High-Relief Regulator High-Relief Regulator

Product Overview

The ROSS Controls is a bracket assembly kit (R-A37-381) designed for mounting ROSS High-Relief Pilot Operated Regulators to a vertical surface. High-relief pilot operated regulators are specialized high-capacity regulators used when precise downstream pressure control with fast high-volume pressure relief is required, in applications such as large pneumatic actuator supply, high-flow regulating stations, and process air pressure management.

The High-Relief Pilot Operated Regulator with 1/4-inch through 1-1/4-inch ports must be wall- or surface-mounted in a specific orientation for proper operation. The R-A37-381 bracket assembly provides the mechanical interface between the regulator body and the mounting surface, enabling secure vertical surface mounting without custom fabrication.

The Series bracket assembly is purpose-built for the ROSS High-Relief Pilot Operated Regulator product family. Standard FRL bracket kits (162, 167, 169 Series) are sized for standard Mid-Size and Full-Size FRL units and are not compatible with the larger, heavier High-Relief Pilot Operated Regulator body dimensions.

At $77.75 per kit, the R-A37-381 bracket assembly represents a precision-engineered mounting solution for a high-value piece of air preparation equipment. Proper mounting directly affects regulator performance: an incorrectly installed or unstable regulator mounting can introduce vibration and position errors that degrade pressure regulation accuracy and increase maintenance frequency.

Key Engineering Features

• Purpose-Engineered for High-Relief Regulator - The R-A37-381 bracket is specifically designed for the ROSS High-Relief Pilot Operated Regulator body with 1/4 to 1-1/4 inch ports, providing correct fit and stable mounting that standard FRL bracket kits cannot provide.
• Vertical Surface Mounting - Enables secure installation of the High-Relief Pilot Operated Regulator to a vertical wall, machine frame, or enclosure surface in the correct operating orientation for optimal performance.
• Stable High-Capacity Regulator Support - High-Relief Pilot Operated Regulators are heavier and larger than standard FRL regulators. The R-A37-381 bracket provides the structural support needed to hold this larger unit without deflection under operational pressure forces.
• Compatible with 1/4 through 1-1/4 Inch Port Regulators - The bracket assembly is rated for the full range of ROSS High-Relief Pilot Operated Regulator port sizes from 1/4 to 1-1/4 inches, providing a single part number for all sizes in the product family.
• Eliminates Custom Bracket Fabrication - The R-A37-381 bracket assembly eliminates the need for custom fabrication or adaptation of standard mounting hardware, reducing installation time and ensuring correct fit for the High-Relief Pilot Operated Regulator body geometry.
• Single-Part Procurement - The Series is a single model number (R-A37-381), simplifying ordering and spare parts stocking for facilities using High-Relief Pilot Operated Regulators throughout their pneumatic systems.

Technical Specifications

General Specifications

Temperature Ratings

The Series bracket is compatible with the High-Relief Pilot Operated Regulator operating temperature range.

Important: Temperature limits are determined by the High-Relief Pilot Operated Regulator unit installed. Verify regulator temperature ratings for the specific application.

Certifications & Compliance

Typical Applications & Industries

High-Flow Pneumatic Supply and Distribution

• High-Relief Pilot Operated Regulator mounted with R-A37-381 bracket at main header supply stations in large manufacturing facilities where precise downstream pressure regulation with high relief capacity is required at 3/4 to 1-1/4 inch ports.
• Pilot operated regulator mounted at individual machine supply risers in stamping or press operations where rapid pressure relief capability prevents over-pressure events during high-speed actuator cycling.
• High-flow regulator installations in centralized air preparation systems for multiple pneumatic circuit branches, where pilot-operated precision regulation is specified at supply points requiring bracket mounting.

Steel and Metal Processing

• High-Relief Pilot Operated Regulator bracket-mounted on steel mill pneumatic supply panels for control of large pneumatic cylinders on coil handling and forming equipment at 1-1/4 inch port supply.
• Pilot operated regulators bracket-mounted on furnace area supply headers where precise pressure regulation and fast relief response protect downstream actuators from pressure surges.
• Bracket-mounted High-Relief regulators in rolling mill pneumatic systems where 1 to 1-1/4 inch port regulators must be securely mounted in tight spaces with structural support for the larger regulator body.

