{"id":574,"date":"2026-07-20T07:28:34","date_gmt":"2026-07-20T07:28:34","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=574"},"modified":"2026-07-20T07:28:35","modified_gmt":"2026-07-20T07:28:35","slug":"zw-3-1-520-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/ur\/product\/zw-3-1-520-nitrogen-compressor\/","title":{"rendered":"ZW-3.1\/5~20 Nitrogen Compressor \u2013 Variable-Pressure Oil-Free N2 Booster for Flexible Industrial Applications"},"content":{"rendered":"
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ZW-3.1\/5~20 Nitrogen Compressor \u2013 Variable-Pressure Oil-Free N2 Booster for Flexible Industrial Applications<\/h1>\n

Engineered to deliver 3.1 m\u00b3\/min across a wide pressure range of 0.50\u20132.00 MPa, the ZW-3.1\/5~20 is a two-stage, two-row oil-free piston nitrogen compressor designed for pilot plants, R&D facilities, and small-scale industrial processes requiring adjustable discharge pressure. Zero lubricant contamination, compact footprint, and optimized for versatile nitrogen supply.<\/p>\n

\u0627\u06cc\u06a9 \u0627\u0642\u062a\u0628\u0627\u0633 \u06a9\u06cc \u062f\u0631\u062e\u0648\u0627\u0633\u062a \u06a9\u0631\u06cc\u06ba\u06d4<\/a>
\nView N2 Compressor Series<\/a><\/div>\n

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Product Overview<\/h2>\n

\u062f\u06cc ZW-3.1\/5~20 nitrogen compressor<\/strong> represents a uniquely versatile solution within our oil-free piston compressor family, distinguished by its variable discharge pressure capability spanning 0.50 MPa to 2.00 MPa<\/strong>. This pressure flexibility makes the ZW-3.1\/5~20 ideally suited for pilot plant operations, research and development facilities, and small-scale industrial processes where nitrogen demand characteristics change frequently or where a single compressor must serve multiple applications with differing pressure requirements.<\/p>\n

With a rated capacity of 3.1 m\u00b3\/min<\/strong> at 0.50 MPa inlet pressure, this compact unit delivers oil-free nitrogen compression through a proprietary self-lubricating PTFE composite piston ring and rider band system<\/strong>. The absence of hydrocarbon lubricants in the compression path ensures ISO 8573-1 Class 0 oil content certification<\/strong> natively, making the unit immediately suitable for laboratory-grade nitrogen, pharmaceutical process development, and electronics prototyping without additional downstream purification equipment.<\/p>\n

The compressor follows a two-stage, two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/strong> configuration with an exceptionally compact footprint of 2250 \u00d7 1296 \u00d7 2200 mm<\/strong> and a dry weight of only 2.60 tonnes<\/strong>. The two-row opposed-cylinder design inherently cancels first-order inertial forces, permitting installation on a modest foundation without specialized vibration isolation infrastructure. The standard 380V, 75 kW motor<\/strong> integrates directly into existing low-voltage industrial distribution systems, eliminating the need for medium-voltage switchgear.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n<\/div>\n

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Technical Specifications \u2013 ZW-3.1\/5~20<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u067e\u06cc\u0631\u0627\u0645\u06cc\u0679\u0631<\/th>\nValue<\/th>\nUnit<\/th>\n<\/tr>\n<\/thead>\n
\u0645\u0627\u0688\u0644<\/td>\nZW-3.1\/5~20<\/td>\n\u2013<\/td>\n<\/tr>\n
\u067e\u06cc\u0679\u0631\u0646<\/td>\nTwo-stage, Two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
\u0635\u0644\u0627\u062d\u06cc\u062a<\/td>\n3.1 (at 0.50 MPa inlet)<\/td>\nm\u00b3\/\u0645\u0646\u0679<\/td>\n<\/tr>\n
Discharge Pressure Range<\/td>\n0.50 \u2013 2.00<\/td>\n\u0627\u06cc\u0645 \u067e\u06cc \u0627\u06d2<\/td>\n<\/tr>\n
Compressor Size (L \u00d7 W \u00d7 H)<\/td>\n2250 \u00d7 1296 \u00d7 2200<\/td>\nmm<\/td>\n<\/tr>\n
\u0648\u0632\u0646<\/td>\n2.60<\/td>\nt<\/td>\n<\/tr>\n
\u0637\u0627\u0642\u062a<\/td>\n75<\/td>\n\u06a9\u0644\u0648 \u0648\u0627\u0679<\/td>\n<\/tr>\n
\u0648\u0648\u0644\u0679\u06cc\u062c<\/td>\n380<\/td>\nV<\/td>\n<\/tr>\n
\u06af\u06cc\u0633 \u0645\u06cc\u0688\u06cc\u0645<\/td>\nNitrogen (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrication<\/td>\n\u062a\u06cc\u0644 \u0633\u06d2 \u067e\u0627\u06a9<\/td>\n\u2013<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* Capacity is rated at 0.50 MPa inlet pressure. Actual capacity varies with inlet pressure and discharge pressure settings. All specifications are rated at standard reference conditions (ISO 1217, Annex C). Actual performance may vary based on site altitude, ambient temperature, and operating conditions.<\/em><\/p>\n<\/div>\n

