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20 HP 10 Bar SJ VFD Variable Speed Screw Air Compressor

The SJ RV20 is a 20 HP (15 kW) variable-speed rotary screw air compressor designed for industrial applications requiring a 10 bar compressed air supply with changing air consumption.

With a specified airflow capacity of 71 CFM (2.01 m³/min) at 10 bar, the SJ RV20 can be evaluated for medium-scale production systems, precision machinery and industrial processes where compressed air demand varies during operating cycles.

Equipped with Variable Frequency Drive (VFD) technology, the compressor adjusts motor speed according to compressed air demand within its designed operating range. Instead of operating continuously at one fixed motor speed, the system can respond to changing consumption requirements.

The SJ RV20 combines a 20 HP motor rating, single-stage rotary screw compression and variable-speed control in an industrial compressed air solution.

Potential applications include CNC and VMC machines, automotive workshops, powder coating and surface finishing systems, pneumatic automation, packaging machinery and production lines with variable air consumption. Final suitability depends on the actual airflow, pressure and air-quality requirements of the connected equipment.

Why Choose This Capacity?

Selecting an industrial air compressor requires evaluating the complete compressed air requirement rather than relying on motor horsepower alone.

The SJ RV20 provides the following specified capacity:

• Motor Power: 20 HP / 15 kW

• Operating Pressure: 10 Bar / 145 PSI

• Rated Air Flow: 71 CFM / 2.01 m³/min

• Compressor Technology: Single-Stage Rotary Screw

• Operating Technology: Variable Speed with VFD

This capacity can be considered for medium-scale industrial systems where the required compressed air flow is compatible with 71 CFM at 10 bar.

The VFD control system allows motor speed to change according to compressed air demand within the compressor's designed operating range. This can be relevant for production environments where consumption changes between machine cycles, production batches or operating shifts.

Before selecting the SJ RV20, evaluate:

• Average compressed air consumption across the production cycle.

• Peak airflow when multiple machines operate simultaneously.

• Minimum pressure required at the connected machinery.

• Pressure losses through dryers, filters, piping and distribution equipment.

• Daily operating hours and variations in compressed air demand.

• Future production expansion and additional pneumatic equipment.

A compressor should not be oversized simply to provide spare capacity. Excess capacity can increase initial investment and may affect operating efficiency when the compressor frequently operates below its intended range.

The 10 bar pressure rating should also be selected according to actual machinery requirements. If the process only requires a lower pressure, operating at 10 bar may increase electricity consumption without providing a useful production benefit.

Advanced Rotary Screw Compression Technology

The SJ RV20 uses rotary screw compression technology for industrial compressed air generation.

In a rotary screw compressor, atmospheric air enters through the intake system and moves into the compression element. The rotating screw elements progressively reduce the available air volume, increasing its pressure before compressed air passes through the downstream separation and cooling arrangement.

The rotary screw design supports compressed air generation for suitable industrial operating conditions.

Key functional systems include:

• Rotary Screw Airend: Performs the compression process through rotating screw elements.

• Air Intake System: Supplies incoming atmospheric air to the compression element.

• Lubrication System: Supports lubrication, sealing and temperature management in an oil-injected compressor configuration.

• Air-Oil Separation System: Separates lubricating oil from compressed air in an oil-injected configuration.

• Oil Filtration System: Helps maintain lubricating oil cleanliness.

• Cooling System: Manages operating temperatures of the compressor and compressed air.

• Control System: Supports compressor operation and monitoring according to the supplied configuration.

The SJ RV20 uses a single-stage rotary screw arrangement with a specified motor rating of 20 HP and a rated airflow of 71 CFM at 10 bar.

Actual compressed air quality depends on the compressor configuration and downstream treatment equipment. Where the process requires specific moisture, particulate or oil-content limits, suitable dryers and filters must be selected according to the required air-quality specification.

Variable Frequency Drive (VFD) Technology

The SJ RV20 uses Variable Frequency Drive technology to adjust motor speed according to compressed air demand within its designed operating range.

In a conventional fixed-speed compressor, the motor operates at a fixed speed during loaded operation. Compressor output is generally regulated through load/unload control, depending on the control system.

In a VFD-controlled compressor, the drive changes the electrical frequency supplied to the motor, allowing motor speed to vary according to the compressed air requirement.

