Mid-Size Series Port Sizes 1/4" to 1/2"; Flow to 100 scfm (2832 l/min)

Product Overview

The ROSS Controls Mid-Size Series is a Filter/Regulator and Lubricator combo engineered for modular mounting installations in pneumatic systems requiring port sizes from 1/4" to 1/2" and flow rates up to 100 scfm (2832 l/min). By consolidating filtration, pressure regulation, and sight-feed lubrication in a single modular assembly, the series reduces the installation complexity and potential leak points compared to assembling three separate inline components.

The filter section is available with polycarbonate plastic bowls fitted with steel shatterguards for impact protection in industrial environments, or with zinc metal bowls that extend pressure and temperature capability. Condensate management options include automatic drain for continuous hands-free removal and manual drain for maintenance-scheduled operations.

The regulator in the Mid-Size Series is a piston-type design, available in both self-relieving and non-relieving configurations. Piston regulators deliver stable regulated output pressure with high resistance to creep and cycling-induced set-point drift, making them well suited to manufacturing environments with high-cycle pneumatic circuits. A pressure gauge is supplied as standard for immediate monitoring of regulated downstream pressure.

The integrated sight-feed lubricator provides visible confirmation of oil delivery, allowing operators to verify that lubrication is occurring at a glance. The sight-feed design delivers oil drops into the air stream through a transparent sight dome, providing a direct visual indicator of oil feed rate. The modular construction of the series allows assemblies to be built up from individual modular filter, regulator, and lubricator sections, and to be disassembled for element replacement or component upgrade without disturbing the installed pipe connections.

Key Engineering Features

• Modular Mounting - Designed for modular assembly and panel mounting, allowing individual sections to be combined, replaced, or serviced without removing the entire assembly from the compressed air line.
• Sight-Feed Lubricator - Transparent sight dome provides direct visual confirmation of oil delivery rate, enabling operators to verify that lubrication is occurring and adjust the feed rate during normal operation.
• Piston-Type Regulator - Piston design delivers stable regulated output pressure with low creep and sustained set-point accuracy through extended high-cycle duty.
• Self-Relieving or Non-Relieving Regulator - Self-relieving vents downstream overpressure when the set point is reduced; non-relieving retains downstream pressure for closed-system applications.
• Polycarbonate Bowl with Steel Shatterguard or Zinc Bowl - Polycarbonate bowl with shatterguard provides visual condensate monitoring and impact protection; zinc bowl suits environments with elevated pressure or temperature requirements.
• Automatic or Manual Drain - Automatic drain provides unattended continuous condensate removal; manual drain allows controlled maintenance-interval drainage.
• Integral Pressure Gauge - Standard pressure gauge mounted on the regulator section provides real-time regulated output pressure indication.
• Filter and Regulator Consolidated in Single Assembly - Integration of the filter/regulator stage reduces external connections between the filter and regulator sections, improving sealing reliability.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

General Industrial Automation

• Central air preparation stations for manufacturing cells with multiple pneumatic actuators, cylinders, and pneumatic tools operating from 1/4" to 1/2" main supply connections.
• Pneumatic panel assemblies on automated production lines where the modular mounting design of the series allows compact arrangement of filter, regulator, and lubricator components within control cabinets.
• Conveyor system pneumatic drives, brake actuators, and tension control cylinders requiring clean, regulated, lubricated air at moderate flow rates.
• Material handling equipment including pneumatic lifts, tilters, and transfer arms where reliable air conditioning protects high-cycle actuators.

Machine Tool and Metalworking

• Multi-axis machining centers with 1/2" pneumatic supply connections to spindle air purge, workholding cylinders, tool change actuators, and chip blow-off systems requiring clean regulated and lubricated air.
• Grinding machines and surface treatment equipment where consistent lubrication from the sight-feed lubricator protects reciprocating actuators and pneumatic valve trains.
• Stamping and press operations with pneumatic clutch-brake control requiring 100 scfm flow capacity and reliable pressure regulation.

Automotive Assembly and Test

• Automotive assembly line air preparation stations supplying pneumatic tooling, torque guns, and fixture actuators with clean, regulated, and lubricated compressed air.
• Engine and transmission test cell pneumatic circuits requiring 1/4" to 1/2" supply connections with precise regulated pressure and continuous lubrication for control valve actuators.
• Powertrain component assembly stations with multiple pneumatic cylinders, where the modular design of the series simplifies future component servicing.