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Key Features & Engineering Advantages<\/h2>\n

1. Variable Discharge Pressure for Multi-Application Flexibility<\/h3>\n

The defining characteristic of the ZW-3.1\/5~20 is its adjustable discharge pressure range from 0.50 MPa to 2.00 MPa<\/strong>. This versatility is achieved through a combination of adjustable suction valve unloaders, variable clearance pocket control, and a robust two-stage compression architecture that can accommodate a wide range of pressure ratios. For pilot plant operators and R&D facilities, this means a single compressor can serve multiple process requirements\u2014low-pressure inerting at 0.50 MPa during one campaign, medium-pressure reactor blanketing at 1.20 MPa during another, and high-pressure gas transfer at 2.00 MPa during a third\u2014without requiring separate compressor investments or time-consuming equipment changeovers.<\/p>\n

2. Oil-Free PTFE Composite Sealing Technology<\/h3>\n

The ZW-3.1\/5~20 employs a proprietary self-lubricating piston ring and rider band assembly<\/strong> manufactured from high-performance PTFE composites reinforced with glass fiber and bronze particulates. These rings operate with a coefficient of friction below 0.08 without any external hydrocarbon lubrication, delivering ISO 8573-1 Class 0 oil content<\/strong> in the compressed nitrogen stream. For research laboratories, pharmaceutical pilot plants, and electronics development facilities, this native oil-free certification eliminates the need for downstream oil-filtration equipment, reducing both capital expenditure and ongoing maintenance complexity. The PTFE formulation is specifically engineered for the variable thermal conditions associated with adjustable pressure operation.<\/p>\n

3. Compact Two-Stage Architecture with Intercooling<\/h3>\n

\u062f\u06cc two-stage, two-row compression layout<\/strong> divides the pressure ratio between a low-pressure cylinder and a high-pressure cylinder, with an inter-stage shell-and-tube cooler removing the heat of compression. This staged approach is particularly critical for the ZW-3.1\/5~20 given its wide pressure range, as it limits the maximum discharge temperature per stage even at the highest pressure setting (2.00 MPa). The intercooler maintains gas temperatures below 160\u00b0C across the full operating envelope, preserving PTFE ring integrity and extending valve plate service life. The two-row opposed-cylinder arrangement also provides inherent first-order force balance, reducing vibration transmission and permitting installation on a lighter foundation.<\/p>\n

4. Standard 380V Direct Drive for Easy Integration<\/h3>\n

The ZW-3.1\/5~20 is driven by a 75 kW, 380V, 50Hz three-phase induction motor<\/strong> conforming to IEC 60034-1 efficiency class IE3. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage infrastructure, step-down transformers, or specialized switchgear. This electrical simplicity is particularly advantageous for pilot plants and R&D facilities that may lack medium-voltage electrical infrastructure. The modest 75 kW power draw also minimizes demand charges and simplifies electrical permitting in facilities with limited power capacity.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n<\/div>\n

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Application Scenarios<\/h2>\n

Pilot Plant & Process Development<\/h3>\n

Chemical and pharmaceutical pilot plants frequently require nitrogen at varying pressures depending on the process campaign. The ZW-3.1\/5~20 variable-pressure nitrogen compressor<\/a> can supply low-pressure inerting (0.50\u20130.80 MPa) for reactor filling and emptying operations, medium-pressure blanketing (1.00\u20131.50 MPa) for stirred-tank reactors, and high-pressure gas transfer (1.80\u20132.00 MPa) for catalyst loading and filter press operations. This multi-pressure capability eliminates the need for multiple compressors or pressure-reducing stations, reducing both capital investment and plant footprint.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n

