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 41

CV

 N/A 0.038

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 0.041 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: 9.90 5 psig: 22.5 10 psig: 31.4 15 psig: 38.6 20 psig: 45.3 25 psig: 52.3 30 psig: 59.3 40 psig: 73.3 50 psig: 87.5 60 psig: 102 70 psig: 117 80 psig: 131 90 psig: 146 100 psig: 164

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

 N/A 5 In. Hg.: 14.5 10 In. Hg.: 18.0

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

 N/A 15 In. Hg.: 18.8 20 In. Hg.: 18.8 30 In. Hg.: 18.8

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

 N/A 1 psig (6.9 kPag): 4.67 5 psig (34.5 kPag): 10.6 10 psig (69.0 kPag): 14.8 15 psig (103.4 kPag): 18.2 20 psig (137.9 kPag): 21.4 25 psig (172.4 kPag): 24.7 30 psig (206.9 kPag): 28 40 psig (275.8 kPag): 34.6 50 psig (344.8 kPag): 41.3 60 psig (413.7 kPag): 48.1 70 psig (482.7 kPag): 55 80 psig (551.6 kPag): 61.9 90 psig (620.6 kPag): 68.9 100 psig (689.5 kPag): 77.3

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

 N/A 5 In. Hg. (127 Mm. Hg.): 6.82 10 In. Hg. (254 Mm. Hg.): 8.5

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

 N/A 15 In. Hg. (381 Mm. Hg.): 8.87 20 In. Hg. (508 Mm. Hg.): 8.87 30 In. Hg. (762 Mm. Hg.): 8.87

Water Flow - Gallons/minute (GPM)

 N/A 1 psig: 0.038 2 psig: 0.054 3 psig: 0.066 4 psig: 0.076 5 psig: 0.085 6 psig: 0.093 7 psig: 0.101 8 psig: 0.107 9 psig: 0.114 10 psig: 0.120 15 psig: 0.147 20 psig: 0.170 30 psig: 0.208 40 psig: 0.240 50 psig: 0.269 60 psig: 0.294 70 psig: 0.318 80 psig: 0.340 90 psig: 0.360 100 psig: 0.380

Water Flow - Liters/minute (LPM)

 N/A 1 psig (6.9 kPag): 0.144 2 psig (13.8 kPag): 0.203 3 psig (20.7 kPag): 0.249 4 psig (27.6 kPag): 0.288 5 psig (34.5 kPag): 0.322 6 psig (41.4 kPag): 0.352 7 psig (48.3 kPag): 0.381 8 psig (55.2 kPag): 0.407 9 psig (62.1 kPag): 0.432 10 psig (69 kPag): 0.455 15 psig (103.4 kPag): 0.557 20 psig (137.9 kPag): 0.643 30 psig (206.9 kPag): 0.788 40 psig (275.8 kPag): 0.910 50 psig (344.8 kPag): 1.017 60 psig (413.7 kPag): 1.114 70 psig (482.7 kPag): 1.203 80 psig (551.6 kPag): 1.287 90 psig (620.6 kPag): 1.365 100 psig (689.5 kPag): 1.438

Flow Data Status

 N/A Generic