Name: Oil-Free Air Compressors
Brand: Ziqi Compressor

Home / Product / Oil-Free Air Compressor / Oil-Free Water-Lubricated Screw Air Compressor

Oil-free Air Compressor

The ZIQI OFW Series (Water-Lubricated) is the ultimate solution for industries demanding 100% Class 0 purity, such as pharmaceuticals, food & beverage, and electronics. Unlike traditional "dry screw" compressors that rely on fragile coatings and high temperatures, the OFW Series uses pure water for sealing and cooling. This achieves near-isothermal compression (<45°C), delivering 15% higher air volume and significantly lower maintenance costs than dry-type competitors.

Working Power

7.5 - 250 kW

Free Air Delivery

6.6 - 58.5 m³/min

Working Pressure

0.7 - 1.0 MPa (7 - 10 bar)

Transmission

Flexible Direct Drive

Cooling Method

Air-Cooling & Water-Cooling

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An oil-free air compressor is designed to deliver 100 oil free air with reliable air purity, meeting ISO 8573-1 Class 0 and other strict ISO class requirements. These oil free compressors provide high quality oil free compressed air for food and beverage processing and other industries where contamination must be avoided. Compared with traditional systems, free air compressors help reduce operating cost while maintaining consistent performance across a wide range of applications. As a dependable air compressor solution, oil-free designs support stable production, clean processes, and long-term efficiency.

Product Details Product Applications

ZIQI OFW Water-Lubricated Oil-Free Compressor

OFW Water-Lubricated Series

100% Oil-Free. Class 0 Certified. The Purest Air for Critical Industries.

Corrosion Resistant ???

Stainless Steel Air End

The compression chamber is crafted from advancedStainless Steel (304/316)or specialized Copper alloy equivalents. Designed specifically for water lubrication to prevent any risk of corrosion or rust contaminating the air.

Material: Full Stainless Steel / Polymer Composite Star Wheel
Purity: Ensures output air is absolutely clean and rust-free
Longevity: Simple single-screw structure with balanced force

High Efficiency ??

Near-Isothermal Compression

Utilizes pure water for sealing, cooling, and lubrication. The superior heat absorption of water enablesnear-isothermal compression (Temperature 50°C), which is the most efficient way to compress air.

Efficiency: Delivers ~15% more air than dry screw types
Cooling: Operating temperature remains below 50°C
Eco-Friendly: Zero oil waste disposal required

Why ZIQI Water-Lubricated Technology is the Future?

Unlike traditional dry oil-free compressors that rely on high operating temperatures (up to 200°C) to burn off contaminants, the ZIQI OFW Series uses pure water. This method not only guarantees ISO 8573-1 Class 0 air quality but also acts as a natural cleanser, washing the intake air during compression.

With no Teflon coating to peel off and no oil filters to change, the ZIQI OFW offers the lowest Total Cost of Ownership (TCO) for industries like Food & Beverage, Pharmaceuticals, and Electronics.

Technology Comparison

See why Water-Lubricated beats Traditional Dry Screw

Feature	Traditional Dry Oil-Free	ZIQI OFW (Water Lube)
Compression Temp	High ( 200°C)	Low ( 50°C Isothermal)
Air End Durability	Coating wears off (Efficiency drops)	Stainless Steel (Constant)
Maintenance Cost	High (Expensive Overhaul)	Low (Water Filter only)
Air Quality	Class 0	Class 0 + "Washed" Air

Technical Specifications

OFW Water-Lubricated Series (0.7 - 1.0 MPa)

