Standard pressure regulators from ROSS provide superior performance through dual design options: piston construction for highest air flow applications and diaphragm design for enhanced sensitivity and quick response times. These regulators include integrated pressure gauges and feature removable adjusting knobs for tamper resistance—a critical feature in manufacturing environments where pressure consistency directly impacts product quality and equipment safety.

The standard series accommodates flow rates from 23 to 220 scfm (standard flow) and offers both self-relieving and non-relieving configurations. Multiple port sizes from 1/8" to 1-1/2" allow integration into virtually any pneumatic system architecture. Optional reverse flow capability on selected models provides quick exhausting functionality for applications like weld guns and automated assembly equipment that require rapid depressurization cycles.

Right-Angle and Bantam Series

The Right-Angle series delivers 55 scfm maximum flow with compact in-line design, while the Bantam series provides modular flexibility at 23 scfm for space-constrained applications. Both feature piston or diaphragm options with operating pressure up to 150 psig inlet and adjustable outlet up to 100 psig.

Miniature and Mid-Size Series

Miniature regulators support up to 40 scfm for applications requiring reduced footprint, while Mid-Size models deliver 100+ scfm with modular configuration. These series accept inlet pressures up to 250 psig and provide adjustable outlet regulation from 0-150 psig, making them ideal for precision machining, packaging automation, and industrial assembly applications.

Full-Size and MD Series Regulators

The Full-Size and MD3TM/MD4TM series represent ROSS's most versatile pressure control solutions, supporting flow rates up to 220 scfm and maximum inlet pressures of 300 psig. These models feature advanced piston and diaphragm designs with multiple gauge options (0-60 psig, 0-200 psig configurations), removable locking keys for tamper-proof settings, and optional adjustment springs for custom pressure ranges up to 200+ psig outlet.

High-Pressure Regulators for Demanding Applications

High-pressure regulators from ROSS extend pressure control capability to 400 psig inlet, enabling applications in aerospace, industrial testing, and hydraulic system support. These specialized regulators feature piston construction optimized for extreme pressure environments while maintaining precise outlet regulation up to 390 psig.

The High-Pressure series delivers 70 scfm flow capacity with both self-relieving and non-relieving configurations. These regulators are particularly valuable in systems requiring constant pressure maintenance at high inlet levels, such as compressed gas distribution networks, pressure test stations, and industrial gas preparation systems.

High-pressure models include 0-600 psig pressure gauges for clear visibility of extreme pressure conditions. The aluminum body construction provides durability and thermal stability across the 40-175°F ambient operating range. Fluoroelastomer seals are available as an option for chemical resistance, expanding application compatibility across diverse industrial environments.

Precision Regulators—Enhanced Control for Critical Applications

Precision regulators from ROSS feature innovative design geometry that ensures pressure settings held within ±3 psig of setpoint, delivering exceptional consistency for pneumatic tool operation and critical torque control applications. These regulators employ a small valve seat combined with a large diaphragm area, creating superior precision, sensitivity, and adjustment resolution compared to standard regulators.

Precision regulators are available in four series: Miniature (4 scfm), Full-Size (155 scfm), MD4TM (170 scfm), and High-Capacity (800 scfm). The internally piloted precision design provides improved torque control essential for pneumatic screwdrivers, impact wrenches, and automated fastening systems where consistent force application prevents component damage and ensures assembly quality.

All precision series feature diaphragm construction with self-relieving operation, inlet pressures to 300 psig, and adjustable outlet ranges from 15-250 psig. These regulators include standard gauges with 1/4-NPT gauge ports front and rear, enabling dual monitoring points for system diagnostics. Optional 0-200 or 0-60 psig gauge configurations allow optimization for specific application pressure windows.

Remote Pilot Regulators for Advanced System Control

Remote pilot regulators enable flexible, distributed pressure control across complex pneumatic systems, allowing a single pilot regulator to control multiple main regulators from a remote location. This architecture eliminates the need for multiple pressure adjustment points while maintaining precise synchronized pressure across multiple circuits.

ROSS offers remote pilot regulators in three capacity classes: Full-Size (155 scfm), MD4TM (190 scfm), and High-Capacity (4000 scfm). These regulators feature 1/4-NPTF pilot ports that accept signals from external adjustment regulators, providing responsive pressure variation without modifying the main regulator body. The high-relief variant includes secondary relief functionality, offering dual-mode operation for systems requiring both precise pilot control and emergency depressurization.

Remote pilot regulators incorporate self-relieving diaphragm design with inlet pressures to 300 psig and outlet adjustment ranges from 0-250 psig. The configuration enables innovative system architectures in automotive assembly, packaging machinery, and industrial automation where distributed valve control reduces panel space requirements and simplifies manifold design.