Research & Development Laboratories<\/h3>\n

University research laboratories, government research institutes, and corporate R&D centers require versatile nitrogen supplies for diverse experimental programs. The ZW-3.1\/5~20 can provide low-pressure nitrogen (0.50 MPa) for glove box inerting and Schlenk line operations, medium-pressure nitrogen (1.00\u20131.50 MPa) for high-pressure reaction vessels and autoclaves, and high-pressure nitrogen (2.00 MPa) for gas chromatography carrier gas and mass spectrometry ionization sources. The oil-free certification ensures that nitrogen purity meets the stringent requirements of analytical instrumentation without additional purification.<\/p>\n

Small-Scale VPSA Nitrogen Boosting<\/h3>\n

Small VPSA nitrogen generators (5\u201315 Nm\u00b3\/h capacity) produce nitrogen at near-atmospheric pressure. The ZW-3.1\/5~20 boosts this low-pressure product to the pressure required by the specific application, with the flexibility to adjust output pressure as demand changes. This is particularly valuable for facilities that serve multiple nitrogen consumers with different pressure requirements, such as a combination of low-pressure storage tank blanketing and high-pressure process vessel inerting.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n

Electronics Prototyping & Semiconductor Development<\/h3>\n

Electronics prototyping facilities and semiconductor development labs require nitrogen for reflow oven atmosphere control, wire bonding inerting, and component storage dry cabinets<\/strong>. The ZW-3.1\/5~20’s variable pressure capability allows it to serve both low-pressure reflow ovens (0.50\u20130.80 MPa) and high-pressure wire bonding equipment (1.50\u20132.00 MPa) from a single source. The oil-free design is absolutely critical in electronics applications because even trace oil contamination can cause solder joint defects, conformal coating adhesion failures, and contamination of sensitive optical and MEMS components.<\/p>\n<\/div>\n

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Material & Construction<\/h2>\n

The ZW-3.1\/5~20 is constructed from materials selected for nitrogen compatibility, variable-pressure service, and long-term reliability:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Component<\/th>\n\u0645\u0648\u0627\u062f<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Block<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, integral cooling passages<\/td>\n<\/tr>\n
Crankshaft<\/td>\nForged Alloy Steel<\/td>\n42CrMo4, Q&T, dynamically balanced<\/td>\n<\/tr>\n
Piston Rings<\/td>\nPTFE-Glass-Bronze Composite<\/td>\nSelf-lubricating, variable-pressure rated<\/td>\n<\/tr>\n
Rider Bands<\/td>\nPTFE Composite<\/td>\nPiston guidance, anti-scuffing<\/td>\n<\/tr>\n
Valve Plates<\/td>\n\u0633\u0679\u06cc\u0646\u0644\u06cc\u0633 \u0633\u0679\u06cc\u0644<\/td>\nSS316, concentric ring spring-loaded<\/td>\n<\/tr>\n
Intercooler<\/td>\nCarbon Steel Shell \/ SS304 Tubes<\/td>\nASME VIII Div.1, 1.5\u00d7 hydrotest<\/td>\n<\/tr>\n
Aftercooler<\/td>\nCarbon Steel Shell \/ SS304 Tubes<\/td>\nFinned tube, 32\u00b0C cooling water rated<\/td>\n<\/tr>\n
Base Frame<\/td>\nStructural Steel<\/td>\nWelded, vibration-damped mounting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

All pressure-bearing components conform to ASME BPVC Section VIII Division 1<\/strong> or Chinese GB 150 standards. Weld joints undergo 100% radiographic inspection (RT), and each pressure vessel is hydrostatically tested at 1.5\u00d7 MAWP for a minimum 30-minute hold period.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n<\/div>\n

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Installation & Maintenance Guidelines<\/h2>\n

Foundation & Spatial Requirements<\/h3>\n

The ZW-3.1\/5~20 weighs 2.60 tonnes and features a compact vertical design with a low center of gravity. A reinforced concrete pad of 4\u20135 tonnes<\/strong> is sufficient for stable operation, mounted on standard elastomeric vibration isolators (natural frequency 8\u201312 Hz). The two-row opposed-cylinder arrangement inherently cancels first-order inertial forces, minimizing vibration transmission. Required clearances: 1.0 m on the non-drive side for valve access, 0.8 m on the drive side for motor maintenance, and 1.5 m overhead for routine service. The compact footprint allows installation in existing machinery rooms, containerized units, or mobile skids.<\/p>\n

