Technical data
48
Regulators
Heavy Duty Single Stage Series 40™ Regulators
ACCESSORIES
Check Valves
see page 68
Flashback
Arrestors
see page 67
HB190 
“Hard Hat”™
Gauge/Regulator
Guards
see page 70
BRASS CONSTRUCTION FOR DEPENDABLE
SERVICE IN CORROSIVE ATMOSPHERES
Series 40™ single stage regulators comprise a
complete line of versatile regulators for welding,
cutting, heating and other industrial applications.
Heavy duty construction and simplified design
provides high gas flow and longer trouble-free
operation. Stainless steel diaphragm allows use
with liquid gases.
Other Gases
Stock Gas Delivery Gauges (2-1/2”/64mm Dia.) Inlet Outlet Max
Number Used
Pressure Inlet Outlet Connection Connection Inlet Pressure
40-275-580 Nitrogen 0-275 PSIG 4000 PSIG 400 PSIG CGA 580 5/8”-18 RH 3000 PSIG
0-19 Bar 276 Bar 28 Bar  Internal 207 Bar
Propane, Propylene & Natural Gas Regulators
Stock Gas Delivery Gauges (2-1/2”/64mm Dia.) Inlet Outlet Max
Number Used
Pressure Inlet Outlet Connection Connection Inlet Pressure
40-50-510 LP Gas 0-50 PSIG 400 PSIG 60 PSIG CGA 510 9/16”-18 LH 400 PSIG
0-3 Bar 28 Bar 4 Bar “B” 28 Bar
* 
Includes HB190 “Hard Hat™” Gauge Guard.
3 Year
Limited
Warranty
Acetylene Regulators
Stock Gas Delivery Gauges (2-1/2”/64mm Dia.) Inlet Outlet Max
Number Used
Pressure Inlet Outlet Connection Connection Inlet Pressure
40-15-300 Acetylene 0-15 PSIG 400 PSIG 30 PSIG CGA 300 9/16”-18 LH 400 PSIG
40-15-300S
* 0-1 Bar 28 Bar 2 Bar “B” 28 Bar
40-15-510 CGA 510
40-15-510S
*
Oxygen Regulators
Stock Gas 
Delivery Gauges (2-1/2”/64mm Dia.) Inlet Outlet Max
Number Used
Pressure Inlet Outlet Connection Connection Inlet Pressure
40-175-540 Oxygen 0-175 PSIG 4000 PSIG 200 PSIG CGA 540 9/16”-18 RH 3000 PSIG
40-175-540S*
0-12 Bar 276 Bar 14 Bar “B” 207 Bar
40-275-540
6-275 PSIG 400 PSIG
0-19 Bar 14 Bar
Regulator
With Hard Hat™
Regulators
Flowmeters
Flow Data & Cross Reference
to old model numbers
available on Smith Website
under Tech & Safety Info.
smithequipment.com
PART# DEFINITION
Example: 40-15-510
40 SERIES
15 MAXIMUM OUTLET PRESSURE
510 CYLINDER CGA CONNECTION










