2 | Baker Hughes
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Table 1
Materials of Construction
Series 21 and 21S
Body & Spring
Housing
Forged Brass or Stainless Steel
Body Insert &
Closing Cap
Brass or Stainless Steel
Orifice
Stainless Steel or Delrin
Plug & Stem
Nitrile Stainless Steel
Diaphragm
Nitrile/Nylon or Viton/Nylon
O-Rings
Nitrile or Viton
Figure 1
Series 21 & 21S
Cartridge
Bottom View all
Constructions
Series 21H & 21HS
4
3
2
2
1A
1
Table 2
Specifications
All Series 21 Regulators
Control Application
Pressure Reducing (PRV)
Orifice Size
.125 in (3.175 mm)
Connections
1/4 in NPTF
Temperature
Working -20°F to 150°F
(-28°C to 65.7°C)Emergency
-40°F to 200°F
(-40°C to 93. 3°C)
Maximum Inlet Pressure
1500 psig (100 bar)
Maximum Outlet Pressure
1000 psig (70 bar)
Maximum Emergency
Sensing Pressure
1000 psig (70 bar)
Maximum SpringHousing
Pressure
1000 psig (70 bar)
Set Pressure Range
3-900 psig (0.2 - 62 bar)
1
1
Refer to Table 3 for specific spring ranges.
