Mid-Size Series Port Sizes 1/4" to 1/2"; Flow to 105 scfm (2974 l/min)

Product Overview

The ROSS Controls Mid-Size Integrated Filter/Regulator consolidates air filtration and pressure regulation into a single modular assembly for pneumatic systems with port sizes from 1/4" to 1/2" and flow requirements to 105 scfm (2974 l/min). Combining these two air preparation functions in one unit reduces installation space, plumbing connections, and potential leak points compared to separate filter and regulator installations.

A self-relieving piston-type regulator provides stable, precise outlet pressure control. A non-relieving regulator option is available for applications where downstream pressure retention after supply shut-off is required, such as circuits that must hold pressure during a controlled shutdown sequence. The adjusting knob is removable for tamper resistance, preventing unauthorized pressure changes on shared equipment or in environments where set points must remain fixed between production shifts.

Bowl options include a polycarbonate plastic filter bowl with zinc shatterguard for visual condensate monitoring and a zinc bowl for applications requiring higher pressure capability or chemical resistance. Automatic drain and manual drain configurations are available. A built-in pressure gauge provides direct visual monitoring of regulated outlet pressure at the unit.

The modular design enables assembly into complete FRL trains with ROSS lubricators and individual filter units. The unit supports panel mounting for installation through control panel or enclosure walls, with the bowl accessible from the front for routine maintenance without panel disassembly.

Key Engineering Features

• Filter and Regulator Consolidated in Single Assembly - Combines filtration and pressure regulation in one modular unit, reducing installation space, connection hardware, and potential leak points compared to separate filter and regulator installations in space-limited pneumatic systems.
• Self-Relieving Piston-Type Regulator - Standard self-relieving piston regulator provides stable outlet pressure control. When inlet pressure drops below set point, the self-relieving feature allows excess downstream pressure to bleed back through the regulator, maintaining set pressure without downstream manual venting.
• Non-Relieving Regulator Option - Non-relieving regulator variant retains downstream pressure after supply shut-off, required for circuits where controlled pressure hold-down after supply isolation is part of the machine safety or process sequence.
• Removable Adjusting Knob for Tamper Resistance - The pressure adjustment knob is removable after setting, preventing unauthorized pressure changes in shared equipment environments and production lines where consistent actuation pressure is critical to product quality.
• Pressure Gauge Included - Built-in pressure gauge provides direct visual monitoring of regulated outlet pressure. Gauge ports are located front and rear for flexible installation orientation and gauge placement.
• Modular Mounting for FRL Assembly - Modular design allows direct assembly with ROSS lubricators and individual filter units, creating complete FRL trains without intermediate pipe connections.
• Polycarbonate Bowl with Zinc Shatterguard - Transparent polycarbonate bowl allows visual condensate level inspection; zinc shatterguard provides fragment containment and mechanical protection for the bowl in demanding industrial environments.
• Zinc Bowl Option - Metal zinc bowl provides higher maximum operating pressure capability (200 psig) and elevated temperature rating, suitable for high-pressure and warmer industrial environments.
• Automatic or Manual Drain - Automatic drain ensures continuous condensate removal without operator intervention. Manual drain provides controlled condensate management for supervised installations.
• Panel Mounting Capability - Supports panel mounting for integration into control panels and electrical enclosures, with the bowl side accessible from the front for routine filter element replacement and condensate draining.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Automated Assembly and Production Lines

• Air preparation for automated assembly stations where consistent regulated pressure is critical to product quality and the removable knob prevents operators from adjusting pressure between shifts, maintaining set actuation forces throughout the production run.
• Multi-station assembly equipment where a FR at each station ensures clean, regulated air to pneumatic fixtures, clamps, and drivers, with modular assembly enabling lubricators to be added where tool lubrication is needed.
• Robotic end-of-arm tooling air preparation where the compact modular unit mounts within the robot cell, providing point-of-use filtration and regulation close to the tooling for minimal unregulated supply volume.
• Automotive sub-assembly lines where the non-relieving regulator option is selected to maintain fixture clamp pressure during controlled shutdown sequences, preventing part release due to supply pressure loss.

Machine Tool and Metalworking

• CNC machine tool air preparation for spindle air purge, workholding, and coolant blow-off circuits where the self-relieving piston regulator maintains stable pressure despite varying flow demand from multiple simultaneous pneumatic circuits.
• Grinding and honing machine air gauging supply where precise regulated pressure and clean filtered air maintain gauge repeatability across production runs.
• Metalworking equipment air preparation where the zinc shatterguard protects the filter bowl from metal chips, swarf, and other abrasive debris that can impact or scratch polycarbonate bowls without the shatterguard protection.