Packaging and Process Equipment

• Industrial packaging machines including case erectors, cartoners, form-fill-seal equipment, and palletizers with 1/4" to 1/2" pneumatic supply lines requiring full air preparation.
• Filling and capping machinery in food and beverage production where stable regulated pressure and consistent lubrication maintain cycle rates and reduce maintenance intervals.
• Pharmaceutical process equipment with pneumatic actuators requiring clean, conditioned air and reliable pressure regulation within cGMP production environments.

Woodworking and Plastics Processing

• Woodworking machinery including panel saws, CNC routers, and edge banders with pneumatic clamping and feed systems requiring 100 scfm air preparation.
• Injection molding machine pneumatic circuits for mold clamping, core pull, and robot interface actuators requiring modular, maintainable air preparation.

Maintenance and Facility Air Systems

• Compressed air drops at maintenance workstations supplying impact wrenches, air ratchets, and pneumatic grinders with full-function air conditioning via a single modular assembly.
• Facility air supply headers in manufacturing plants where the series modular FRL conditions air at each branch feed to individual machine groups.

Ordering and Model Number Configuration

The ROSS Mid-Size Series FRL combo is configured by selecting port size, bowl material, drain type, and regulator relief function. Contact ROSS Controls at (800) 438-7677 or visit rosscontrols.com to generate a complete model number.

Specify port size, bowl material (polycarbonate with shatterguard or zinc), drain type, and regulator relief function (self-relieving or non-relieving) when ordering.

NPT thread is standard. Confirm G (BSPP) thread availability with ROSS Controls at time of order.

The Mid-Size Series modular design allows future addition or replacement of individual filter, regulator, or lubricator sections. Confirm modular expansion options with ROSS Controls.

For applications requiring only filtration and regulation without lubrication, refer to ROSS Controls 76 Mid-Size Series integrated filter/regulator.

Accessories

Panel and Pipe Mounting Brackets

Mounting brackets for modular installation to panels, walls, or pipe stands are available for the Mid-Size Series. Contact ROSS Controls for compatible bracket model numbers.

Replacement Filter Elements

Replacement filter bowl elements in 5-micron and 40-micron grades are available for the Mid-Size Series filter section to maintain rated filtration efficiency.

Replacement Bowls and Seals

Replacement polycarbonate and zinc metal bowls with seals are available as service parts to restore the series to full rated performance.

Sight-Feed Lubricator Accessories

Replacement sight domes and oil supply accessories for the sight-feed lubricator section are available as service parts. Contact ROSS Controls for part numbers.

Related Products & Accessories

• 76 Mid-Size Series Integrated Filter/Regulator - Standalone Mid-Size Series filter/regulator for applications requiring filtration and regulation without lubrication. https://www.rosscontrols.com/en/series/76-mid-size-series
• 106 Mid-Size Series Lubricator - Standalone Mid-Size Series sight-feed lubricator for applications requiring lubrication independent of a filter/regulator combo. https://www.rosscontrols.com/en/series/106-mid-size-series
• MD3 Series FRL Combo - MD3 Series Filter/Regulator and Lubricator combo with same port sizes and higher-specification bowl and drain options including electronic drain. https://www.rosscontrols.com/en/series/142-md3-series
• 139 Bantam Series FRL Combo - Bantam Series FRL combo for smaller port sizes 1/8" and 1/4". https://www.rosscontrols.com/en/series/139-bantam-series
• 143 Full-Size Series FRL Combo - Full-Size FRL combo for port sizes 1/4" to 3/4" and higher flow up to 140 scfm. https://www.rosscontrols.com/en/series/143-full-size-series

Frequently Asked Questions (FAQ)

Q: What does the Mid-Size Series FRL combo do?

A: The Mid-Size Series is a single modular assembly that filters particulate contamination from compressed air, regulates downstream pressure to a set value, and delivers a metered oil mist to lubricate downstream pneumatic components. All three functions are performed by one integrated assembly.

Q: What port sizes are available?

A: The Mid-Size Series is available in 1/4", 3/8", and 1/2" port sizes.

Q: What is the maximum rated flow?

A: The Mid-Size Series handles up to 100 scfm (2832 l/min).

