US Series Ultra-Silent Circular Arc Gear Pumps

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Website: http://hydraulicparts-en.com/1-2-ultra-silent-circular-arc-gear-pumps.html

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.

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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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: FSAEB AC

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: FSAEB AT15

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)
Flange & Drive Shaft Type	Displacement (cc/rev)	Flow (L/min)	Dimension A (mm)	Dimension B (mm)	0	OE	Continuous pressure (bar)	Intermittent pressure (bar)	Peak pressure (bar)	Noise level (dBA)
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	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	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

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).
Pressure pulsation suppression: Patented flow channel structure and optimized oil suction area reduce pressure pulsation to ≤±1.5%.

High Efficiency and Energy Saving

High volumetric efficiency: Precision gear processing and low-clearance sealing technology minimize internal leakage.
Wide viscosity adaptability: Supports ISO VG 15-680 hydraulic oils and operates within a temperature range of -20℃ to 100℃.

Long Lifespan Design

Wear-resistant gear set: Carburized and quenched alloy steel gears with a surface hardness of ≥60HRC provide a lifespan of ≥20,000 hours.
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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