Cooling Water Specifications<\/h3>\n

Cooling water demand is approximately 15 m\u00b3\/h<\/strong> at an inlet temperature not exceeding 32\u00b0C. The water circuit supplies the cylinder jackets and intercooler in parallel. Water quality: pH 6.5\u20138.5, total hardness < 300 mg\/L as CaCO\u2083, chloride < 50 mg\/L, suspended solids < 30 mg\/L. For installations without reliable municipal water, a compact closed-loop cooling tower with a 0.5 m\u00b3 buffer tank is recommended.<\/p>\n

Maintenance Intervals<\/h3>\n
\n\n\n\n\n\n\n\n\n\n
Interval<\/th>\nService Item<\/th>\nAction Required<\/th>\n<\/tr>\n<\/thead>\n
Daily<\/td>\nVisual & Operational Check<\/td>\nInspect for leaks, abnormal noise, cooling water flow<\/td>\n<\/tr>\n
250 hours<\/td>\nValve Plate Inspection<\/td>\nCheck for carbon deposits, spring fatigue, or cracking<\/td>\n<\/tr>\n
1,000 hours<\/td>\nPiston Ring Wear Assessment<\/td>\nMeasure groove clearance; replace if > 0.20 mm<\/td>\n<\/tr>\n
4,000 hours<\/td>\nIntermediate Service<\/td>\nReplace piston rings, rider bands, and valve assemblies<\/td>\n<\/tr>\n
8,000 hours<\/td>\nMajor Overhaul<\/td>\nInspect crankshaft, measure bearing clearances<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design eliminates oil changes, filter replacements, and separator maintenance. The only consumable wear items are the PTFE piston rings and rider bands<\/strong>, typically achieving 4,000\u20136,000 hours under clean nitrogen conditions.<\/p>\n

\"ZW-3.1\/5~20<\/p>\n<\/div>\n

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Compliance & Safety Certifications<\/h2>\n

The ZW-3.1\/5~20 meets the following international standards:<\/p>\n

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Pressure Equipment<\/strong>
\nASME BPVC Section VIII Div.1, GB 150-2011, PED 2014\/68\/EU Module A<\/span><\/div>\n
Electrical & Machine Safety<\/strong>
\nIEC 60034-1 (IE3 efficiency), IEC 60204-1, ISO 12100<\/span><\/div>\n
Oil-Free Certification<\/strong>
\nISO 8573-1 Class 0 (Oil Content), T\u00dcV Rheinland tested<\/span><\/div>\n
Quality & Environmental<\/strong>
\nISO 9001:2015, ISO 14001:2015<\/span><\/div>\n<\/div>\n
\u26a0\ufe0f Safety Notice<\/strong><\/p>\n

Nitrogen is an odorless asphyxiant gas. All installations must include continuous oxygen monitoring in the compressor room. Ventilation must maintain oxygen above 19.5% per OSHA 29 CFR 1910.146. Alarm at 19.5% O\u2082, hard shutdown at 18.0% O\u2082. Personnel entry requires portable O\u2082 monitors and buddy system.<\/p>\n<\/div>\n

\"ZW-3.1\/5~20<\/p>\n<\/div>\n

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Performance & Efficiency Analysis<\/h2>\n

The ZW-3.1\/5~20 achieves a specific power consumption that varies with discharge pressure setting, ranging from approximately 24.2 kW\/m\u00b3\/min at 0.50 MPa<\/strong> \u06a9\u0648 24.2 kW\/m\u00b3\/min at 2.00 MPa<\/strong> (based on 75 kW power draw and 3.1 m\u00b3\/min capacity). While the specific power is higher than larger compressors due to reduced scale efficiency, the ZW-3.1\/5~20’s primary value proposition is its versatility<\/strong>\u2014the ability to replace multiple single-pressure compressors with one adjustable unit.<\/p>\n

For facilities that would otherwise require separate compressors for low-pressure (0.50 MPa), medium-pressure (1.20 MPa), and high-pressure (2.00 MPa) service, the ZW-3.1\/5~20 eliminates the capital cost of two additional compressors, the associated piping and instrumentation, and the floor space they would occupy. The total cost of ownership for flexible nitrogen compression<\/a> is often lower than maintaining multiple single-purpose compressors, even when accounting for the slightly higher specific power consumption.<\/p>\n<\/div>\n

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Customization & OEM Capabilities<\/h2>\n

We provide flexible customization for the ZW-3.1\/5~20:<\/p>\n