Miniature Series Port Sizes 1/8" & 1/4"; Flow to 40 scfm (1133 l/min)

Product Overview

The ROSS Controls is a family of miniature pressure regulators covering port sizes of 1/8" and 1/4" with a maximum flow capacity of 40 scfm (1133 l/min). Designed for compact pneumatic circuits, the series delivers reliable downstream pressure regulation in a small body envelope suited to space-constrained installations.

Both piston and diaphragm construction options are available. Piston construction is optimized for high air flow through the miniature body, while diaphragm construction provides faster pressure response and greater sensitivity to downstream pressure fluctuations. Both configurations are self-relieving, automatically exhausting excess downstream pressure when the set point is reduced.

The Miniature Series includes a pressure gauge for continuous outlet pressure monitoring and features a removable adjustment knob to prevent unauthorized set point changes after commissioning. The combination of small body size, dual construction options, and self-relieving operation makes the series a versatile choice for low-flow pneumatic applications across a range of industries.

Key Engineering Features

• Miniature Body Size - Compact housing accommodates 1/8" and 1/4" port sizes for installation in space-constrained pneumatic circuits and control panels.
• Piston and Diaphragm Options - Piston construction provides maximum flow through the miniature body; diaphragm construction delivers faster and more sensitive pressure response.
• Self-Relieving Operation - Automatically vents downstream pressure when set point is reduced, removing the requirement for a separate downstream relief valve in most applications.
• Maximum Flow 40 scfm (1133 l/min) - Higher flow capacity than the 112 Bantam Series at comparable port sizes, providing adequate capacity for applications with transient flow demands.
• Pressure Gauge Included - Integrated gauge gives continuous visual indication of regulated outlet pressure at the regulator body.
• Removable Tamper-Resistant Knob - After setting the outlet pressure, the adjustment knob can be removed to prevent unauthorized changes to the set point.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Automation and Assembly

• Low-flow actuator supply lines requiring precise, stable downstream pressure in compact machine designs.
• Instrument air supply circuits where 1/8" or 1/4" port sizes are appropriate for the connected device.
• Branch circuit pressure regulation in multi-zone pneumatic systems where each zone requires an independently set pressure.

Semiconductor and Electronics Manufacturing

• Precision air circuits in test and assembly equipment where stable regulated pressure is critical to process quality.
• Low-flow vacuum and pressure control in laboratory or clean room pneumatic systems.

Medical and Analytical Equipment

• Compact pneumatic circuits in medical devices or analytical instruments requiring miniature regulators with stable outlet pressure.

Ordering and Model Number Configuration

Related Products & Accessories

• Bantam Series Pressure Regulators - Compact modular-mount regulators with port sizes 1/8" to 3/8", flow to 23 scfm. https://www.rosscontrols.com/en/series/112-bantam-series
• 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
• Miniature Precision Series - Miniature precision regulators with diaphragm construction, port sizes 1/8" and 1/4", flow to 40 scfm. https://www.rosscontrols.com/en/series/120-miniature-precision-series

Frequently Asked Questions (FAQ)

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

A: The Miniature Series is available in 1/8" and 1/4" port sizes.

Q: What is the maximum flow capacity?

A: The Miniature Series has a maximum flow capacity of 40 scfm (1133 l/min).

Q: Is the series self-relieving?

A: Yes. All Miniature Series regulators are self-relieving, automatically venting excess downstream pressure when the set point is reduced.

Q: What construction options are available for the series?

A: Both piston and diaphragm construction are offered. Piston construction is used for maximum flow; diaphragm construction is used for faster, more sensitive pressure response.

Q: How does the Miniature compare to the 112 Bantam Series?

A: Both cover 1/8" and 1/4" port sizes. The Miniature Series has a higher maximum flow rating of 40 scfm compared to 23 scfm for the 112 Bantam Series. The 112 Bantam also offers modular mounting and quick connect fittings. Selection depends on flow requirements and mounting configuration.

Q: Does the series include a pressure gauge?

A: Yes. A pressure gauge is included as standard on the Miniature Series.

Q: How is tamper resistance achieved?

A: The adjustment knob is removable. After setting the desired outlet pressure, the knob can be pulled off to prevent unauthorized changes. Reinstalling the knob allows adjustment.

Q: What flow medium is this series designed for?

A: The Miniature Series is designed for filtered compressed air.

Q: Are 3D CAD models available for the series?

A: CAD model availability can be confirmed by visiting rosscontrols.com or contacting ROSS Controls at (800) 438-7677.

Q: Can the Miniature Series be used in a modular FRL assembly?

A: Contact ROSS Controls to confirm modular mounting compatibility for the series with other FRL components.

Q: Where can I find installation instructions?

A: Catalogs, installation instructions, and technical data for the Miniature Series are available on the ROSS Controls product page at rosscontrols.com or by calling (800) 438-7677.

Q: What is the recommended upstream filtration level?

A: Filtered compressed air is required. ROSS recommends appropriate upstream filtration to protect internal seating surfaces from particulate contamination.

Installation & Maintenance Guidelines

• Confirm upstream air filtration is installed before the Miniature Series regulator. Unfiltered air shortens internal component service life.
• Install with the inlet port connected to the supply side and the outlet port connected to the downstream circuit. Do not reverse flow direction.
• Apply thread sealant to port connections only on the male thread. Keep sealant away from the first two threads to prevent contamination of the internal passages.
• Set the outlet pressure before connecting downstream equipment by rotating the adjustment knob clockwise to increase pressure and counterclockwise to decrease it.
• Monitor the integrated gauge during adjustment to verify the outlet pressure matches the desired set point.
• Remove the adjustment knob after final set point is confirmed if tamper resistance is required for the installation.
• Verify self-relieving operation after installation by reducing the set point and confirming downstream pressure decreases.
• Do not exceed the maximum rated inlet pressure for the series regulator. Check the product datasheet for the specific inlet pressure rating.
• Mount the regulator so the gauge face is accessible for routine inspection from the normal maintenance position.
• After installation and initial pressurization, inspect all port connections for leaks using soapy water or an appropriate leak detection solution.
• Use tubing and fittings rated for the system operating pressure. Undersized or damaged tubing at the regulator outlet can introduce flow restrictions.
• If installation requires the regulator to be mounted in a non-standard orientation, confirm the orientation is acceptable per ROSS Controls installation documentation.

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, and installation documentation, visit the ROSS Controls product page or contact ROSS Controls directly.