O’Keefe Controls Co.
O’Keefe Controls Co.
4 Maple Drive
Monroe, CT 06468
Phone: 203.261.6711
Email: info@okeefecontrols.com • Website: www.okeefecontrols.com
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Unit of Measure

Specifications

Flow Direction

 N/A Metal Orifice Assemblies can be used for flow in either direction. The Air Flow and Water Flow data is for a flow direction as shown in the product images.

Material

 N/A 303 SS

Nominal Orifice Size

 N/A 21

CV

 N/A 0.0096

Orifice Geometry

 N/A Round

Maximum Operating Pressure

 N/A 4000 psig

Connection A

 N/A 3/8" NPT Male

Connection B

 N/A 3/8" NPT Male

Screened

 N/A None

Application

N/A

  • Precision Flow Control – Gases or Liquids
  • Speed Controls – Cylinders and Actuators
  • Accurate Timing in Pneumatic or Hydraulic Circuits
  • Flow Restriction
  • Accurate Throttling
  • Snubbers - Gages and Instruments
  • Ultrasonic Sound Sources

Advantages

N/A

  • High Pressure Capability
  • Bi-directional Flow Compatibility
  • Economical Precision Orifice
  • Repeatable Orifice Size and Shape
  • Predictable Flow Rate

Air Flow Notes

Air Flow Notes

 N/A Standard Conditions 70°F, 14.7 psia
SCFH – Standard Cu. Ft. Per Hour
SLPM – Standard Liters Per Minute
The Metal Orifice Air Flow data obtained with Type B restrictor.
Flow rates for other metal restrictors are essentially the same as for Type B.
The Metal Orifice Air Flow data supercedes previous publications.

Water Flow Notes

Water Flow Notes

 N/A The Metal Orifice Water Flow data calculated based on the Cv for each orifice. Flow = Cv √ΔP. ΔP = differential pressure in psid. It is assumed that the region on either side of the orifice is fully flooded with no air pockets.

Dimensions

Orifice Diameter

 N/A 0.021 in

Width Across Flats (Hex)

 N/A 11/16 in

Total Length

 N/A 1.47 in

Flow Data

Air Flow at Pressure - Standard Cu. Ft. Per Hour (SCFH)

 N/A 1 psig: 2.39 5 psig: 5.62 10 psig: 7.48 15 psig: 9.34 20 psig: 11.1 25 psig: 12.7 30 psig: 14.4 40 psig: 17.8 50 psig: 21.2 60 psig: 24.6 70 psig: 28.0 80 psig: 31.6 90 psig: 35.0 100 psig: 38.1

Air Flow at Vacuum - Standard Cu. Ft. Per Hour (SCFH)

 N/A 5 In. Hg.: 3.6 10 In. Hg.: 4.62

Air Flow at Vacuum, Choked Flow - Standard Cu. Ft. Per Hour (SCFH)

 N/A 15 In. Hg.: 4.92 20 In. Hg.: 4.92 30 In. Hg.: 4.92

Air Flow at Pressure - Standard Liters Per Minute (SLPM)

 N/A 1 psig (6.9 kPag): 1.13 5 psig (34.5 kPag): 2.65 10 psig (69.0 kPag): 3.53 15 psig (103.4 kPag): 4.41 20 psig (137.9 kPag): 5.22 25 psig (172.4 kPag): 6.01 30 psig (206.9 kPag): 6.81 40 psig (275.8 kPag): 8.42 50 psig (344.8 kPag): 10.0 60 psig (413.7 kPag): 11.6 70 psig (482.7 kPag): 13.2 80 psig (551.6 kPag): 14.9 90 psig (620.6 kPag): 16.5 100 psig (689.5 kPag): 18.0

Air Flow at Vacuum - Standard Liters Per Minute (SLPM)

 N/A 5 In. Hg. (127 Mm. Hg.): 1.70 10 In. Hg. (254 Mm. Hg.): 2.18

Air Flow at Vacuum, Choked Flow - Standard Liters Per Minute (SCFH)

 N/A 15 In. Hg. (381 Mm. Hg.): 2.32 20 In. Hg. (508 Mm. Hg.): 2.32 30 In. Hg. (762 Mm. Hg.): 2.32

Water Flow - Gallons/minute (GPM)

 N/A 1 psig: 0.010 2 psig: 0.014 3 psig: 0.017 4 psig: 0.019 5 psig: 0.021 6 psig: 0.024 7 psig: 0.025 8 psig: 0.027 9 psig: 0.029 10 psig: 0.030 15 psig: 0.037 20 psig: 0.043 30 psig: 0.053 40 psig: 0.061 50 psig: 0.068 60 psig: 0.074 70 psig: 0.080 80 psig: 0.086 90 psig: 0.091 100 psig: 0.096

Water Flow - Liters/minute (LPM)

 N/A 1 psig (6.9 kPag): 0.036 2 psig (13.8 kPag): 0.051 3 psig (20.7 kPag): 0.063 4 psig (27.6 kPag): 0.073 5 psig (34.5 kPag): 0.081 6 psig (41.4 kPag): 0.081 7 psig (48.3 kPag): 0.096 8 psig (55.2 kPag): 0.103 9 psig (62.1 kPag): 0.109 10 psig (69 kPag): 0.115 15 psig (103.4 kPag): 0.141 20 psig (137.9 kPag): 0.163 30 psig (206.9 kPag): 0.199 40 psig (275.8 kPag): 0.230 50 psig (344.8 kPag): 0.257 60 psig (413.7 kPag): 0.281 70 psig (482.7 kPag): 0.304 80 psig (551.6 kPag): 0.325 90 psig (620.6 kPag): 0.345 100 psig (689.5 kPag): 0.363

Flow Data Status

 N/A Generic