This approach can be useful in industrial facilities where air consumption changes throughout the day or between production cycles.

Key functional advantages of VFD operation include:

• Variable Motor Speed: Adjusts motor speed according to changing compressed air demand within the designed operating range.

• Demand-Based Output: Helps match compressor output more closely to system consumption.

• Pressure Regulation: Supports pressure control through the supplied controller and pressure-sensing arrangement.

• Reduced Load/Unload Cycling: Can reduce conventional load/unload cycling when demand remains within the VFD operating range.

• Partial-Load Operation: Can reduce electricity consumption when demand is below full capacity, depending on the compressor's operating characteristics.

• Controlled Motor Operation: The drive manages motor speed according to its configured control parameters.

Actual energy savings depend on the site's demand profile, operating pressure, compressor operating range, leakage, system design and operating hours. VFD technology does not guarantee a fixed energy-saving percentage under every operating condition.

For a technically sound selection, the compressor should be evaluated against measured or estimated compressed air consumption over a representative production cycle.

Premium Industrial Components

The SJ RV20 is designed around the functional requirements of an industrial variable-speed rotary screw compressor.

Its principal systems include the compression element, motor, VFD, air intake, lubrication, separation, cooling and electrical control arrangements.

Important component groups include:

• Rotary Screw Airend: The main compression assembly responsible for generating compressed air.

• Industrial Electric Motor: Provides the mechanical power required to operate the compressor.

• Variable Frequency Drive: Controls motor speed according to configured operating requirements.

• Air Intake Filter: Helps prevent dust and airborne particles from entering the compression system.

• Oil Filter: Helps maintain lubricating oil cleanliness in an oil-injected configuration.

• Air-Oil Separator Element: Separates oil from compressed air in an oil-injected configuration.

• Oil Cooler: Helps control lubricating oil temperature.

• Aftercooler: Reduces compressed air temperature before downstream treatment, where included.

• Compressor Controller: Provides operating control and monitoring functions according to the supplied configuration.

• Electrical Protection System: Supports protection of the motor and electrical components according to the installed panel.

Exact component brands, ratings and configurations should be confirmed in the approved technical quotation for the supplied SJ RV20 unit.

Reliable Industrial Performance

The SJ RV20 is intended for industrial compressed air systems where a 20 HP motor rating, 10 bar pressure and variable-speed operation are required.

Its specified airflow of 71 CFM (2.01 m³/min) provides a reference for evaluating whether the compressor can meet the connected machinery's demand at the specified pressure.

The VFD control system allows motor speed to respond to changing air consumption within its designed operating range. This can be useful in production environments where pneumatic demand varies between machine cycles, operating shifts or production batches.

Potential application areas include:

• CNC and VMC machines requiring compressed air for selected pneumatic functions.

• Automotive workshops using pneumatic tools and equipment.

• Powder coating and surface finishing systems.

• Spray painting operations requiring controlled compressed air supply.

• Pneumatic automation and control systems.

• Packaging machinery with variable operating cycles.

• Medium-scale manufacturing and engineering units.

• Production lines with changing compressed air consumption.

For reliable operation, the compressor should be correctly sized and installed with adequate ventilation, a suitable electrical supply, appropriate compressed air treatment and a properly designed distribution network.

The SJ RV20 is a capacity-specific industrial compressor solution. Final suitability should be determined by comparing the actual application requirements with its rated pressure, airflow and VFD operating range.

Heavy Duty Cooling System

The SJ RV20 is designed with a cooling arrangement to manage the heat generated during compression and support reliable operation in industrial environments.

During compression, air and lubricating oil temperatures increase. The cooling system helps maintain suitable operating temperatures for the compressor components.

The cooling arrangement may include:

• Oil Cooling System: Helps regulate lubricating oil temperature in an oil-injected compressor configuration.

• Compressed Air Aftercooler: Reduces compressed air temperature before downstream treatment, where included.

• Cooling Fan: Supports heat removal from the compressor enclosure.

• Ventilation Arrangement: Helps circulate cooling air through the compressor.

• Temperature Monitoring: Supports operating temperature monitoring and alarm functions, subject to the installed controller configuration.

For reliable operation, the compressor should be installed in a properly ventilated area with sufficient clearance around its air intake, cooling outlets and service access points. Hot cooling air should not recirculate into the compressor cooling system.

