Regulators Bantam Series Installation & Operating Instructions

Overview

ROSS Controls, founded in 1921 with over 100 years of leadership in fluid power, offers the Modular Regulators Bantam Series as a compact, lightweight pressure regulation solution for smaller-bore pneumatic systems and instrumentation applications. Available in piston or diaphragm construction, Bantam Series regulators are designed for port sizes from 1/8 to 3/8 inch and deliver flows up to 23 scfm — making them well-suited for applications where space is at a premium and flow demands are moderate.

The Bantam Series provides self-relieving operation (non-relieving option available — consult ROSS) and supports outlet pressures up to 100 psig (7 bar) with an inlet pressure rating of 150 psig (10 bar). The compact acetal body and dome construction minimizes weight while maintaining excellent chemical resistance for clean-air applications. Panel mounting requires a 1-3/16 inch (30 mm) cutout.

Install the unit as near as possible to the device it serves, upstream of any lubricators or valves in the line. Filters must be installed immediately upstream to ensure clean air supply. For questions, contact ROSS at 1-800-GET-ROSS or visit www.rosscontrols.com.

Key Features

Compact Piston or Diaphragm Construction

The Bantam Series offers both piston and diaphragm regulator configurations in the same compact body package. Piston regulators (red Adjusting Knob) provide stiffer pressure response and are preferred where outlet pressure stability under varying flow is critical. Diaphragm regulators (standard Adjusting Knob) offer softer pressure response and are suited to sensitive pneumatic instruments and low-flow applications. Both configurations share the same body, dome, cover, and knob parts.

Small Panel Footprint

Panel mounting requires only a 1-3/16 inch (30 mm) cutout, making the Bantam Series an ideal choice for compact control panels, small machine air preparation assemblies, and space-constrained installations. The small gauge ports (1/8 NPT) accept standard miniature pressure gauges calibrated 0 to 160 psig (0 to 11 bar).

Field-Adjustable Valve Seat Torque

The valve seat is removable and adjustable, torqued to 3-5 in-lbs (do not over-tighten). The dome is torqued to 60-70 in-lbs. These specific torque values are essential for proper regulator performance and must be observed when re-assembling after cleaning or valve replacement. Reducing spring load to zero by turning the adjusting knob counterclockwise before dome removal ensures safe disassembly.

Technical Specifications

Construction: Piston or Diaphragm, self-relieving (non-relieving optional)
Maximum Flow: 23 scfm
Ambient/Media Temperature: 40° to 125°F (4° to 52°C)
Fluid Media: Compressed air
Inlet Pressure: 150 psig (10 bar) maximum
Outlet Pressure: Adjustable up to 100 psig (7 bar)
Gauge Ports: 1/8 NPT, front and rear
Gauge Range: 0 to 160 psig (0 to 11 bar)
Panel Mounting: 1-3/16 inch (30 mm) hole required
Port Sizes: 1/8 to 3/8 inch NPT
Body, Dome, and Knob: Acetal
Seals: Nitrile
Valve Seat Torque: 3-5 in-lbs
Dome Torque: 60-70 in-lbs
Parts: Cover R-10R-15; Head R-10R-01M; Dome R-10R-02; Knob R-10R-62

Applications

Pneumatic Instruments and Sensors

Pneumatic instruments, sensors, and pilot signal circuits typically operate at low pressures and require consistent, stable supply pressure. The Bantam Series diaphragm model's precise pressure control at low flow rates makes it the ideal supply regulator for pneumatic transmitters, fluidic logic circuits, and pilot-operated solenoid valves in process control applications.

Small Machine Air Preparation Stations

Compact automation cells, robotic end-of-arm tooling, and small pneumatic fixtures benefit from the Bantam Series's combination of small size and reliable pressure regulation. The unit installs upstream of any lubricators or directional valves in the circuit and follows the flow direction indicated by the arrow on the regulator head.

Safety and Compliance Standards

Depressurize and lock out air pressure before any service or installation activity. The Bantam Series is rated for air service only; do not use with other gases or liquids without consulting ROSS. Compatible lubricants must be petroleum-based ISO 32 or lighter viscosity with aniline point between 180°F (82°C) and 220°F (104°C). Avoid phosphate-additive oils such as zinc dithiophosphate that damage nitrile seals.

Installation and Setup Guide

Installation Procedure

Step 1: Depressurize and lock out air pressure.
Step 2: Install in air line as near as possible to the device it serves; follow arrow on regulator head.
Step 3: Install a filter immediately ahead of the regulator for clean air supply.
Step 4: Mount Bantam upstream of any lubricators or directional valves.
Step 5: Install a pressure gauge or plug the gauge ports before pressurizing.
Step 6: Turn the adjusting knob clockwise to increase outlet pressure; counterclockwise to decrease.

Disassembly for Cleaning

Depressurize and lock out air pressure. Reduce spring load to zero (turn adjusting knob fully counterclockwise). Remove dome (counterclockwise rotation). Remove piston assembly or diaphragm assembly. Unscrew valve seat (A) to access the valve. Clean all parts with soap and water. Reassemble observing torque values: valve seat 3-5 in-lbs, dome 60-70 in-lbs. Ensure all seals are correctly located before closing the dome.

Why Choose ROSS Controls

ROSS Controls, founded in 1921 with over 100 years of leadership in fluid power, brings over a century of pneumatic expertise to every product. The Bantam Series provides trusted ROSS quality in a compact form factor, backed by worldwide distributor support and ROSS Technical Services at 1-800-GET-ROSS and www.rosscontrols.com.

Download This Document

PDF download: https://ross-admin-global-us-east.s3.amazonaws.com/production/uploads/document_language_file/file/199/ROSS_Regulator_Modular_Bantam_Series_SS-R001.pdf

Frequently Asked Questions

Q: What is the maximum inlet pressure for the Bantam Series?

A: 150 psig (10 bar) maximum. Do not exceed this value.

Q: What is the outlet pressure range?

A: Adjustable up to 100 psig (7 bar).

Q: What is the difference between piston and diaphragm Bantam models?

A: Piston models provide stiffer pressure response and better outlet pressure stability under varying flow. Diaphragm models offer softer response suitable for low-flow instrumentation applications.

Q: What torque should be applied to the valve seat and dome?

A: Valve seat: 3-5 in-lbs (do not over-tighten). Dome: 60-70 in-lbs.

Q: What is the maximum flow?

A: The Bantam Series is rated for up to 23 scfm.

Q: What materials are used in construction?

A: Body, Dome, and Knob are acetal. Seals are nitrile.

Q: Is a non-relieving version available?

A: Yes. Contact ROSS Controls for the non-relieving option.

Q: What gauge ports does the Bantam Series have?

A: 1/8 NPT gauge ports on front and rear, suitable for gauges calibrated 0 to 160 psig (0 to 11 bar).