Q: What mounting method does the series use?

A: The Mid-Size Series uses modular mounting, allowing sections to be combined, stacked, and serviced individually without removing the assembly from the compressed air line.

Q: What type of lubricator is integrated?

A: The Mid-Size Series integrates a sight-feed lubricator that displays oil delivery through a transparent sight dome, providing direct visual confirmation that lubrication is occurring at the set feed rate.

Q: What is a sight-feed lubricator and why is it useful?

A: A sight-feed lubricator delivers oil drops into the air stream through a visible sight dome. Operators can directly observe and count oil drops to verify delivery rate, making it easy to confirm lubricator function and adjust feed rate without instrumentation.

Q: What bowl materials are available?

A: The polycarbonate bowl with steel shatterguard provides visual condensate monitoring and impact protection, rated to 150 psig and 125 degrees F. The zinc metal bowl extends capability to 200 psig and 175 degrees F for higher-temperature or higher-pressure installations.

Q: What regulator type does the Mid-Size Series use?

A: The Mid-Size Series regulator is a piston-type design, available in self-relieving and non-relieving configurations. The piston design provides stable, durable pressure regulation suitable for high-cycle industrial applications.

Q: What drain options are available?

A: The automatic drain continuously expels condensate without operator action. The manual drain requires the operator to open the drain valve. Automatic drain is recommended for unattended or high-condensate applications.

Q: What filtration grades are available?

A: Mid-Size Series filter elements are available in 5-micron and 40-micron grades. The 5-micron element removes fine particulate for sensitive pneumatic components; the 40-micron element handles coarser particulate in general-purpose applications.

Q: Can I add or replace sections of the modular assembly?

A: Yes. The modular design of the series allows individual filter, regulator, or lubricator sections to be replaced or serviced independently. Contact ROSS Controls to confirm modular section compatibility and assembly procedures.

Q: What lubricant should be used?

A: Use petroleum-based oil with ISO 32 viscosity or lighter. Do not use synthetic ester-based or phosphate-ester lubricants, which are incompatible with standard nitrile seals throughout the assembly.

Q: How is the output pressure set?

A: Pull the regulator adjustment knob upward to unlock it, turn clockwise to increase pressure or counterclockwise to decrease, verify the output pressure on the gauge, then push the knob down to lock the setting.

Q: Where can I find product documentation?

A: Catalogs, data sheets, and installation instructions for the Mid-Size Series are available at rosscontrols.com. Contact ROSS Controls at (800) 438-7677 for configuration support and distributor referral.

Installation & Maintenance Guidelines

• Install the assembly with the bowls oriented downward to allow condensate to collect at the bowl bottom and drain properly.
• Align the flow direction indicator on the assembly body with the compressed air supply flow direction before tightening connections.
• Mount in a location that provides full access to the filter bowl drain, lubricator fill and sight dome, pressure gauge, and regulator adjustment knob.
• Apply thread sealant to pipe port connections and tighten to the torque specified in the installation instructions. Do not overtighten polycarbonate bowl or shatterguard connections.
• Confirm that inlet pressure does not exceed 150 psig for polycarbonate bowls or 200 psig for zinc bowls.
• Confirm that ambient and media temperatures are within the rated range for the bowl material selected.
• Fill the lubricator oil bowl with the appropriate petroleum-based ISO 32 oil before initial start-up.
• Pressurize the system slowly after installation. Check all connections, bowl seals, and drain valve with leak detection solution.
• Set regulated output pressure by pulling the knob up to unlock, adjusting to the target value, and pushing down to lock.
• Observe the sight dome at start-up to confirm that oil is feeding at the intended rate. Adjust if necessary.
• Drain the filter bowl on a regular schedule and verify that automatic drain devices operate at each maintenance inspection.
• Replace the filter element when elevated differential pressure is observed or on a scheduled service interval.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all products covering defects in material and workmanship from the date of purchase.

Technical support is available through ROSS Controls USA at (800) 438-7677 or by visiting rosscontrols.com.

Global support is available through ROSS offices in the USA (Ferndale, Michigan headquarters), Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Contact ROSS Controls at (800) 438-7677 or visit rosscontrols.com for product configuration, replacement parts, and distributor referral.

Download Catalog: https://www.rosscontrols.com/en/documents