The final cooling arrangement depends on the supplied compressor configuration and installation conditions.

Intelligent Electrical & Safety Features

The SJ RV20 uses Variable Frequency Drive (VFD) technology to control motor speed according to compressed air demand within its designed operating range.

Its electrical control and protection arrangement supports compressor operation and monitoring. Exact protection functions and available controller features depend on the supplied electrical panel, VFD and controller configuration.

Functional electrical and safety provisions may include:

• Variable Frequency Drive: Controls motor speed by adjusting the electrical frequency supplied to the motor.

• Motor Protection: Provides protection against specified motor operating faults.

• Overload Protection: Helps protect the motor and drive system against excessive electrical loading.

• Phase Protection: Phase-related protection, where provided in the electrical panel.

• Temperature Monitoring: Monitors compressor operating temperatures where supported by the controller.

• Pressure Monitoring: Provides pressure feedback for variable-speed control according to the supplied control arrangement.

• Emergency Stop: Emergency stopping provision according to the supplied electrical arrangement.

• Operating Status Display: Displays operating conditions and available system information.

• Fault Indication: Displays or indicates detected faults according to controller functionality.

The motor, VFD and electrical protection settings must be compatible with the compressor motor specifications and operating requirements. Electrical installation should follow the manufacturer's documentation and applicable electrical standards.

Standard Features

The following are the principal functional systems associated with the SJ RV20 product configuration. Exact component brands, specifications and included accessories should be confirmed in the approved quotation.

• 20 HP industrial variable-speed rotary screw compressor.

• 15 kW motor power rating.

• 10 bar maximum operating pressure rating.

• Rated airflow of 71 CFM (2.01 m³/min).

• Single-stage rotary screw compression arrangement.

• Variable Frequency Drive (VFD) control system.

• Variable motor speed according to compressed air demand within the designed operating range.

• Air intake filtration system.

• Lubricating oil circulation system for oil-injected configuration.

• Oil filtration system.

• Air-oil separation system for oil-injected configuration.

• Cooling arrangement for operating temperature management.

• Electrical control and protection panel.

• Compressor controller according to supplied configuration.

• Pressure monitoring and variable-speed control according to the supplied control arrangement.

• Industrial compressor enclosure, where included in the supplied model configuration.

Optional Features

The SJ RV20 can be integrated with additional compressed air treatment, storage and distribution equipment according to the requirements of the installation.

The following items should be treated as optional unless specifically included in the commercial quotation.

• Refrigerated Air Dryer: Reduces moisture content in compressed air for general industrial applications.

• Desiccant Air Dryer: Provides lower pressure dew point air where required.

• Air Receiver Tank: Stores compressed air and helps manage short-term demand fluctuations.

• Moisture Separator: Removes bulk liquid moisture from compressed air.

• Pre-Filter: Removes particulate contamination and liquid aerosols according to its filtration rating.

• After-Filter: Provides additional downstream filtration.

• Micro Filter: Used where finer aerosol filtration is required.

• Activated Carbon Filter: Helps reduce oil vapour and odour, subject to the specified filter design.

• Automatic Drain: Removes accumulated condensate from selected components.

• Aluminium Compressed Air Piping: Provides a distribution network for treated compressed air.

• Oil-Water Separator: Treats compressor condensate before disposal, subject to local environmental requirements.

• Airflow Meter: Measures compressed air consumption within the distribution network.

• Dew Point Monitor: Monitors moisture performance downstream of the air dryer.

The dryer and filtration system should be selected for the required airflow of 71 CFM at the specified operating pressure. Selection must also consider inlet air temperature, ambient conditions, pressure drop, required pressure dew point and filtration grade.

Technical Specifications

Model Number: SJ RV20

Product Type: Industrial Rotary Screw Air Compressor

Compressor Technology: Rotary Screw

Operating Technology: Variable Speed

Drive Technology: Variable Frequency Drive (VFD) / Variable Speed Drive (VSD)

Compression Stage: Single Stage

Motor Power: 20 HP

Motor Power: 15 kW

Maximum Operating Pressure: 10 Bar

Pressure Equivalent: 145 PSI

Pressure Equivalent: 1 MPa

Rated Air Flow: 71 CFM

Rated Air Flow: 2.01 m³/min

Note: These airflow and pressure values are specific to the SJ RV20 10 bar configuration. The model has different listed airflow capacities at other pressure ratings:

• 8 Bar: 85 CFM / 2.41 m³/min

• 10 Bar: 71 CFM / 2.01 m³/min

• 13 Bar: 60 CFM / 1.69 m³/min

These pressure-specific airflow ratings should not be interchanged when selecting the compressor.

