
PRESSURE REGULATORS 
Port Size: 1/4" 
Spring Range: 0.3 to 7 bar (5 to 100 psig)
Inlet Pressure: 7 bar (100 psig)
Typical Performance Chart, R44
Air Flow Characteristics
Air Flow
Outlet Pressure
8
6
4
2
0
 bar 
100
80
60
40
20
0
 psig
0     4     8     12    16     20     scfm
0     4      8     12     16     20   dm3/s
28 (1.1)
Models R44-100/-200 and R44-121/-221 
(Aluminum or Brass Body 
and Plastic Bonnet)
73 (2.86)
63 (2.46)
23 (0.91)
Models R44-133/-233
(Brass Body and 
Brass Bonnet)
38 (1.50)
87 (3.41)
26 (1.03)
77 (3.01)
38 (1.50)
FOR COMPRESSED AIR, 
CARBON DIOXIDE 
AND INERT GASES
R44 Series
Starts at
$
40
R44-221-RNEA, $40, 
shown actual size.
l Compact Design  
l High/Low Pressure Models for Primary/
Secondary Regulation
l Plastic Locking Knob for Fast and Easy Adjustment 
l Regulate Output Pressure From 0.1 to 12 bar 
(1 to 175 psig)
l Standard Relieving Models Allow Reduction of
Outlet Pressure When System is Dead-Ended
l Panel or Bracket Mount
The R44 Series are industrial pressure regulators for use with 
compressed air and inert gases such as carbon dioxide, argon 
helium, krypton, neon nitrogen and xenon. The R83 models are for 
primary high pressure regulation, while the R44 models are for 
secondary low pressure regulation. These regulators are intended 
for industrial use and are not to be used for beverage 
dispensing applications.
Dimensions: mm (in)
SPECIFICATIONS 
R44 MODELS 
Operating Temperature: -34 to 66ºC (-30 to 150ºF) 
Maximum Inlet Pressure: 17 bar (250 psig)  
Materials R44:
R44-221: Brass body; acetal plastic bonnet 
R44-233: Brass body, brass bonnet
Valve: Brass/nitrile  
Seat: Acetal  
Elastomers: Nitrile
R83 MODELS 
Operating Temperature: -34 to 60ºC (-30 to 140ºF) 
Maximum Inlet Pressure: 207 bar (3000 psig)  
Materials R88: Brass body, zinc bonnet 
Cartridge Valve: PTFE, brass, stainless steel 
Diaphram: Acetal/nitrile 
Seals: Nitrile
C-1

Port Size: 1/4" 
Spring Range: 0.3 to 8.5 bar (5 to 125 psig)
Inlet Pressure: 69 bar (1000 psig)
Flow
Outlet Pressure
8
6
4
2
0
bar 
100
80
60
40
20
0
 psig
Typical Performance Chart, R83
Flow Characteristics - CO
2
0       2       4       6       8     10     12 scfm
0       1       2       3       4     5     dm3/s
Mounting Holes (2 Places)
4.6 (0.18) dia. by 
10 (0.39) deep. 
Use 10-32 thread forming screws.
42 (1.66)
30º
R83-200-RNLA, $65, shown 
smaller than actual size.
Dimensions: mm (in)
To Order (Specify Model Number)
MODEL NO. PRICE
R44-221-RNAA $40   
R44-221-RNEA 40
R44-221-RNKA 40   
R44-233-RNAA 45   
R44-233-RNEA 45   
R44-233-RNKA 45   
R83-200-RNEA 65    
R83-200-RNLA 65    
R83-200-RNNA 65   
ACCESSORIES
MODEL NO. PRICE DESCRIPTION
OM-AIR-18-025-003   $7.00   Wall bracket for R44 low pressure regulators 
OM-AIR-2962-04    3.50   Panel nut for R44 low regulators
Ordering Examples: R44-221-RNEA, low pressure regulator for inert gasses with plastic locking knob for pressure range of 0.3 to 3.5 bar 
(5 to 50 psig), OM-AIR-18-013-211, pressure gauge 0 to 4 bar (0 to 60 psig), and OM-AIR-18-025-003, wall bracket for R44 regulator, $40 + 14 + 7 = $61.
R83-200-RNNA, high pressure regulator for inert gasses with pressure range 0.7 to 12 bar (10 to 175 psig), and OM-AIR-18-013-209, pressure 
gauge for 0 to 11 bar (0 to 160 psig), R44-233-RNAA, low pressure regulator with brass adjusting screw for pressure range of 0.1 to 0.7 bar 
(1 to 10 psig), and OM-AIR-18-013-214, pressure gauge for 0 to 2 bar (0 to 30 psig), $65 + 45 + 14 = $124.
OM-AIR-5095-51    7.00   Neck bracket for R83 high pressure regulators 
OM-AIR-18-013-214   14.00   40 mm (1.5") pressure gauge with  
OM-AIR-18-013-211   14.00   40 mm (1.5") pressure gauge with  
OM-AIR-18-013-212  13.25  40 mm (1.5") pressure gauge with  
OM-AIR-18-013-208   14.00   50 mm (2") pressure gauge with  
OM-AIR-18-013-209   13.00   50 mm (2") pressure gauge with 
INLET/OUT GAUGE PORT 
PORT (in) PORT (in)
1
⁄4
1
⁄
4
1
⁄
4
1
⁄
4
1
⁄4
1
⁄
4
1
⁄4
1
⁄4
1
⁄4
1
⁄8
1
⁄
8
1
⁄
8
1
⁄
8
1
⁄8
1
⁄
8
1
⁄4 High pressure regulator, 0.1 to 3.5 bar (2 to 50 psig)
1
⁄4 High pressure regulator, 0.3 to 8.5 bar (5 to 125 psig)
1
⁄4 High pressure regulator, 0.7 to 12 bar (10 to 175 psig)
MOST POPULAR MODELS HIGHLIGHTED!
DESCRIPTION
Low pressure regulator with plastic locking knob, 
0.1 to 0.7 bar (1 to 10 psig) 
Low pressure regulator with plastic locking knob, 
0.3 to 3.5 bar (5 to 50 psig) 
Low pressure regulator with plastic locking knob, 
0.3 to 7 bar (5 to 100 psig) 
Low pressure regulator brass adjusting screw, 
0.1 to 0.7 bar (1 to 10 psig) 
Low pressure regulator brass adjusting screw, 
0.3 to 3.5 bar (5 to 50 psig) 
Low pressure regulator brass adjusting screw, 
0.3 to 7 bar (5 to 100 psig)
1
NPT, 0 to 2 bar (0 to 30 psig)
⁄
8
1
NPT, 0 to 4 bar (0 to 60 psig)
⁄
8
1
NPT, 0 to 7 bar (0 to 100 psig)
⁄
8
1
NPT, 0 to 4 bar (0 to 60 psig)
⁄
4
1
NPT, 0 to 11 bar (0 to 160 psig)
⁄
4
C-2

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