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 Brass

Nominal Orifice Size

 N/A 38

CV

 N/A 0.032

Orifice Geometry

 N/A Round

Maximum Operating Pressure

 N/A 2000 psig

Connection A

 N/A 1/4" NPT Male

Connection B

 N/A 1/4" 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 0.038 in

Width Across Flats (Hex)

 N/A 9/16 in

Total Length

 N/A 1.38 in

Flow Data

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

 N/A 1 psig: 8.75 5 psig: 19.3 10 psig: 26.5 15 psig: 32.6 20 psig: 38.4 25 psig: 44.1 30 psig: 50.0 40 psig: 67.2 50 psig: 73.7 60 psig: 86.0 70 psig: 98.1 80 psig: 110 90 psig: 122 100 psig: 135

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

 N/A 5 In. Hg.: 12.3 10 In. Hg.: 15.4

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

 N/A 15 In. Hg.: 16.2 20 In. Hg.: 16.2 30 In. Hg.: 16.2

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

 N/A 1 psig (6.9 kPag): 4.13 5 psig (34.5 kPag): 9.09 10 psig (69.0 kPag): 12.5 15 psig (103.4 kPag): 15.4 20 psig (137.9 kPag): 18.1 25 psig (172.4 kPag): 20.8 30 psig (206.9 kPag): 23.6 40 psig (275.8 kPag): 31.7 50 psig (344.8 kPag): 34.8 60 psig (413.7 kPag): 40.6 70 psig (482.7 kPag): 46.3 80 psig (551.6 kPag): 52.1 90 psig (620.6 kPag): 57.8 100 psig (689.5 kPag): 63.7

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

 N/A 5 In. Hg. (127 Mm. Hg.): 5.81 10 In. Hg. (254 Mm. Hg.): 7.29

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

 N/A 15 In. Hg. (381 Mm. Hg.): 7.63 20 In. Hg. (508 Mm. Hg.): 7.63 30 In. Hg. (762 Mm. Hg.): 7.63

Water Flow - Gallons/minute (GPM)

 N/A 1 psig: 0.032 2 psig: 0.045 3 psig: 0.055 4 psig: 0.064 5 psig: 0.072 6 psig: 0.078 7 psig: 0.085 8 psig: 0.091 9 psig: 0.096 10 psig: 0.101 15 psig: 0.124 20 psig: 0.143 30 psig: 0.175 40 psig: 0.202 50 psig: 0.226 60 psig: 0.248 70 psig: 0.268 80 psig: 0.286 90 psig: 0.304 100 psig: 0.320

Water Flow - Liters/minute (LPM)

 N/A 1 psig (6.9 kPag): 0.121 2 psig (13.8 kPag): 0.171 3 psig (20.7 kPag): 0.210 4 psig (27.6 kPag): 0.242 5 psig (34.5 kPag): 0.271 6 psig (41.4 kPag): 0.297 7 psig (48.3 kPag): 0.320 8 psig (55.2 kPag): 0.343 9 psig (62.1 kPag): 0.363 10 psig (69 kPag): 0.383 15 psig (103.4 kPag): 0.469 20 psig (137.9 kPag): 0.542 30 psig (206.9 kPag): 0.663 40 psig (275.8 kPag): 0.766 50 psig (344.8 kPag): 0.857 60 psig (413.7 kPag): 0.938 70 psig (482.7 kPag): 1.013 80 psig (551.6 kPag): 1.083 90 psig (620.6 kPag): 1.149 100 psig (689.5 kPag): 1.211

Flow Data Status

 N/A Generic