Industrial Applications

The SJ RV20 20 HP VFD screw air compressor can be evaluated for industrial applications requiring a 10 bar compressed air supply with changing consumption patterns.

Its specified airflow of 71 CFM (2.01 m³/min) at 10 bar makes it relevant for medium-scale production systems and selected precision equipment, provided the actual airflow and pressure requirements remain within the compressor's operating capability.

Potential applications include:

1. CNC and VMC Machining Centres

Can be evaluated for machining applications requiring compressed air for tool clamping, pneumatic fixtures, air purging and other machine-related functions. The combined airflow requirement of simultaneously operating machines must be checked.

2. Automotive Workshops

Can support selected pneumatic tools, maintenance equipment and workshop machinery. The required pressure and airflow should be checked against the equipment specifications.

3. Powder Coating and Surface Finishing

Can be considered for powder coating installations using compressed air for selected pneumatic functions. Air treatment and moisture control should be selected according to the coating process requirements.

4. Spray Painting Systems

Can be evaluated for spray painting and coating applications where compressed air demand varies with production cycles. The spray equipment's required airflow, pressure stability and air quality must be verified before selection.

5. Pneumatic Automation Systems

Can support selected pneumatic cylinders, actuators, fixtures and automated handling equipment when their combined compressed air requirement is within the compressor's rated capacity.

6. Packaging Machinery

Can be considered for filling, sealing, labelling and other packaging equipment with variable pneumatic consumption across operating cycles.

7. Medium-Scale Manufacturing Units

Can be evaluated for manufacturing facilities operating multiple pneumatic machines, provided their simultaneous and peak air consumption remains within the rated capacity.

8. Engineering and Fabrication Workshops

Potentially suitable for selected pneumatic tools, air-operated machinery and workshop equipment requiring a 10 bar compressed air supply.

9. Industrial Assembly Lines

Can support selected pneumatic assembly tools, fixtures and automated production equipment where compressed air demand changes between production cycles.

10. Plastic Processing Support Systems

Can be evaluated for auxiliary pneumatic functions in plastic processing facilities, subject to the actual pressure and airflow requirements of the connected equipment.

The compressor should not be selected only because an application has variable air demand. Actual average consumption, peak airflow, operating pressure, simultaneous equipment usage and the VFD's designed operating range must be evaluated.

For food and pharmaceutical installations, general utility compressed air should not automatically be considered suitable for direct product contact or critical process applications. Such installations require a defined air-quality specification, suitable filtration and drying, and validation against the process requirements.

Compatible Accessories

The SJ RV20 can be integrated with suitable compressed air storage, treatment and distribution equipment to develop a complete industrial compressed air system.

Compatible accessories include:

• Air Receiver Tank – Provides compressed air storage and helps stabilise system pressure.

• Refrigerated Air Dryer – Removes moisture for general-purpose industrial compressed air.

• Desiccant Air Dryer – Provides lower pressure dew point air where required.

• Moisture Separator – Removes bulk liquid water from compressed air.

• Pre-Filter – Removes larger particles and liquid contaminants.

• After-Filter – Provides additional downstream filtration.

• Micro Filter – Supports finer aerosol filtration requirements.

• Activated Carbon Filter – Helps reduce oil vapour and odour.

• Automatic Drain Valve – Automatically removes accumulated condensate.

• Aluminium Air Piping – Distributes compressed air across the factory.

• Oil-Water Separator – Treats oil-contaminated condensate before disposal.

• Airflow Meter – Measures compressed air consumption and supports system monitoring.

• Dew Point Monitor – Monitors moisture performance of treated compressed air.

Accessory selection should be based on the required pressure dew point, filtration grade, airflow, pressure drop, condensate load and application-specific air-quality requirements.

Frequently Asked Questions

Q1. What is the motor capacity of the SJ RV20 VFD screw air compressor?

