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Ultra-Silent Circular Arc Gear Pumps

US Series Ultra-Silent Circular Arc Gear Pumps

Noah's US series ultra-silent circular arc gear pumps are industrial hydraulic power components designed for applications requiring low noise, high efficiency, and long lifespan. This series of pumps utilizes helical gear meshing technology and an optimized flow channel design, significantly reducing pressure pulsation and operational noise, while maintaining high volumetric efficiency and reliability. They are widely applied in noise-sensitive precision equipment, medical machinery, automated production lines, and similar scenarios.

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Available Models
  • US28
  • US33
  • US38
  • US47
  • US55
  • US72
US28: Shaft and Flange Types and Dimensions
  • Pump Model: US28
  • Grade: 2V
  • Port: G-U
  • Weight: 2kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
F1AC3
F1AC3
 4 42 6 101 445 275 280 300 55
6 64 92 1,065 473 275 280 300 55
8 83 12 1,115 498 246 260 280 55
10 102 147 1,165 523 222 250 270 55
13 129 186 1,234 557 176 230 250 55
F1AC3
F1AC3
 4 42 6 101 445 275 280 300 55
6 64 92 1,065 473 275 280 300 55
8 83 12 1,115 498 246 260 280 55
10 102 147 1,165 523 222 250 270 55
13 129 186 1,234 557 176 230 250 55
F1P AC2
F1P AC2
 4 42 60 101 445 240 260 280 55
6 64 92 1,065 473 230 240 270 55
8 83 12 1,115 498 200 210 220 55
10 102 147 1,165 523 160 170 180 55
13 129 186 1,234 557 140 150 160 55
F1KAG54
F1KAG54
 4 42 6 101 445 275 280 300 55
6 64 92 1,065 473 230 240 270 55
8 83 12 1,115 498 180 200 210 55
10 102 147 1,165 523 150 160 170 55
13 129 186 1,234 557 120 130 140 55
F1K AGL54
F1K AGL54
 4 42 6 101 445 275 280 300 55
6 64 92 1,065 473 260 275 290 55
8 83 12 1,115 498 230 240 250 55
10 102 147 1,165 523 180 190 200 55
13 129 186 1,234 557 150 160 170 55
F1KAGL544
F1KAGL544
 4 42 6 114 445 275 280 300 55
6 64 92 1,195 473 260 275 290 55
8 83 12 1,245 498 230 240 250 55
10 102 147 1,295 523 180 190 200 55
13 129 186 1,364 557 150 160 170 55
FSAEAAAC
FSAEAAAC
 4 42 6 107 505 234 238 255 55
6 64 92 1,125 533 234 238 255 55
8 83 12 1,175 558 209 221 238 55
10 102 147 1,225 583 189 213 230 55
13 129 186 1,294 617 170 196 213 55
FSAEAAAC4
FSAEAAAC4
 4 42 6 120 505 234 238 255 55
6 64 92 1,255 533 234 238 255 55
8 83 12 1,305 558 209 221 238 55
10 102 147 1,355 583 189 213 230 55
13 129 186 1,424 617 170 196 213 55
F1LAGL54
F1LAGL54
 4 42 6 101 99 275 280 300 55
6 64 92 1,065 1,045 260 275 290 55
8 83 12 1,115 1,095 230 240 250 55
10 102 147 1,165 1,145 180 190 200 55
13 129 186 1,234 1,214 150 160 170 55
F1LAG54
F1LAG54
 4 42 6 101 99 275 280 300 55
6 64 92 1,065 1,045 230 240 270 55
8 83 12 1,115 1,095 180 200 210 55
10 102 147 1,165 1,145 150 160 170 55
13 129 186 1,234 1,214 120 130 140 55
US33: Shaft and Flange Types and Dimensions
  • Pump Model: US33
  • Grade: 2C
  • Port: Q-G-U
  • Weight: 5kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
F2 AC4
F2AC4
 10 101 145 1,045 468 275 280 300 55
13 126 181 1,094 492 265 270 290 55
15 152 218 1,144 517 241 250 270 55
18 182 261 1,202 546 206 250 270 55
F2BK7 AG
F2BK7AG
 10 101 145 1,045 468 275 280 300 55
13 126 181 1,094 492 265 270 290 55
15 152 218 1,144 517 241 250 270 55
18 182 261 1,202 546 206 250 270 55
FSAEA AC
FSAEAAC
 10 101 145 1,045 468 275 280 300 55
13 126 181 1,094 492 265 270 290 55
15 152 218 1,144 517 241 250 270 55
18 182 261 1,202 546 206 250 270 55
FSAEA AT9
FSAEAAT9
 10 101 145 1,045 468 275 280 300 55
13 126 181 1,094 492 265 270 290 55