Process Industry and Material Handling

• Pneumatic conveying and material transfer equipment where the integrated filter/regulator maintains clean regulated air to blowback valves, fluidizing pads, and pneumatic divert valves throughout the conveying system.
• Bulk material handling equipment including pneumatic filling heads, dosing valves, and bag-filling actuators where consistent regulated pressure ensures accurate fill weights and proper valve actuation timing.
• Chemical processing equipment where the zinc bowl option provides chemical resistance superior to polycarbonate and the tamper-resistant knob maintains process pressure set points without risk of adjustment during operation.

Packaging and Printing

• Carton and case forming machinery air preparation where the integrated FR provides clean regulated air to pneumatic folding, gluing, and forming actuators, with modular lubricator add-on supporting systems with pneumatic tools requiring lubrication.
• Printing press air preparation for pneumatic sheet feeders, pile height adjusters, and delivery actuators, where clean filtered air prevents contamination of the printing process and consistent pressure maintains feeder registration accuracy.
• Flexible packaging line air preparation for pneumatic seal bars, cutter actuators, and film handling components requiring precise pressure control and reliable filtration throughout continuous production.

Ordering and Model Number Configuration

The Integrated Filter/Regulator is available in multiple configurations. Contact ROSS Controls or visit the product page to select the appropriate model based on port size, bowl type, drain type, and regulator function.

Self-relieving piston regulator is standard. Specify non-relieving option when downstream pressure retention after supply shut-off is required.

For G (BSPP) threads, add the prefix C to the NPT model number.

Polycarbonate bowl with zinc shatterguard is standard. Zinc bowl is available as an option for higher pressure and temperature applications.

Automatic drain is recommended for unattended or high-humidity environments. Manual drain is appropriate for supervised or low-condensate installations.

Contact ROSS Controls at (800) 438-7677 for complete model number configuration, modular assembly hardware, and replacement filter element model numbers.

Accessories

Replacement Filter Elements

Standard 5-micron polyethylene element and optional sintered bronze elements in 5-, 20-, and 40-micron ratings are available for the Mid-Size Integrated FR. Contact ROSS Controls for model numbers.

Modular Lubricator Add-On

The modular mounting design supports direct assembly with ROSS mid-size modular lubricators, creating a complete FR+L or FRL train. Contact ROSS Controls for modular assembly hardware model numbers and specifications.

Pressure Gauge Options

The built-in gauge can be configured for front or rear gauge port installation. Additional gauge range and dial size options may be available. Contact ROSS Controls for gauge configuration options.

Related Products & Accessories

• MD3 Series Integrated Filter/Regulator - Modular integrated FR with diaphragm regulator, L-O-X lockout valve option, two gauge ports, locking key, port sizes 1/4" to 1/2", flow to 110 scfm. https://www.rosscontrols.com/en/series/66-md3-series
• 132 Mid-Size Series Integrated Filter/Regulator - Modular-mount integrated FR with piston regulator, polycarbonate or zinc bowl, port sizes 1/4" to 1/2", flow to 100 scfm. https://www.rosscontrols.com/en/series/132-mid-size-series
• 74 Full-Size Integrated Filter/Regulator - Modular integrated FR with piston regulator, locking key, external drain option, port sizes 1/4" to 3/4", flow to 180 scfm. https://www.rosscontrols.com/en/series/74-full-size-series
• 131 Miniature Series Integrated Filter/Regulator - Inline-mount integrated FR for port sizes 1/8" and 1/4" with flow to 19 scfm. https://www.rosscontrols.com/en/series/131-miniature-series
• ROSS L-O-X Lockout Valves - L-O-X lockout valves for energy isolation that can be combined with FRL assemblies in modular configurations. https://www.rosscontrols.com/en/categories/lockout-valves

Frequently Asked Questions (FAQ)

Q: What does an integrated filter/regulator do that separate components cannot?

A: An integrated filter/regulator performs both particulate filtration and pressure regulation in a single compact assembly. Compared to separate components, the integrated unit reduces the number of pipe connections, overall installation length, potential leak points, and component count. For space-limited installations, the single-unit approach can be critical for fitting within tight machine enclosures or compact pneumatic circuit layouts.

Q: What is the maximum flow capacity of the ?

