Advanced Specialty Gas Equipment

Corrosive Gas Regulators Single Stage Model ARG

Model ARG
Aluminum, Single-Stage, Bar Stock Regulators

Model ARG is a single-stage regulator designed for use with Anhydrous Ammonia, Hydrogen Sulfide, Sulfur Dioxide and other gases compatible with aluminum. These regulators are ideal for applications requiring the light weight of an aluminum body regulator.

Warning: Do not use this regulator with Oxygen.

Standard Features
  • Aluminum Body can be used with certain gases not compatible with brass, without the expense associated with stainless steel.
  • Large effective diaphragm sensing area provides quick response, accurate and dependable regulation and long service life.
  • Filter traps foreign matter, extends regulator life and reduces maintenance.
  • Outlet Metering Valve provides flow control.
  • 1⁄8" NPT Female Bonnet Vent Port allows bonnet to be connected to a vent line or disposal system as a precaution in the unlikely event of a diaphragm failure.
Optional Features
  • Mounting Ring permits regulator to be panel mounted.
Maximum Inlet Pressure:
  ARG-3: 3000
  ARG-2: 800
  ARG-1: 300

Inlet Pressure Gauge

Delivery Pressure Range

Delivery Pressure Gauge

Gauge Size: 2" Dial

Operating Temp. Range: -15°F to 140°F

Flow Coefficient:
  Regulator: Cv = 0.06
  Outlet Valve: Cv = 0.35

Inlet Connection: CGA 290, 320, 330,
660 or 705 as ordered

Outlet Connection:   1⁄4" NPT female
  (on outlet valve)

Supply Pressure Effect: 1 psi per 100 psi

Approximate Weight: 3 lbs

Materials of Construction
Body: Aluminum Bar Stock
Outlet Valve and Gauges: Type 316 Stainless Steel
Bonnet: Electroless Nickel-Plated Aluminum
Other Metal Parts Exposed to Gas: Aluminum and Stainless Steel
Seats: PCTFE in regulator
Diaphragm: Type 316 Stainless Steel
Friction Sleeve: PTFE

Optional Equipment

Equipment Part No.
Panel Mounting Ring* PM3803
CGA 240-705 Adaptor* 0202-6102
Compression Fittings*  
  1⁄4" NPT female x 1⁄8" compression SG6733
  1⁄4" NPT female x 1⁄4" compression SG6734
  1⁄8" NPT male x 1⁄8" compression SG6960
  1⁄16" NPT male x 1⁄8" compression SG6711
Safety Mounting Brackets*  
Purge Assemblies* (cross purge assemblies are recommended)
* If selected, these items are not installed on the regulator. They are shipped as separate items.

Table I

Part No. Inlet Pressure   Delivery Pressure
Gauge (dual scale)   Range Gauge (dual scale)
(psig) (bar)   (psig) (psig) (bar)
ARG-3-30-(CGA) 0–4000 0–275   2–30 -30" Hg–0–60 -1–0–4
ARG-3-75-(CGA) 0–4000 0–275   4–75 -30" Hg–0–100 -1–0–7
ARG-3-150-(CGA) 0–4000 0–275   10–150 -30" Hg–0–200 -1–0–14
ARG-2-30-(CGA) 0–1000 0–69   2–30 -30" Hg–0–60 -1–0–4
ARG-2-75-(CGA) 0–1000 0–69   4–75 -30" Hg–0–100 -1–0–7
ARG-2-150-(CGA) 0–1000 0–69   10–150 -30" Hg–0–200 -1–0–14
ARG-1-30-(CGA) 0–400 0–27   2–30 -30" Hg–0–60 -1–0–4
ARG-1-75-(CGA) 0–400 0–27   4–75 -30" Hg–0–100 -1–0–7
ARG-1-150-(CGA) 0–400 0–27   10–150 -30" Hg–0–200 -1–0–14
Where “(CGA)” is indicated above, insert appropriate Compressed Gas Association connection number to complete the part number. Example: ARG-3-75-705. Order by complete part number.