15 152 218 1,144 517 241 250 270 55
18 182 261 1,202 546 206 250 270 55
US38: Shaft and Flange Types and Dimensions
  • Pump Model: US38
  • Grade: 2C
  • Port: Q-G-U
  • Weight: 6kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
F2 AC4
F2 AC4
 16 159 228 108 485 265 280 300 55
18 179 258 111 50 247 260 280 55
20 20 288 114 515 230 250 270 55
22 221 318 117 53 222 240 260 55
25 252 362 1,215 553 200 210 220 55
28 283 407 126 575 180 190 200 55
F2BK7 AG
F2BK7AG
 16 159 228 108 485 265 280 300 55
18 179 258 111 50 247 260 280 55
20 20 288 114 515 230 250 260 55
22 221 318 117 53 210 230 240 55
25 252 362 1,215 553 200 210 220 55
28 283 407 126 575 180 190 200 55
FSAEAAC
FSAEAAC
 16 159 228 108 485 265 280 300 55
18 179 258 111 50 247 260 280 55
20 20 288 114 515 230 250 270 55
22 221 318 117 53 222 240 260 55
25 252 362 1,215 553 200 210 220 55
28 283 407 126 575 180 190 200 55
FSAEAAT9
FSAEAAT9
 16 159 228 108 485 265 280 300 55
18 179 258 111 50 247 260 280 55
20 20 288 114 515 230 250 270 55
22 221 318 117 53 222 240 260 55
25 252 362 1,215 553 200 210 220 55
28 283 407 126 575 180 190 200 55
FSAEA AT11
FSAEAAT11
 16 159 228 108 485 265 280 300 55
18 179 258 111 50 247 260 280 55
20 20 288 114 515 230 250 270 55
22 221 318 117 53 222 250 270 55
25 252 362 1,215 553 208 250 270 55
28 283 407 126 575 197 250 270 55
US47: Shaft and Flange Types and Dimensions
  • Pump Model: US47
  • Grade: 2C
  • Port: Q-G-U
  • Weight: 10kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
F3 AC9
F3AC9
 28 280 403 1,395 615 270 280 300 57
32 322 463 1,435 635 252 270 280 57
36 363 523 1,475 655 239 250 270 57
40 405 583 1,515 675 225 250 270 57
45 455 650 156 698 213 250 270 57
50 503 724 161 723 202 250 270 57
FSAEB AC
FSAEBAC
 28 280 403 1,395 615 270 280 300 57
32 322 463 1,435 635 252 270 280 57
36 363 523 1,475 655 239 250 270 57
40 405 583 1,515 675 225 250 270 57
45 455 650 156 698 213 250 270 57
50 503 724 161 723 202 250 270 57
FSAEB AT13
FSAEBAT13
 28 280 403 1,395 615 270 280 300 57
32 322 463 1,435 635 252 270 280 57
36 363 523 1,475 655 239 250 270 57
40 405 583 1,515 675 225 250 270 57
45 455 650 156 698 213 250 270 57
50 503 724 161 723 202 250 270 57
US55: Shaft and Flange Types and Dimensions
  • Pump Model: US55
  • Grade: 2V
  • Port: G-U
  • Weight: 2kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
50 505 727 1,795 8,150 275 280 300 57
63 635 914 1,885 8,600 249 260 280 57
75 750 1,081 1,965 9,000 229 250 270 57
90 909 1,309 2,075 955 178 240 260 57
  • Pump Model: US55
  • Grade: 2V
  • Port: G-U
  • Weight: 2kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Dimension C (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
0 OE
50 505 727 1,570 705 70,5 70,5 275 280 300 57
63 635 914 1,660 750 785 750 249 260 280 57
75 750 1,081 1,740 790 825 790 229 250 270 57
90 909 1,309 1,850 845 88,0 84,5 178 240 260 57
US72: Shaft and Flange Types and Dimensions
  • Pump Model: US72
  • Grade: 2V
  • Port: ME
  • Weight: 30kg
Flange & Drive Shaft Type Displacement (cc/rev) Flow (L/min) Dimension A (mm) Dimension B (mm) Dimension C (mm) Continuous pressure (bar) Intermittent pressure (bar) Peak pressure (bar) Noise level (dBA)
FSAEDAC
FSAED AC
 94 941 136 245 1,255 1,285 240 250 260 57
101 1,014 147 248 127 134 230 240 250 57
125 1,255 181 258 132 145 220 220 230 57
150 1,509 218 2,685 1,373 1,503 200 210 220 57
175 175 253 2,785 1,423 1,553 180 190 200 57
200 2,004 290 289 1,475 1,605 160 170 180 57
FSAED AT23
FSAED AT23
 94 941 136 245 1,255 1,285 240 250 260 57
101 1,014 147 248 127 134 230 240 250 57
125 1,255 181 258 132 145 220 220 230 57