Relief Valves—System Overpressure Protection

Relief valves protect pneumatic systems from destructive overpressure conditions through precision-engineered pressure relief mechanisms. ROSS manufactures two primary relief valve series: Miniature (40 scfm) and High-Flow (450 scfm), each designed for specific system protection requirements.

Miniature relief valves operate across pressure ranges from 1-15 psig to 1-140 psig, suitable for low-pressure applications and sensitive pneumatic circuits. The diaphragm construction with small valve seat delivers precision relief cracking, preventing pressure spikes that would otherwise damage downstream equipment.

High-Flow relief valves support up to 450 scfm relief capacity, essential for protecting large-volume compressed air systems. These remote-pilot-operated units utilize a pilot regulator signal to control relief threshold, enabling sophisticated overpressure management in fill and circulation systems. The High-Flow design includes 1-NPT main port and 1/4-NPT pilot ports, facilitating integration with existing regulator networks.

Advanced Design Features and Configuration Options

All ROSS pressure regulators share engineered features that extend equipment life and ensure reliable long-term operation:

Two-Design Options: Piston designs maximize airflow for high-volume applications, while diaphragm designs provide superior response sensitivity for precision applications. Engineers select based on specific flow and response requirements.

Multiple Mounting Solutions: In-line nipple connections suit direct pipe installation, while modular designs enable stackable configurations for combined filter-regulator-lubricator (FRL) assemblies. Mounting bracket kits provide wall, panel, and manifold mounting flexibility.

Pressure Gauge Integration: All standard regulators include integrated gauges with front and rear 1/8" or 1/4" NPT gauge ports, enabling dual-point pressure monitoring and pressure transmitter integration for digital control systems.

Tamper-Resistant Design: Removable adjusting knobs and optional locking keys prevent unauthorized pressure adjustments, critical for manufacturing environments where process consistency directly impacts product quality and regulatory compliance.

Port Configuration Flexibility: Available port sizes from 1/8" to 3" accommodate systems ranging from microscale laboratory applications to large-volume industrial compressed air networks. NPT (National Pipe Thread) and G (ISO 228-1) thread options serve international applications.

Modular Assembly Architecture and Customization

The Mid-Size, Full-Size, and Bantam modular series enable custom FRL (Filter-Regulator-Lubricator) package configuration through stackable component design. Engineers combine regulators with filter and lubricator modules using specialized connector kits, creating integrated air preparation systems optimized for specific applications.

Modular assembly components include male and female port blocks for in-line connections, end plates for mounting flexibility, and multiple screw kits enabling single-unit or multi-unit configurations. Extra port blocks provide auxiliary 1/4-NPTF ports for pressure monitoring, sensing, or additional circuit control. The modular approach reduces assembly time, minimizes connection points prone to leakage, and simplifies maintenance through individual component replacement.

Pressure Range and Performance Specifications

ROSS pressure regulators operate across pressure windows carefully selected for specific applications and industries:

Low-Pressure Applications (0-50 psig): Ideal for sensitive pneumatic instruments, laboratory equipment, and low-pressure automation. Provides precise regulation without wasting energy through high pressure relief.

Standard Pressure Applications (0-100 to 0-150 psig): Accommodates most industrial manufacturing, packaging, and assembly processes. Offers performance optimization between pressure capability and component cost.

High-Pressure Circuits (0-200 to 0-250 psig): Supports demanding applications requiring higher force delivery from reduced cylinder sizes, common in aerospace component testing and industrial press systems.

Extreme-Pressure Applications (0-400+ psig): Enables specialized applications in aerospace propulsion, high-pressure testing, and industrial gas preparation systems.

Each pressure range includes models with matching gauge configurations, ensuring operators can clearly monitor actual system pressure against setpoint settings throughout the full operating window.

Material Construction and Environmental Ratings

ROSS pressure regulators utilize engineering materials carefully selected for durability across diverse industrial environments:

Body Materials: Aluminum construction reduces weight in modular assemblies, zinc-alloy bodies provide corrosion resistance in moist manufacturing environments, and acetal (polyacetal) components offer chemical compatibility with pneumatic system contaminants.

Seal Materials: Standard nitrile seals provide cost-effective performance across 40-175°F operating ranges, while optional fluoroelastomer seals extend temperature tolerance and offer superior chemical resistance for specialized applications.

Dome and Adjustment Components: Nylon knobs and caps provide ergonomic control while resisting corrosion from manufacturing coolants and cleaners. Aluminum dome options optimize performance in extended temperature operating ranges.

The 7-year warranty on all FRL components reflects ROSS's confidence in material selection and manufacturing quality, significantly exceeding industry standard warranty periods and supporting total cost of ownership calculations.

