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 42

CV

 N/A 0.039

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 0.042 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: 10.60 5 psig: 23.9 10 psig: 33.1 15 psig: 40.5 20 psig: 47.7 25 psig: 54.9 30 psig: 62.3 40 psig: 76.9 50 psig: 91.7 60 psig: 107 70 psig: 122 80 psig: 137 90 psig: 151 100 psig: 167

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

 N/A 5 In. Hg.: 15.4 10 In. Hg.: 19.2

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

 N/A 15 In. Hg.: 20.0 20 In. Hg.: 20.0 30 In. Hg.: 20.0

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

 N/A 1 psig (6.9 kPag): 4.99 5 psig (34.5 kPag): 11.3 10 psig (69.0 kPag): 15.6 15 psig (103.4 kPag): 19.1 20 psig (137.9 kPag): 22.5 25 psig (172.4 kPag): 25.9 30 psig (206.9 kPag): 29.4 40 psig (275.8 kPag): 36.3 50 psig (344.8 kPag): 43.3 60 psig (413.7 kPag): 50.3 70 psig (482.7 kPag): 57.4 80 psig (551.6 kPag): 64.5 90 psig (620.6 kPag): 71.5 100 psig (689.5 kPag): 78.6

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

 N/A 5 In. Hg. (127 Mm. Hg.): 7.29 10 In. Hg. (254 Mm. Hg.): 9.08

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

 N/A 15 In. Hg. (381 Mm. Hg.): 9.46 20 In. Hg. (508 Mm. Hg.): 9.46 30 In. Hg. (762 Mm. Hg.): 9.46

Water Flow - Gallons/minute (GPM)

 N/A 1 psig: 0.039 2 psig: 0.055 3 psig: 0.068 4 psig: 0.078 5 psig: 0.087 6 psig: 0.096 7 psig: 0.103 8 psig: 0.110 9 psig: 0.117 10 psig: 0.123 15 psig: 0.151 20 psig: 0.174 30 psig: 0.214 40 psig: 0.247 50 psig: 0.276 60 psig: 0.302 70 psig: 0.326 80 psig: 0.349 90 psig: 0.370 100 psig: 0.390

Water Flow - Liters/minute (LPM)

 N/A 1 psig (6.9 kPag): 0.148 2 psig (13.8 kPag): 0.209 3 psig (20.7 kPag): 0.256 4 psig (27.6 kPag): 0.295 5 psig (34.5 kPag): 0.330 6 psig (41.4 kPag): 0.362 7 psig (48.3 kPag): 0.391 8 psig (55.2 kPag): 0.418 9 psig (62.1 kPag): 0.443 10 psig (69 kPag): 0.467 15 psig (103.4 kPag): 0.572 20 psig (137.9 kPag): 0.660 30 psig (206.9 kPag): 0.809 40 psig (275.8 kPag): 0.934 50 psig (344.8 kPag): 1.044 60 psig (413.7 kPag): 1.144 70 psig (482.7 kPag): 1.235 80 psig (551.6 kPag): 1.320 90 psig (620.6 kPag): 1.401 100 psig (689.5 kPag): 1.476

Flow Data Status

 N/A Generic