Model	Motor Power		Air Delivery (m³/min) @ Pressure			Noise dB(A)	Dimension (LWH mm)	Weight (kg)	Outlet
Model	kW	HP	0.7 MPa	0.8 MPa	1.0 MPa	Noise dB(A)	Dimension (LWH mm)	Weight (kg)	Outlet
OFW-11A	11	15	1.35	1.25	1.10	62±2	12008001100	450	G3/4"
OFW-22A	22	30	3.60	3.50	3.10	64±2	150010001300	650	G1"
OFW-37A	37	50	6.10	5.80	5.20	66±2	180012001500	950	G1-1/2"
OFW-55A/W	55	75	9.50	9.00	8.20	68±2	200013501600	1200	DN50
OFW-75A/W	75	100	13.5	12.8	11.5	70±2	220014501700	1600	DN65
OFW-90A/W	90	120	16.5	15.2	13.8	72±2	240016001800	2100	DN65
OFW-110A/W	110	150	20.5	19.0	17.0	72±2	260017001900	2500	DN80
OFW-132A/W	132	180	24.5	23.0	20.5	74±2	280018002000	3200	DN80

* Note: "A" denotes Air-cooling, "W" denotes Water-cooling available. Requires purified water supply.

Lubrication: 100% Oil-Free Water Lubricated

Driving Method: Direct Driven

Voltage: 380V/3Ph/50Hz (Customizable)

Model	Max Exhaust Pressure			Air Displacement		Motor Power		Dimension (mm) (L × W × H)	Weight (kg)	Noise dB(A)	Outlet
Model	MPa	bar	psi	m3/min	cfm	kW	HP	Dimension (mm) (L × W × H)	Weight (kg)	Noise dB(A)	Outlet
?? Air Cooling Series (OF-A)
OF-11A	0.7	7	102	1.6	56	11	15	1100×800×1000	500	58±2	G1"
	0.8	8	116	1.5	53
	1.0	10	145	1.3	46
OF-15A	0.8	8	116	1.8	64	15	20	1130×900×1040	550	60±2	G1"
OF-18.5A	0.7	7	102	3.1	109	18.5	25	1400×1000×1200	600	61±2	G1"
	0.8	8	116	2.8	99
	1.0	10	145	2.5	88
OF-22A	0.7	7	102	3.7	131	22	30	1400×1000×1200	655	61±2	G1"
	0.8	8	116	3.4	120
	1.0	10	145	3.0	106
OF-30A	0.7	7	102	5.2	184	30	40	1920×1170×1320	1150	64±2	G1-1/2"
	0.8	8	116	4.7	166
	1.0	10	145	4.3	152
OF-37A	0.7	7	102	6.1	215	37	50	1920×1170×1320	1200	64±2	G1-1/2"
	0.8	8	116	5.6	198
	1.0	10	145	5.0	177
OF-45A	0.7	7	102	7.5	265	45	60	1920×1170×1320	1320	66±2	G2"
	0.8	8	116	6.8	240
	1.0	10	145	6.0	212
?? Water Cooling Series (OF-W)
OF-55W	0.7	7	102	10.0	353	55	75	1930×1320×1535	1520	66±2	G2"
	0.8	8	116	9.0	318
	1.0	10	145	7.8	275
OF-75W	0.7	7	102	13.0	459	75	100	1930×1320×1535	1620	70±2	G2"
	0.8	8	116	12.0	424
	1.0	10	145	10.0	353
OF-90W	0.7	7	102	15.5	547	90	120	1930×1320×1535	1800	70±2	DN80
	0.8	8	116	14.0	494
	1.0	10	145	12.5	441
OF-110W	0.8	8	116	20.0	706	110	150	2150×1600×1680	3100	72±2	DN80
	1.0	10	145	18.0	636
	1.3	13	189	16.0	565
OF-132W	0.7	7	102	25.0	883	132	175	2150×1600×1680	3250	72±2	DN80
	0.8	8	116	23.0	812
	1.0	10	145	20.0	706
OF-160W	0.7	7	102	27.0	953	160	215	2860×1500×1750	4500	72±2	DN100
	0.8	8	116	25.5	900
	1.0	10	145	24.0	847
OF-185W	0.7	7	102	30.0	1059	185	250	2860×1500×1750	4500	74±2	DN100
	0.8	8	116	28.0	989
	1.0	10	145	25.0	883
OF-250W	0.7	7	102	43.0	1518	250	340	3320×1600×1840	5200	74±2	DN100
	0.8	8	116	41.0	1448
	1.0	10	145	38.0	1342

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