Nitrogen Compressor

Nitrogen (N₂) is a colorless, odorless, tasteless inert gas with stable chemical properties. Its density is 1.2506 kg/m³ under standard conditions, and it is non-flammable and does not support combustion. It is the most widely used protective gas in industry, primarily serving as a protective atmosphere for metal heat treatment, shielding gas for electronic component welding, nitrogen flushing for food preservation, feedstock gas for synthetic ammonia in the chemical industry, purge gas for petrochemical plant displacement, protective gas in glass manufacturing, and nitrogen injection for fire prevention and extinguishing in coal mines. When selecting a nitrogen compressor, key considerations include discharge purity, oil-free lubrication level, and pressure-flow matching. Especially in high-purity nitrogen applications, any oil contamination may lead to product quality incidents.

DIAPHRAGM COMPRESSOR

PISTON COMPRESSOR

Advantages of Nitrogen Diaphragm Compressor:

01

High Purity and Zero Leakage:

The metal diaphragm is driven hydraulically to boost the gas. The cylinder requires no lubricating oil, as the diaphragm completely physically isolates the gas from the oil, ensuring an outlet purity of over 99.999%. The static sealing structure achieves zero-leakage operation, preventing contamination from external impurities while avoiding the loss of valuable nitrogen gas.
02

High Efficiency, Low Maintenance, and Adaptability to Harsh Conditions:

A high single-stage compression ratio easily achieves medium-to-high pressure output. The diaphragm assembly is the only wearing part, resulting in extremely low maintenance costs. It is particularly suitable for applications with stringent purity requirements, such as the electronics industry, specialized metallurgy, scientific research laboratories, and rare nitrogen recovery and boosting systems.

Key Design Points for Nitrogen Diaphragm Compressor:

01

Core Materials and Key Component Life:

The diaphragm is made of high-quality stainless steel with high strength and high fatigue life. Its tensile strength is 1.5 times higher than conventional materials, and its continuous operating life can reach over 6,000 hours. The oil circuit system is equipped with a precise servo pressure regulating valve, ensuring the oil pressure always follows the gas pressure changes and remains at approximately 1.1 times the gas pressure, guaranteeing uniform stress on the diaphragm.
02

Cavity Curvature and Volumetric Efficiency Optimization:

The diaphragm cavity curvatures of the cylinder head and the oil distribution plate are optimized using computer-aided design, improving volumetric efficiency by over 20%. Simultaneously, it improves the stress distribution on the diaphragm, extending its service life.
03

Safety Protection and Material Cleanliness:

Equipped with a diaphragm rupture alarm device (three-layer diaphragm structure). Once the middle diaphragm ruptures, the alarm is triggered and the unit automatically shuts down to ensure equipment and personnel safety. All wetted metal components are made of 316L stainless steel to prevent rust contamination of the gas.

Certificate

MODEL SELECTION

Model G70Z/G95Z/G110Z/G130Z	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 70Mpa	Flow Range 1~500Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water Cooled/Air Cooled

Model G70V/G95V/G130V	Piston Stroke 70mm~130mm	Maximum Piston Force 10KN~30KN
Maximum Discharge Pressure 50Mpa	Flow Range 1~200Nm³/h	Motor Power 2.2KW~30KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Model G110L/G130L	Piston Stroke 110mm~130mm	Maximum Piston Force 20KN~40KN
Maximum Discharge Pressure 100Mpa	Flow Range 10~1000Nm³/h	Motor Power 7.5KW~90KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Model G110D/G130D/G150D/ G180D/G182D/G210D	Piston Stroke 110mm~210mm	Maximum Piston Force 20KN~160KN
Maximum Discharge Pressure 100Mpa	Flow Range 30~2000Nm³/h	Motor Power 22KW~200KW
Crankshaft Speed 420rpm	Cooling Method Water-cooled / Air-cooled

Diaphragm type compressor

Piston stroke 70mm

Flow(Nm3/h)

Inlet pressure(barg)

Outlet pressure(barg)

No.	Model	Cooling water	Flow	Inlet pressure	Outlet pressure	Dimensions L×W×H	Weight	Motor Power
No.	Model	(L/h)	(Nm³/h)	(MPa)	(MPa)	(≈mm)	(≈kg)	(kW)
1	GZ-14/6-20	500	14	0.6	2	1200×800×1100	700	2.2
2	GZ-1/4-37	500	1	0.4	3.7	1200×900×1100	8500	4
3	GZ-935/8-8.3	1000	935	0.8	0.83	2100×1500×1700	2500	15
4	GV-10/4-160	800	10	0.4	16	1330×740×1080	650	4
5	GV-20/5-200	2000	20	0.5	20	2200×1800×1600	3000	15
6	GV-30/(5-6)-350	2000	30	0.5-0.6	35	2400×1800×1600	3000	18.5
7	GL-25/15	1000	25	Atmospheric	1.5	2200×1200×1300	3000	7.5
8	GL-20/12-160	1000	20	1.2	16	2200×1200×1300	3000	7.5
9	GL-70/5-35	2000	70	0.5	3.5	2000×1000×1200	3000	15
10	GD-150/2-20	4000	150	0.2	2	3400×2000×1600	3800	37
11	GD-120/8-350	6500	120	0.8	35	3500×2300×1800	4500	45
12	GD-100/5.5-200	5000	100	0.55	20	3200×2000×1500	4500	45

