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

 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

 Brass

Nominal Orifice Size

 20

CV

 0.0088

Orifice Geometry

 Round

Maximum Operating Pressure

 2000 psig

Connection A

 1/4" NPT Male

Connection B

 1/4" NPT Male

Screened

 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

 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

 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

 0.02 in

Width Across Flats (Hex)

 9/16 in

Total Length

 1.38 in

Flow Data

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

 1 psig: 2.22 5 psig: 5.23 10 psig: 6.70 15 psig: 8.50 20 psig: 10.3 25 psig: 11.8 30 psig: 13.4 40 psig: 16.5 50 psig: 19.6 60 psig: 22.7 70 psig: 25.9 80 psig: 29.0 90 psig: 32.2 100 psig: 35.2

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

 5 In. Hg.: 3.28 10 In. Hg.: 4.15

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

 15 In. Hg.: 4.64 20 In. Hg.: 4.64 30 In. Hg.: 4.64

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

 1 psig (6.9 kPag): 1.05 5 psig (34.5 kPag): 2.47 10 psig (69.0 kPag): 3.16 15 psig (103.4 kPag): 4.01 20 psig (137.9 kPag): 4.84 25 psig (172.4 kPag): 5.59 30 psig (206.9 kPag): 6.33 40 psig (275.8 kPag): 7.81 50 psig (344.8 kPag): 9.26 60 psig (413.7 kPag): 10.7 70 psig (482.7 kPag): 12.2 80 psig (551.6 kPag): 13.7 90 psig (620.6 kPag): 15.2 100 psig (689.5 kPag): 16.6

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

 5 In. Hg. (127 Mm. Hg.): 1.55 10 In. Hg. (254 Mm. Hg.): 1.96

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

 15 In. Hg. (381 Mm. Hg.): 2.19 20 In. Hg. (508 Mm. Hg.): 2.19 30 In. Hg. (762 Mm. Hg.): 2.19

Water Flow - Gallons/minute (GPM)

 1 psig: 0.009 2 psig: 0.012 3 psig: 0.015 4 psig: 0.018 5 psig: 0.020 6 psig: 0.022 7 psig: 0.023 8 psig: 0.025 9 psig: 0.026 10 psig: 0.028 15 psig: 0.034 20 psig: 0.039 30 psig: 0.048 40 psig: 0.056 50 psig: 0.062 60 psig: 0.068 70 psig: 0.074 80 psig: 0.079 90 psig: 0.083 100 psig: 0.088

Water Flow - Liters/minute (LPM)

 1 psig (6.9 kPag): 0.033 2 psig (13.8 kPag): 0.047 3 psig (20.7 kPag): 0.058 4 psig (27.6 kPag): 0.067 5 psig (34.5 kPag): 0.074 6 psig (41.4 kPag): 0.074 7 psig (48.3 kPag): 0.088 8 psig (55.2 kPag): 0.094 9 psig (62.1 kPag): 0.100 10 psig (69 kPag): 0.105 15 psig (103.4 kPag): 0.129 20 psig (137.9 kPag): 0.149 30 psig (206.9 kPag): 0.182 40 psig (275.8 kPag): 0.211 50 psig (344.8 kPag): 0.236 60 psig (413.7 kPag): 0.258 70 psig (482.7 kPag): 0.279 80 psig (551.6 kPag): 0.298 90 psig (620.6 kPag): 0.316 100 psig (689.5 kPag): 0.333

Flow Data Status

 Generic