Automotive and Assembly Manufacturing

• High-Relief Pilot Operated Regulator bracket-mounted at main pneumatic supply points in automotive body shops for supply to multiple stamping, welding, and handling circuits requiring precise main supply pressure regulation.
• Pilot operated regulator R-A37-381 mounted to machine frames in final assembly areas for regulated supply to complex pneumatic systems with multiple circuit branches and high instantaneous flow demand.
• Replacement bracket installations for High-Relief regulators during scheduled overhaul of automotive press line pneumatic supply systems.

Process and Chemical Manufacturing

• High-Relief Pilot Operated Regulator bracket-mounted at instrument air supply headers in process facilities where precise, responsive pressure regulation protects sensitive pneumatic instruments from supply pressure excursions.
• Pilot operated regulators bracket-mounted in compressed air distribution systems serving multiple large-bore actuators where precise, high-flow regulation at the point of use is more effective than relying on centralized supply pressure alone.

Ordering and Model Number Configuration

The Series High-Relief Regulator Bracket Assembly consists of a single model number R-A37-381. One bracket kit is required per High-Relief Pilot Operated Regulator installation.

Order one R-A37-381 bracket assembly per High-Relief Pilot Operated Regulator installation.

The R-A37-381 is compatible with High-Relief Pilot Operated Regulators with port sizes from 1/4 through 1-1/4 inches.

The Series R-A37-381 bracket is not interchangeable with standard FRL panel mount brackets (162, 166, 167 Series) or standard wall mount brackets (169 Series 915K77).

Contact ROSS Controls at (800) 438-7677 to confirm bracket compatibility with a specific High-Relief Pilot Operated Regulator model before ordering.

Accessories

High-Relief Pilot Operated Regulator Product Family

The R-A37-381 bracket assembly kit is designed for these ROSS High-Relief Pilot Operated Regulator products: available in 1/4, 3/8, 1/2, 3/4, 1, and 1-1/4 inch port sizes. Consult the ROSS FRL catalog or rosscontrols.com for the complete High-Relief Pilot Operated Regulator model number family.

Related Wall Mounting and Assembly Hardware

For standard Mid-Size and Full-Size FRL assemblies, use the following accessories.

Related Products & Accessories

• 169 Series Mid-Size and Full-Size Connector and Bracket Kit - Modular connector kit (892K77) and wall mount bracket assembly kit (915K77) for standard Mid-Size and Full-Size FRL assemblies. https://www.rosscontrols.com/en/series/169-mid-size-full-size
• 167 Series Mid-Size Bracket Kit - Panel mounting bracket kit for Mid-Size Series FRL units. https://www.rosscontrols.com/en/series/167-mid-size
• 172 Series Mid-Size and Full-Size Port Blocks - Female port blocks for supply and downstream piping connections. https://www.rosscontrols.com/en/series/172-mid-size-full-size
• 174 Series Differential Pressure Gauge - Filter element condition monitoring gauge for FRL assemblies. https://www.rosscontrols.com/en/series/174-differential-pressure-gauge
• 164 Series Electronically Controlled Drains - Timer-controlled electronic drain for FRL filter bowl condensate removal. https://www.rosscontrols.com/en/series/164-electronically-controlled-drains

Frequently Asked Questions (FAQ)

Q: What is the series R-A37-381 bracket used for?

A: The R-A37-381 is a bracket assembly kit specifically designed to mount ROSS High-Relief Pilot Operated Regulators to a vertical surface. It is not a standard FRL panel mount or wall mount kit - it is specific to the High-Relief Pilot Operated Regulator product family.

Q: Which ROSS regulator models require the R-A37-381 bracket?

A: The R-A37-381 is designed for the ROSS High-Relief Pilot Operated Regulator with 1/4 through 1-1/4 inch ports. Contact ROSS Controls at (800) 438-7677 or visit rosscontrols.com to identify the specific regulator model numbers compatible with this bracket.

Q: Can the R-A37-381 be used with standard piston-type regulators?