The equipment size and weight are for reference only, and the final design shall prevail.

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CASE STUDY

Russia
UNITED STATES
Spain
Kazakhstan

Advantages of Nitrogen Reciprocating Compressor:

01

Oil-Free Large Capacity and Wide Pressure Coverage:

An oil-free lubrication design is adopted, with no lubricating oil added between the cylinder and piston rings, fundamentally eliminating the risk of oil contamination. It offers large displacement and high volumetric efficiency, making it suitable for industrial gas stations, nitrogen pipeline boosting systems, and large-scale chemical plants with daily processing capacities ranging from thousands to tens of thousands of standard cubic meters. Multi-stage compression configurations can flexibly cover a wide range of applications from low pressure to high pressure (up to 25 MPa).
02

Mature Technology and High Cost-Effectiveness:

The technology is mature, the structure is reliable, and there is a large installed base in the industry. Spare parts supply is fast and maintenance is convenient. For industrial nitrogen applications with relatively conventional purity requirements (≥99.9%), reciprocating compressors offer excellent cost-effectiveness.

Key Design Points for Nitrogen Reciprocating Compressor:

01

Oil-Free Lubrication and Seal Design:

The cylinder adopts an oil-free lubrication design. Piston rings and rider rings use self-lubricating materials to ensure dry running life. The packing seal employs a combination of multiple oil-free sealing rings, configured with a leakage recovery channel to ensure zero external leakage.
02

Interstage Cooling and Discharge Temperature Control:

High-efficiency shell-and-tube coolers and gas-liquid separators are configured between stages to control the discharge temperature to not exceed 180°C and to separate condensate that may form during the compression process, ensuring stable unit operation.
03

Valve Optimization and Oil Migration Prevention Design:

The valve design fully considers the dry and clean characteristics of nitrogen, using low-resistance, long-life ring valves or channel valves to reduce power consumption. An intermediate partition chamber and oil scraper rings are arranged between the crankcase and the cylinder to prevent lubricating oil from the crankcase from migrating into the cylinder.

Certificate

MODEL SELECTION

Z Type

V / W Type

M Type

D Type

Piston stroke 80mm, 95mm	Piston force 10KN～25KN
Power 7.5KW-55KW	Number of cylinder banks 1/2
Crankshaft speed 740 rpm, 980 rpm	Number of compression stages 1/2/3/4
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm, 95mm, 105mm, 120mm	Piston force 25KN, 45KN, 65KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2/3/4
Crankshaft speed 740 rpm, 980 rpm	Power 15KW-220KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 45KN~660KN
Number of compression stages 1/2/3/4	Number of cylinder banks 4
Crankshaft speed 300rpm~980rpm	Power 160KW-3000KW
Drive mode Electric motor, diesel engine, natural gas engine

Piston stroke 92mm~315mm	Piston force 25KN~200KN
Number of compression stages 1/2/3/4	Number of cylinder banks 2
Crankshaft speed 300rpm~980rpm	Power 30KW-1000KW
Drive mode Electric motor, diesel engine, natural gas engine

Vertical type

Oil-free / F: Air-cooled

0.6

Actual volume flow (m3/min)

Inlet pressure(barg)

Outlet pressure(barg)

S/N	Model	Flow	Inlet pressure	Outlet pressure	Motor power
S/N	Model	(Nm³/h)	(Mpa)	(MPa)	(kW)
1	ZW-0.6/2-25	90	0.2	2.5	30
2	ZW-1.5/1-12	180	0.1	1.2	22
3	ZW-1.4/2-40	250	0.2	4	37
4	VW-7.2/2.5-6	1200	0.25	0.6	45
5	VW-15/0.5-3	1200	0.05	0.3	75
6	VW-9.7/1-10	1100	0.1	1	110
7	DW-23/9	1560	0-0.03	0.9	185
8	DW-7.6/25	500	0	2.5	132
9	DW-15.4/6	1050	0.05	0.6	110
10	MW-7/2-150	2500	0.2	15	280
11	MW-5/20-160	6000	2	16	710
12	MW-20/10-45	11000	1	4.5	1000