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Flow data can be obtained at
GAS EQUIPMENT MillerWelds.com/flowdata

Smith Specialty Regulators

Our single- and dual-stage specialty gas regulators provide a high degree of accuracy and can be configured for
your unique specialty gas application. For our full specialty gas product offering visit MillerWelds.com.

HVAC/refrigeration purge/leak test regulator
Single-stage nitrogen regulator is specially designed to meet the specifications of HVAC refrigerant-purging
applications. This regulator is used with nitrogen to test HVAC systems to locate leaks and to purge an
area for installation and repair. It is economical, accurate and its compact size is useful where space is
limited. Covered by a one-year warranty.
2-inch (51 mm) gauges with shatter-resistant lenses and solid brass body for durability
Large durable nylon knob for easy pressure adjustment

Stock Number Gas Max. Delivery Pressure Max. Inlet Pressure Outlet Connection Inlet Connection
30-450-580 Nitrogen 450 psig (31 bar) 3,000 psig (207 bar) 7/16"-20 external flair fitting CGA 580

Heavy-duty high-pressure regulator
820 Series regulators are for use on cylinders with a wide variety of non-corrosive inert gases.
Typical applications include high-pressure testing, purging/charging, calibration kits, airline charging
carts, chemical plants, manufacturing processes, research/development and laboratories. Covered by
a two-year warranty.
824-0009 Piston-sensor design gives structural reliability in high-pressure use
Low-torque-control adjusting screw for easy pressure adjustments in closed/dead end systems
Due to specific configurations, we cannot accept returns of 820 Series regulators

Model Series Max. Delivery Pressure Max. Inlet Pressure Option 1 Outlet pressure Model Configuration Option 3 Inlet fittings / Max. CGA inlet pressure
823 500 psig 6,000 psig 823 0–500 psig 825 - 66 26 00 None —
824 0–1,000 psig 09 CGA 580 brass 3,000 psig
824 1,000 psig Note: Additional
825 0–2,000 psig Option 2 Outlet fittings 26 CGA 347 stainless steel 4,700 psig
825 2,000 psig inlet fittings
826 0–4,000 psig 00 None 27 CGA 677 stainless steel 6,400 psig
826 4,000 psig 827 0–6,000 psig 66 1/4" MNPT stainless steel 28 CGA 680 stainless steel 4,700 psig are available.
827 6,000 psig needle valve

Three-stage nitrogen low-pressure regulator
Preset regulators are specially designed to deliver a highly accurate and consistent 0.50 psig supply
of nitrogen to the head space of oil-filled power transformers. Available with or without electronic
pressure switch. Covered by a one-year warranty.
Built-in self-relieving valve set at 8 psig protects the system from over-pressurization due to
temperature variation
Rapid-fill bypass pressure valve allows rapid filling of the transformer with 6 psig of pressure
Pressure switch preset at 250 psig, but is adjustable from 70–300 psig using 3/32-inch Allen head
screw switch
Operation voltage amps at 12/24 volts DC or 125 volts AC: 3 amps at 250 volts
Switch wiring: Normally open or normally closed (DPDT), three 18-inch flying leads
16347-3 (with
pressure switch)

Stock Number Preset Outlet Pressure Delivery Pressure Bypass Rapid Max. Inlet Outlet Inlet Operating
16391 Without pressure switch 1st Stage 2nd Stage 3rd Stage Fill/Purge Pressure Connection Connection Temperature
16347-3 With pressure switch 150 psig (10 bar) 8 psig (0.6 bar) 0.4–0.6 psig (0.03–0.04 bar) 6 psig 3,000 psig 1/2" FNPT CGA 580 -40° to +180°F
into 2nd stage into 3rd stage into outlet (0.4 bar) (207 bar) (-40° to +82°C)
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