A: No. The R-A37-381 bracket is specifically engineered for the High-Relief Pilot Operated Regulator body geometry. Standard FRL piston-type regulators use different bracket kits (166, 167, 162 Series). Using the wrong bracket for a regulator unit results in an improper fit.

Q: What surface types is the R-A37-381 compatible with?

A: The R-A37-381 bracket is designed for mounting to vertical flat surfaces such as machine frames, structural steel, enclosure walls, and mounting plates. The installation surface must be able to support the weight of the regulator assembly and withstand the forces generated by inlet pressure.

Q: Is only one bracket required to mount a High-Relief Pilot Operated Regulator?

A: One R-A37-381 bracket assembly kit provides the mounting hardware for one High-Relief Pilot Operated Regulator. Contact ROSS Controls to confirm the number of brackets needed based on the specific regulator size and installation configuration.

Q: Why does the High-Relief Pilot Operated Regulator require a special bracket?

A: High-Relief Pilot Operated Regulators are larger and heavier than standard FRL regulators, and they operate on a pilot-operated principle that requires correct mounting orientation. Standard FRL bracket kits are dimensionally sized for smaller standard FRL regulators and cannot safely support the weight or body geometry of the high-relief unit.

Q: Can the R-A37-381 be used in horizontal mounting orientations?

A: The R-A37-381 is specified for vertical surface mounting. Consult ROSS Controls if a horizontal or non-standard mounting orientation is required for the High-Relief Pilot Operated Regulator, as operating orientation can affect regulator performance.

Q: Is the R-A37-381 available at ROSS distributors?

A: Yes, the R-A37-381 is available through the ROSS Controls distributor network. Contact ROSS at (800) 438-7677 for the nearest stocking distributor.

Q: What is the warranty on the R-A37-381 bracket?

A: The R-A37-381 carries the standard ROSS Controls one-year warranty covering defects in material and workmanship from date of purchase.

Q: Are installation instructions available for the R-A37-381?

A: Yes. Installation instructions for the High-Relief Pilot Operated Regulator mounting system are included in the ROSS FRL catalog (Form A10120), available at rosscontrols.com. Contact ROSS Controls at (800) 438-7677 for direct technical support.

Q: What tools are needed to install the R-A37-381?

A: Standard hand tools (wrenches) are needed to tighten the bracket mounting hardware. No special or proprietary tools are required for the bracket assembly installation.

Q: Is the R-A37-381 compatible with High-Relief Pilot Operated Regulators in G (BSPP) thread versions?

A: The bracket attaches to the regulator body and is independent of port thread type. The R-A37-381 should be compatible with both NPT and G (BSPP) thread versions of the High-Relief Pilot Operated Regulator. Confirm with ROSS Controls when ordering for a G-thread regulator.

Installation & Maintenance Guidelines

• Identify and confirm the mounting surface can support the weight of the High-Relief Pilot Operated Regulator assembly.
• Attach the R-A37-381 bracket assembly to the High-Relief Pilot Operated Regulator body following ROSS FRL catalog installation instructions for the specific regulator model.
• Mount the assembly to the vertical surface in the correct orientation using appropriate fasteners for the mounting surface material (not included in the R-A37-381 kit).
• Tighten all bracket fasteners to the specified torque values in the installation instructions.
• Connect supply inlet piping and downstream outlet piping to the regulator ports. Apply appropriate thread sealant to NPT connections.
• Connect the pilot supply line to the pilot port on the regulator following the pilot pressure specifications for the installed unit.
• Pressurize the system and verify all connections and the regulator mounting for leaks and stability before placing in service.
• Set the regulator outlet pressure to the desired set point following the adjustment procedure in the High-Relief Pilot Operated Regulator installation and operation instructions.

Warranty & Global Support

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

Global technical support available through ROSS offices in the USA, 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 technical data, dimensional drawings, and installation instructions for the High-Relief Pilot Operated Regulator and the R-A37-381 bracket, visit rosscontrols.com or contact ROSS at (800) 438-7677.

Download Catalog: https://www.rosscontrols.com/en/series/171-high-relief-regulator