Bantam Series Port Sizes 1/8" thru 3/8"; Flow to 23 scfm (651 l/min)

Product Overview

The ROSS Controls Bantam Series is a family of compact modular pressure regulators covering port sizes of 1/8", 1/4", and 3/8" with a maximum flow capacity of 23 scfm (651 l/min). The modular design allows the Bantam to connect directly to other Bantam Series FRL components (filters, lubricators) without additional fittings or pipe nipples, forming a complete air preparation assembly.

Two construction options are available: piston and diaphragm. Piston construction is optimized for maximum air flow through the compact Bantam body. Diaphragm construction provides faster pressure response and greater sensitivity to downstream pressure fluctuations, making it better suited for applications where regulated pressure must track load changes quickly.

Both piston and diaphragm models are self-relieving as standard. Non-relieving configurations are available by consulting ROSS. Port connection options include threaded NPT or G (BSPP) ports in 1/8" and 1/4" sizes, and quick-connect tube fittings for 1/4" and 3/8" tubing or metric tubing (4 mm, 6 mm, 8 mm, 10 mm), providing installation flexibility across a wide range of circuit configurations.

The Bantam Series includes an integrated pressure gauge rated to 0 to 160 psig (0 to 11 bar) with 1/8" gauge ports on both the front and rear of the body for bidirectional gauge installation. A removable adjusting knob provides tamper resistance after commissioning. The acetal body construction and 40 to 125 degrees F ambient temperature rating make the Bantam Series suitable for standard industrial environments.

Key Engineering Features

• Modular Mounting - Connects directly to other Bantam Series FRL components without additional fittings, forming compact integrated filter-regulator-lubricator assemblies.
• Piston and Diaphragm Construction Options - Piston design maximizes air flow through the compact Bantam body; diaphragm design provides faster and more sensitive downstream pressure response.
• Self-Relieving Standard - Automatically vents downstream pressure when the set point is reduced. Non-relieving option available by consulting ROSS Controls.
• Multiple Port Connection Styles - Threaded NPT and G (BSPP) ports in 1/8" and 1/4" sizes; quick-connect tube fittings for 1/4" and 3/8" tubing and metric tubing from 4 mm to 10 mm.
• Integrated Pressure Gauge - Included gauge rated 0 to 160 psig (0 to 11 bar) with 1/8" gauge ports on both front and rear of the body for installation flexibility.
• Removable Tamper-Resistant Knob - After setting the outlet pressure, the adjustment knob can be removed to prevent unauthorized changes to the set point during normal operation.
• Panel Mounting Option - Body includes a 1-3/16 inch (30 mm) panel mounting hole for direct panel installation without a separate bracket.
• Three Pressure Ranges - Available in 0 to 50 psig (0 to 3.4 bar), 0 to 100 psig (0 to 6.9 bar), and 0 to 125 psig (0 to 8.6 bar) regulated pressure ranges to match application requirements.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Automation and Assembly

• Low-flow pneumatic actuator supply lines requiring independently set downstream pressure in compact machine designs with modular FRL assembly.
• Pneumatic control panels using modular Bantam filter-regulator assemblies to consolidate air preparation in a single footprint.
• Instrument air supply circuits where 1/8" or 1/4" port sizes match the connected instrument's air requirements.
• Branch circuit regulation in multi-zone pneumatic systems where each zone requires independently set and tamper-resistant downstream pressure.

Packaging and Material Handling

• Labeling and printing machine actuators requiring regulated supply air at 1/8" or 1/4" port sizes within compact machine frames.
• Conveyor pneumatic brake and clutch circuits requiring modular FRL components in compact guarding enclosures.
• Small format cartoning and case erecting machines using modular Bantam assemblies for combined filtration and regulation.

Semiconductor and Electronics

• Pick-and-place actuators and vacuum generator supply in circuit board assembly equipment requiring 1/4" or smaller regulated air supply.
• Test fixture pneumatics for electronics functional testing where low-flow regulated air circuits must fit within space-constrained test enclosures.
• Clean room pneumatic circuits using diaphragm construction for more precise downstream pressure control in sensitive processes.

Medical and Dental Equipment

• Dental handpiece air supply regulation where precise, stable downstream pressure is critical to tool performance.
• Pneumatic actuators in diagnostic and laboratory equipment requiring compact modular air preparation in small enclosures.
• Medical device test stands using the diaphragm Bantam for faster pressure response during cyclical actuator testing.

General Industrial

• Panel-mounted air preparation stations using the 30 mm panel mounting hole for direct installation without supplemental brackets.
• Machine tool pneumatic circuits supplying workholding, part ejection, and air bearing functions at low flow rates.
• Quick-connect tubing circuits using metric tube fittings for compatibility with European pneumatic equipment standards.

Ordering and Model Number Configuration

Related Products & Accessories

• 111 Right Angle Series Pressure Regulators - Inline right-angle regulators with port sizes 1/8" to 1/2", flow to 55 scfm, threaded banjo or push-to-connect fittings. https://www.rosscontrols.com/en/series/111-right-angle-series
• 113 Miniature Series Pressure Regulators - Inline piston or diaphragm regulators with port sizes 1/8" and 1/4", flow to 40 scfm and higher inlet pressure rating. https://www.rosscontrols.com/en/series/113-miniature-series
• 114 Mid-Size Series Pressure Regulators - Modular-mount piston regulators with port sizes 1/4" to 1/2", flow to 100 scfm. https://www.rosscontrols.com/en/series/114-mid-size-series
• ROSS FRL Filters Bantam Series - Bantam Series particulate and coalescing filters for modular assembly with Bantam Series regulators. https://www.rosscontrols.com/en/categories/36-air-preparation-frls

Frequently Asked Questions (FAQ)

Q: What port sizes are available for the Bantam Series?