Accessories and Complementary Components

ROSS provides comprehensive accessory options extending regulator functionality and system integration capability:

Mounting Solutions: L-shaped metal brackets accommodate wall mounting of modular FRL packages. Pipe nipple brackets with varying sizes (1/4" to 1") enable flexible system layout. Panel mounting nuts facilitate control cabinet integration with quick-disconnect capability.

Port Adapter Kits: Female and male port blocks enable connections between modular and non-modular regulators, maximizing system flexibility. Tube port kits support metric 4-10mm tubing alongside standard NPT connections.

Modular Connection Clamps: Quick-disconnect clamps with integrated O-ring sealing simplify assembly and enable modular package reconfiguration without system pressure release.

Pressure Monitoring Accessories: Extra port blocks provide auxiliary 1/4-NPTF monitoring ports for pressure transmitters, digital gauges, or pilot control signal connections.

Application-Specific Regulator Selection

Successful regulator selection requires evaluating specific application requirements against regulator capabilities:

Pneumatic Tool and Assembly Equipment: Precision regulators with ±3 psig control maintain consistent fastening torque, preventing component damage and ensuring assembly quality. High-flow models support multiple simultaneous tool operation.

Food and Beverage Packaging: Metric G-thread port configurations with flush sealing prevent contamination risk. Clean-design modular architecture simplifies sanitization cycles and reduces machine downtime.

Automotive Assembly Lines: Remote pilot regulators enable distributed pressure zones across complex automation systems. Integrated gauges and monitoring ports support real-time process control and predictive maintenance.

Industrial Testing and Laboratories: High-pressure regulators support 400 psig operation for pressure vessel testing. Precision regulation maintains repeatable test conditions across experimental protocols.

Compressed Air System Integration: Right-Angle and High-Capacity in-line models integrate directly into existing infrastructure. Standard modular designs combine with filters and lubricators for complete air preparation.

Installation, Maintenance, and Regulatory Compliance

All ROSS pressure regulators require proper installation and maintenance for safe, reliable operation:

Pre-Installation Requirements: Systems must include air filtration with minimum 5-micron rating to prevent contamination affecting regulator valve seats and seals. Only petroleum-base lubricating oils with ISO 32 or lighter viscosity should be used in lubricated systems.

Energy Isolation and Safety: Before servicing any pneumatic component, all compressed air sources must be shut down, exhausted, and locked out per OSHA 1910.147 standards. Overhaul and service should only be performed by trained personnel with pneumatic equipment experience.

System Monitoring: Installation of pressure gauges, flow meters, and monitoring devices enables early identification of regulator degradation. Regular maintenance prevents reduced performance and energy waste from partially blocked cartridges or worn seals.

Compliance Standards: ROSS pressure regulators comply with international standards including ISO specifications for thread and port configurations. Optional sealing materials accommodate FDA food-processing and medical device applications.

Technical Data Summary

The FRL Pressure Regulators catalog includes complete technical specifications for every model:

• Flow Charts: Performance curves across complete outlet pressure range for each regulator series, enabling accurate sizing for specific system requirements
• Port Size Options: Comprehensive configurations from 1/8" to 3" for both NPT and G-thread standards
• Dimensional Drawings: Precise dimensions for panel mounting hole sizing, installation planning, and space constraint verification
• Pressure Range Documentation: Complete pressure capability specifications from 0 psig to 400+ psig
• Material Specifications: Detailed body, seal, and component material listings supporting compatibility verification
• Warranty Information: 7-year warranty coverage on all FRL components from date of purchase

Why Choose ROSS Controls Pressure Regulators

Industry-Leading Reliability: With manufacturing heritage extending across decades, ROSS pressure regulators power critical applications in automotive assembly, food processing, aerospace component testing, and industrial manufacturing globally.

Design Innovation: Dual design options (piston and diaphragm), modular architecture, and precision control ±3 psig enable engineers to optimize systems for specific performance, cost, and spatial requirements.

Comprehensive Product Range: From 4 scfm miniature models to 4000 scfm high-capacity systems, ROSS serves complete spectrum of compressed air applications without requiring multiple suppliers.

Global Support: With manufacturing facilities and sales representatives across Americas, Europe, Asia-Pacific, and India, ROSS provides local technical support, rapid spare parts access, and application engineering assistance worldwide.

Customization Capability: ROSS/FLEX® solutions repackage standard internal components into customer-specified configurations, reducing development time and life-cycle testing requirements while maintaining proven reliability.

Download the Complete Catalog

The FRL Pressure Regulators product catalog provides comprehensive technical data, performance specifications, and sizing guidance for all standard, precision, high-pressure, and remote pilot regulator models. Download the PDF document to access detailed flow charts, dimensional drawings, model numbering guides, and accessory listings essential for proper regulator selection and system integration.

Download PDF: FRL_Pressure_Regulators_ROSS.pdf