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
Print Back
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

 28

CV

 0.018

Orifice Geometry

 Round

Maximum Operating Pressure

 2000 psig

Connection A

 1/8" NPT Male

Connection B

 1/8" 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

 0.028 in

Width Across Flats (Hex)

 7/16 in

Total Length

 0.970 in

Flow Data

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

 1 psig: 4.68 5 psig: 10.5 10 psig: 15.2 15 psig: 18.6 20 psig: 21.8 25 psig: 24.8 30 psig: 28.0 40 psig: 34.1 50 psig: 40.3 60 psig: 46.4 70 psig: 52.5 80 psig: 58.7 90 psig: 65.0 100 psig: 71.4

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

 5 In. Hg.: 6.7 10 In. Hg.: 8.48

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

 15 In. Hg.: 8.90 20 In. Hg.: 8.9 30 In. Hg.: 8.90

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

 1 psig (6.9 kPag): 2.21 5 psig (34.5 kPag): 4.94 10 psig (69.0 kPag): 7.18 15 psig (103.4 kPag): 8.78 20 psig (137.9 kPag): 10.3 25 psig (172.4 kPag): 11.7 30 psig (206.9 kPag): 13.2 40 psig (275.8 kPag): 16.1 50 psig (344.8 kPag): 19.0 60 psig (413.7 kPag): 21.9 70 psig (482.7 kPag): 24.8 80 psig (551.6 kPag): 27.7 90 psig (620.6 kPag): 30.7 100 psig (689.5 kPag): 33.7

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

 5 In. Hg. (127 Mm. Hg.): 3.16 10 In. Hg. (254 Mm. Hg.): 4.00

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

 15 In. Hg. (381 Mm. Hg.): 4.20 20 In. Hg. (508 Mm. Hg.): 4.20 30 In. Hg. (762 Mm. Hg.): 4.20

Water Flow - Gallons/minute (GPM)

 1 psig: 0.018 2 psig: 0.025 3 psig: 0.031 4 psig: 0.036 5 psig: 0.040 6 psig: 0.044 7 psig: 0.048 8 psig: 0.051 9 psig: 0.054 10 psig: 0.057 15 psig: 0.070 20 psig: 0.080 30 psig: 0.099 40 psig: 0.114 50 psig: 0.127 60 psig: 0.139 70 psig: 0.151 80 psig: 0.161 90 psig: 0.171 100 psig: 0.180

Water Flow - Liters/minute (LPM)

 1 psig (6.9 kPag): 0.068 2 psig (13.8 kPag): 0.096 3 psig (20.7 kPag): 0.118 4 psig (27.6 kPag): 0.136 5 psig (34.5 kPag): 0.152 6 psig (41.4 kPag): 0.152 7 psig (48.3 kPag): 0.180 8 psig (55.2 kPag): 0.193 9 psig (62.1 kPag): 0.204 10 psig (69 kPag): 0.215 15 psig (103.4 kPag): 0.264 20 psig (137.9 kPag): 0.305 30 psig (206.9 kPag): 0.373 40 psig (275.8 kPag): 0.431 50 psig (344.8 kPag): 0.482 60 psig (413.7 kPag): 0.528 70 psig (482.7 kPag): 0.570 80 psig (551.6 kPag): 0.609 90 psig (620.6 kPag): 0.646 100 psig (689.5 kPag): 0.681

Flow Data Status

 Generic