A: The Bantam Series is available in 1/8", 1/4", and 3/8" port sizes. Threaded NPT and G (BSPP) options are available in 1/8" and 1/4"; quick-connect tube fittings are available in 1/4" and 3/8" inch sizes and 4 mm through 10 mm metric sizes.

Q: What is the maximum flow capacity?

A: The Bantam Series has a maximum flow capacity of 23 scfm (651 l/min) at 100 psig (6.9 bar) inlet pressure.

Q: What is the maximum inlet pressure?

A: The maximum inlet pressure is 150 psig (10 bar). Exceeding this limit risks body damage and uncontrolled downstream pressure.

Q: What regulated pressure ranges are available?

A: Three regulated pressure ranges are available: 0 to 50 psig (0 to 3.4 bar), 0 to 100 psig (0 to 6.9 bar), and 0 to 125 psig (0 to 8.6 bar). Select the range appropriate for the downstream application.

Q: Should I choose piston or diaphragm construction?

A: Choose piston construction for maximum air flow through the compact Bantam body when flow capacity is the primary design criterion. Choose diaphragm construction when faster downstream pressure response and greater sensitivity to pressure fluctuations are required.

Q: Is the Bantam Series self-relieving?

A: Yes. The standard Bantam Series is self-relieving, automatically exhausting excess downstream pressure when the set point is reduced. Non-relieving configurations are available by consulting ROSS Controls.

Q: Does the Bantam include a pressure gauge?

A: Yes. A pressure gauge rated 0 to 160 psig (0 to 11 bar) is included with each regulator. The body has 1/8" gauge ports on both the front and rear, allowing the gauge to be installed on either side.

Q: How does the tamper-resistant knob work?

A: The adjustment knob is removable. After reaching the desired set point, pull the knob off the stem to prevent unauthorized adjustment. Reinstall the knob when adjustment is required.

Q: Can the Bantam be panel mounted?

A: Yes. The regulator body has a 1-3/16 inch (30 mm) panel mounting hole, allowing direct installation through a panel cutout without a separate mounting bracket.

Q: How does modular mounting work?

A: Bantam Series FRL components connect side-by-side using internal porting in the modular interface faces. No pipe nipples or intermediate fittings are needed between components. Consult ROSS for modular assembly hardware and port block options.

Q: What body material is used?

A: The body, dome, and knob are all constructed from acetal. Seals are nitrile. This material combination is suitable for standard industrial environments with compressed air as the flow medium.

Q: Are G (BSPP) thread models available?

A: Yes. G thread models are available by prefixing the model number with 'C' (e.g., C5B01C0010 for a 1/8" G piston regulator at 0 to 100 psig).

Q: What is the ambient temperature range?

A: The Bantam Series is rated for ambient temperatures from 40 to 125 degrees F (4 to 52 degrees C), suitable for standard industrial indoor environments.

Q: Can the Bantam be used with quick-connect metric tube fittings?

A: Yes. Bantam Series models are available with metric push-to-connect tube fittings in 4 mm, 6 mm, 8 mm, and 10 mm sizes for compatibility with European pneumatic circuit standards.

Installation & Maintenance Guidelines

• Confirm upstream air filtration is installed before the Bantam Series regulator. For modular assemblies, install a Bantam filter module upstream of the regulator module.
• Install with the inlet port connected to the supply side and the outlet port connected to the downstream circuit. Do not reverse flow direction through the regulator.
• For threaded port connections, apply thread sealant only to the male thread. Keep sealant away from the first two threads to prevent contamination of internal passages.
• For quick-connect tube fittings, insert tubing fully until it bottoms against the internal stop. Verify engagement by pulling the tube before pressurizing.
• Set the outlet pressure before connecting downstream equipment by rotating the adjustment knob clockwise to increase pressure and counterclockwise to decrease.
• Monitor the integrated gauge during adjustment to confirm the outlet pressure matches the desired set point.
• Remove the adjustment knob after final set point confirmation if tamper resistance is required for the installation.
• Verify self-relieving operation by reducing the set point and confirming downstream pressure decreases without requiring a separate exhaust valve.
• Do not exceed 150 psig (10 bar) inlet pressure. Exceeding this limit may damage the body or cause uncontrolled downstream pressure.
• For panel mounting, use a 1-3/16 inch (30 mm) hole and appropriate panel mounting hardware. Ensure the gauge is accessible from the normal maintenance position.
• In modular assemblies, ensure all modular interface connections are secure and sealed before pressurizing the assembly.
• Inspect all connections for leaks after initial pressurization using soapy water or an appropriate leak detection solution.

Warranty & Global Support

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

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

For product configuration, dimensional drawings, modular assembly documentation, and installation instructions, visit the ROSS Controls product page at rosscontrols.com or contact ROSS Controls directly.

Download Catalog: https://www.rosscontrols.com/en/series/112-bantam-series