150 1,509 218 2,685 1,373 1,503 200 210 220 57
175 175 253 2,785 1,423 1,553 180 190 200 57
200 2,004 290 289 1,475 1,605 160 170 180 57
Core Design Highlights
  • Ultra-Silent Technology
    1. Helical gear meshing: The gears feature a spiral angle design for progressive meshing, which reduces impact vibration, resulting in noise levels as low as 55-60 dB(A) (compared to approximately 70 dB(A) for similar straight-tooth gear pumps).
    2. Pressure pulsation suppression: Patented flow channel structure and optimized oil suction area reduce pressure pulsation to ≤±1.5%.
  • High Efficiency and Energy Saving
    1. High volumetric efficiency: Precision gear processing and low-clearance sealing technology minimize internal leakage.
    2. Wide viscosity adaptability: Supports ISO VG 15-680 hydraulic oils and operates within a temperature range of -20℃ to 100℃.
  • Long Lifespan Design
    1. Wear-resistant gear set: Carburized and quenched alloy steel gears with a surface hardness of ≥60HRC provide a lifespan of ≥20,000 hours.
    2. Integrated bearings: Maintenance-free needle roller bearings enhance resistance to impact loads by 30%.
Structural Composition
  • Pump body: High-strength aluminum alloy (lightweight) or cast iron (heavy-duty type), with built-in silencing chambers and oil suction buffer structures.
  • Helical gear set: Precision-ground helical gears with a helix angle of 20°-30° and polished tooth surfaces.
  • Side plates/end covers: Copper alloy or DU composite materials, reducing friction and axial clearance leakage.
  • Sealing system: Double-lip shaft seal (skeletal oil seal) with IP65 protection rating, supporting mineral, synthetic, and biodegradable oils.
  • Drive shaft: 42CrMo alloy steel, heat-treated, with optional keyway, spline, or coupling connections.
Application Areas
  • Medical equipment: Operating table lift systems, CT/MRI equipment hydraulic drives (for noise-sensitive environments).
  • Precision machine tools: High-precision grinding machines, CNC machining center coolant circulation systems.
  • Environmental protection machinery: Waste treatment equipment, sewage treatment pump stations (compatible with biodegradable oils).
  • Automated production lines: Robot joint drives, assembly line fixture control.
  • Mobile equipment: New energy construction machinery, electric forklift silent hydraulic systems.

No. Our silent gear pump utilizes helical gear progressive meshing technology, with operational noise as low as 55-60 dB(A), making it particularly suitable for noise-sensitive surgical rooms and medical environments.

Yes, it is suitable. This series of pumps features a compact structure and small size, making it easy to install in confined spaces. Its silent noise reduction design makes it very suitable for equipment environments like MRI and CT, which have strict space and noise requirements.

It is very suitable. The silent gear pump boasts very high volumetric efficiency, wide adaptability to various viscosity media, and a broad temperature operating range, making it an ideal power source for cooling and lubrication systems in high-precision CNC equipment.

Our silent gear pump features high starting torque response and high volumetric efficiency, making it particularly suitable for low-noise, high-response scenarios such as electric forklifts and AGVs. Its drive shaft types, including keyway, spline, and coupling connections, allow it to flexibly match various mainstream hydraulic motors and servo motors.
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