 3～50 | 37 |
| 252 | 44 | Level 30-6/ gearbox | 252 | 34 | Level 30-6/ gearbox | ||||
| 189 | 29 | Level 22-8/ gearbox | 189 | 22 | Level 22-8/ gearbox | ||||
| G135-2 | 380 | 132 | 55-4 level/ gearbox | 380 | 120 | 75-4 level/ gearbox | 18～180 | 3～56 | 75 |
| 252 | 95 | Level 55-6/ gearbox | 252 | 80 | 75-6 level/ gearbox | ||||
| 189 | 65 | Level 37-8/ gearbox | 189 | 53 | 45-8 level/ gearbox | ||||
| Type of pump |
Flow (m3/h) |
Work Pressure (Mpa) | Transfers (r/min) | Gear deceleration with Speed Motor (kw) |
| G30-2 | ～1 | 1.2 | 30～300 | YCT160/4A-2.2 |
| G35-2 | ～2 | 1.2 | 30～300 | YCT160/4A-2.2 |
| G40-2 | ～3 | 1.2 | 30～280 | YCT160/4A-3 |
| G50-1 | ～4.5 | 0.6 | 28～280 | YCT180/4A-4 |
| G50-2 | ～4.5 | 1.2 | 28～280 | YCT200/4A-5.5 |
| G60-1 | ～6.5 | 0.6 | 25～250 | YCT200/4A-5.5 |
| G60-2 | ～6.5 | 1.2 | 25～250 | YCT200/4B-7.5 |
| G70-1 | ～8 | 0.6 | 25～250 | YCT200/4B-7.5 |
| G85-1 | ～12.5 | 0.6 | 18～180 | YCT225/4A-11 |
| G105-1 | ～20 | 0.6 | 14～140 | YCT225/4B-15 |
| G135-1 | ～35 | 0.6 | 10～100 | YCT250/4B-22 |
| Rubber characteristics | Ting Jiu Rubber NBR | Chlorbutyl rubber CR | Fluorine rubber PPM | Epdm. |
| High temperature tolerance | +120°C | +110°C | +200°C | +150°C |
| Perseverance | Yu | Good. | Yu | Good. |
| Age-resilient | Good. | Good. | Yu | Yu |
| Ozone-resistant | No way. | Yu | Yu | Yu |
| Steam tolerance | Good. | No way. | Yu | Yu |
| Flammability | Good. | Yu | Yu | Yu |
| Adaptation of rubber | Epdm. | Fluorine rubber PPM | Chlorbutyl rubber CR | Ting Jiu Rubber NBR |
| Water (septic) | Good. | Good. | Good. | Good. |
| Vegetable oil | General | Good. | General | Good. |
| Mineral oil | No way. | Good. | General | Good. |
| ammonia | General | No way. | No way. | Good. |
| Aromatic solvents | No way. | Good. | No way. | No way. |
| Enriched alkalin | Good. | No way. | Good. | Good. |
| Concentrated nitric acid | No way. | General | No way. | No way. |
| - Iceacetic acid. | No way. | Good. | No way. | Good. |
| dilute sulfuric acid | Good. | Good. | No way. | Good. |
| Concentrated sulfuric acid | General | Good. | No way. | No way. |
| dilute hydrochloric acid | Good. | Good. | Good. | Good. |
| Concentrated hydrochloric acid | Good. | Good. | No way. | Good. |
| Hot water. | Good. | No way. | No way. | General |
| gasoline | No way. | Good. | General | Good. |
| Toluene | No way. | Good. | No way. | No way. |
| Dimethylbenzene | No way. | Good. | No way. | No way. |
| ethanol | Good. | Good. | Good. | General |
| kerosene | No way. | Good. | Good. | Good. |
| Diesel | No way. | Good. | No way. | Good. |
| Hydrocarbons chloride | No way. | General | No way. | No way. |
| Quantico-type material | Good. | No way. | No way. | No way. |
| Intoxicants | Good. | Good. | Good. | Good. |
| Waste-containing materials | Good. | No way. | No way. | No way. |
| Ether-like materials | Good. | No way. | No way. | No way. |
| Mud | Good. | General | General | Good. |
| Phosphate | Good. | General | Good. | General |
| Sodium carbonate | Good. | No way. | Good. | Good. |
| Salud | Good. | General | General | General |
| Benzene 100 | No way. | Good. | No way. | No way. |
| acetone | Good. | No way. | No way. | No way. |
| Nasty oil. | Good. | Good. | Good. | Good. |
| carbon disulfide | No way. | Good. | No way. | No way. |
| Fault | Reason | Troubleshooting |
| One, pump is not activated. | a. New pump turn, tweaked. b. Voltage, low current c. High-plugging media |
a. Helping to turn circles with tools and manpower b. Inspection, adjustment c. Diluent fluids |
| Two, no fluid. | a. The rotation is not in the right direction b. Inhalation pipelines are problematic c. High-plugging media d. Turn, fixed damage or damage to moving parts e. Pump internal guidance jamming |
a. Reorientation b. Check for leaks and open the Outlet valves c. Diluent fluids d. Check replacements c. Excludes replacement |
| Three, Flow can't reach. | a. Pipe leaks b. Valves are not fully open or partially blocked c. Speed's too low. d. Turn, fixed wear |
a. Inspection of repair pipes b. Open all valves, remove jamming c. Adjustments to Sped d. Replacement of other damage |
| Pressure is not reaching 4. | a. Rotation, fixed wear | a. Replacement shifts, fixed |
| Five, Motor overheat. | A. Motor malfunction b. Outlet overstretched, Motor overloaded c. Stable burn or glued to rotor |
a. Checking Motor, Voltage, current, frequency. b. Check Head, get to the Outlet valve, and clear the block. c. Replacement of damage |
| Six, Flow pressure is dropping sharply. | a. Sudden congestion or leaking of pipes b. Bad wear and tear c. Sudden change in the viscosity of the liquid d. Voltage suddenly falling |
Individual exclusions by reference |
| 7 and axle seals are full of leaks. | a. Molotovated soft fillings b. Mechanical seal damage |
a. Tightening or replacing fillings b. Repair or replacement |
Selection Information Required
Please provide medium, concentration, flow, total head or pressure, temperature, viscosity or solids, voltage, frequency and installation method. DFIN Pump will confirm the suitable model and materials.
Catalog reference: authorized YZJ product data · Model G
SELECTION SUPPORT
Application-based pump selection
Send the liquid, flow, head or pressure, temperature, solids, installation, power supply and destination for a verified recommendation.
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