The SJ RV20 is a 20 HP industrial variable-speed screw air compressor with a motor power rating of 15 kW.

Q2. What is the airflow capacity of the SJ RV20 at 10 bar?

The specified airflow is 71 CFM, equivalent to 2.01 m³/min, at the 10 bar pressure rating.

Q3. What is the difference between the SJ RV20 VFD and a fixed-speed screw compressor?

The SJ RV20 uses a Variable Frequency Drive to adjust motor speed according to compressed air demand within its designed operating range. A fixed-speed compressor operates at a fixed motor speed during loaded operation and typically regulates output through load/unload control.

Q4. How does VFD technology affect electricity consumption?

A VFD can reduce motor speed when compressed air demand decreases, potentially reducing electricity consumption during partial-load operation. Actual savings depend on the demand profile, operating pressure, compressor operating range, leakage, system design and operating hours. A fixed energy-saving percentage cannot be guaranteed.

Q5. Which industries can use the SJ RV20 10 bar compressor?

It can be evaluated for CNC and VMC machining centres, automotive workshops, powder coating and surface finishing systems, spray painting operations, pneumatic automation, packaging machinery, manufacturing units and industrial assembly lines.

Q6. Can the SJ RV20 handle changing compressed air demand?

The VFD adjusts motor speed according to system demand within its designed operating range. Actual pressure stability depends on controller settings, system design, demand fluctuations and compressor operating limits.

Q7. Can the SJ RV20 operate with an air dryer and receiver tank?

Yes. It can be integrated with a suitably sized air receiver tank, refrigerated or desiccant air dryer, moisture separator and filtration equipment. These accessories should be selected according to the compressor airflow, operating pressure and required compressed air quality.

Q8. Is the SJ RV20 suitable for continuous industrial operation?

It can be evaluated for continuous industrial applications when the actual demand remains within the compressor's specified operating range and the installation complies with manufacturer requirements. The application should be assessed for airflow, pressure, operating hours and duty requirements.

Q9. What maintenance is required for the SJ RV20?

Routine maintenance generally includes inspection and servicing of the air intake filter, oil filter, air-oil separator, compressor oil, cooling system, electrical connections and VFD-related components according to the manufacturer's maintenance schedule. Actual service intervals should follow the approved service documentation.

Q10. Should I choose a 10 bar compressor for an 8 bar application?

Not automatically. The required pressure should be based on the machinery's actual minimum operating pressure and distribution-system losses. Operating at a higher pressure than necessary can increase electricity consumption. A 10 bar model should be selected when the application genuinely requires it.

Q11. Is the SJ RV20 suitable for food and pharmaceutical applications?

It may be considered for general utility compressed air, depending on the application. Direct product-contact and critical process applications require a defined compressed air quality specification, suitable downstream treatment and process validation. The compressor alone does not guarantee product-contact air quality.

Why Choose Sarv Jagat?

Sarv Jagat Corporation provides industrial compressed air solutions for manufacturing facilities, engineering industries and process applications.

The SJ RV20 is part of the Sarv Jagat variable-speed rotary screw compressor range, designed for industrial users evaluating controlled compressed air delivery at 10 bar.

Reasons to consider Sarv Jagat:

• Variable-Speed Compressor Range: Solutions for applications with changing compressed air demand.

• Industrial Compressor Range: Multiple motor capacities, pressure ratings and airflow configurations.

• Technical Selection Support: Assistance in evaluating compressor capacity, pressure requirements and VFD suitability.

• Complete Compressed Air Solutions: Compressor systems can be configured with air receivers, dryers, filters and piping accessories.

• Spare Parts Support: Assistance with compatible compressor maintenance components, subject to model and configuration.

• Service Support: Compressor maintenance and troubleshooting support.

• Industrial Applications: Equipment selection for manufacturing, engineering and other compressed-air-dependent industries.

• Ahmedabad-Based Business: Sarv Jagat Corporation operates from Ahmedabad, Gujarat, India, serving industrial customers.

For SJ RV20 pricing, technical details, VFD configuration, installation requirements and a customised compressed air system quotation, contact Sarv Jagat Corporation.

Sarv Jagat – Industrial Screw Air Compressors, Compressed Air Solutions, Spares & Service.

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