A: The Mid-Size Integrated Filter/Regulator is rated for flow to 105 scfm (2974 l/min). This capacity supports the majority of mid-size industrial pneumatic circuits using 1/4" to 1/2" port connections. For higher flow requirements, the Series 74 Full-Size (to 180 scfm) or Series MD4 (to 230 scfm) should be considered.

Q: What port sizes are available?

A: The is available in 1/4 inch, 3/8 inch, and 1/2 inch port sizes. Both NPT and G (BSPP) thread options are available. For G thread models, add the prefix C to the standard model number.

Q: What is the difference between self-relieving and non-relieving regulator options?

A: A self-relieving regulator allows excess downstream pressure to bleed back through the regulator when the set point is reduced or when supply pressure drops below set point. A non-relieving regulator blocks this backflow path, holding downstream pressure after supply shut-off. Non-relieving is required when the downstream circuit must retain pressure during controlled shutdown sequences, such as when pneumatic clamps must hold position during a machine stop sequence.

Q: Why would I choose the removable knob (tamper-resistant) option?

A: The removable adjusting knob prevents unauthorized pressure changes after the set point has been established. This is important in production environments where consistent actuator force, cylinder speed, or tool torque depends on maintaining a specific regulated pressure. Once the knob is removed, the pressure setting cannot be changed without a replacement knob, deterring accidental or intentional adjustment.

Q: What bowl options are available and how do I choose?

A: The polycarbonate bowl with zinc shatterguard provides visual condensate inspection and is rated to 150 psig and 125 degrees F. The zinc bowl extends maximum operating pressure to 200 psig and the temperature range to 175 degrees F (80 degrees C), and provides better chemical resistance. Select the zinc bowl for high-pressure, high-temperature, or chemically aggressive environments.

Q: Can the be assembled into a complete FRL train?

A: Yes. The modular mounting design of the supports direct assembly with compatible ROSS lubricator units to create a complete FR+L assembly. Contact ROSS Controls for specific modular interface hardware and compatible lubricator model numbers.

Q: What is the maximum regulated outlet pressure?

A: The piston-type regulator is adjustable up to 100 psig (7 bar). This covers the full operating range of standard industrial pneumatic actuators and tools used with 1/4" to 1/2" port connections.

Q: What filter element is standard and what alternatives are available?

A: The standard element is a 5-micron polyethylene element. Optional sintered bronze elements in 5-, 20-, and 40-micron ratings are available. Sintered bronze elements are more durable in high-condensate environments and can be cleaned and reused in service.

Q: Does the include a pressure gauge?

A: Yes. The includes a built-in pressure gauge for direct visual monitoring of regulated outlet pressure. Gauge ports are located on both the front and rear of the unit for installation flexibility.

Q: Can the be panel mounted?

A: Yes. The supports panel mounting, with the unit installed through the panel and the bowl accessible from the front for routine maintenance. Consult the installation instructions for the panel hole dimension requirements.

Q: What is the warranty?

A: ROSS Controls provides a one-year warranty on all products covering defects in material and workmanship from the date of purchase. Contact ROSS Controls USA at (800) 438-7677 for technical support or warranty service.

Installation & Maintenance Guidelines

• Mount with the bowl oriented downward for proper condensate collection and gravity-assisted drain operation.
• For modular assembly with a lubricator, follow ROSS Controls modular assembly instructions to ensure proper interface seal engagement and fastener torque.
• Do not exceed 150 psig with polycarbonate bowl models or 200 psig with zinc bowl models.
• Remove the adjusting knob after setting the desired regulated pressure to engage the tamper-resistant function. Store the knob in a secure location accessible to authorized maintenance personnel.
• For manual drain models, drain condensate regularly before the bowl fills to capacity to prevent carryover into the downstream air circuit.
• Replace the filter element when pressure drop across the unit exceeds acceptable limits or on a scheduled maintenance interval.
• Use thread sealant or PTFE tape on NPT connections; apply sparingly to avoid contamination of the air circuit.
• Verify that outlet pressure is set within the acceptable range of downstream components before energizing pneumatic circuits.
• When panel mounting, ensure that the mounting hardware is torqued to specification and that the bowl is accessible from the front of the panel for routine maintenance.
• After installation, gradually increase supply pressure while checking all connections for leaks before bringing the system to full operating pressure.

Warranty & Global Support

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

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

Contact ROSS Controls USA at (800) 438-7677 or visit rosscontrols.com for product configuration, technical support, and distributor locator services.

For complete technical data, dimensional drawings, and product configurator access, visit the ROSS Controls product page or contact ROSS Controls directly.

Download Catalog: https://www.rosscontrols.com/en/series/65-mid-size-series