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 27

CV

 N/A 0.017

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 0.027 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: 4.13 5 psig: 9.41 10 psig: 13.6 15 psig: 16.8 20 psig: 19.7 25 psig: 22.7 30 psig: 25.4 40 psig: 31.1 50 psig: 36.7 60 psig: 42.4 70 psig: 48.1 80 psig: 53.6 90 psig: 59.3 100 psig: 65.3

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

 N/A 5 In. Hg.: 6 10 In. Hg.: 7.59

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

 N/A 15 In. Hg.: 8.01 20 In. Hg.: 8.01 30 In. Hg.: 8.01

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

 N/A 1 psig (6.9 kPag): 1.95 5 psig (34.5 kPag): 4.44 10 psig (69.0 kPag): 6.43 15 psig (103.4 kPag): 7.95 20 psig (137.9 kPag): 9.28 25 psig (172.4 kPag): 10.7 30 psig (206.9 kPag): 12.0 40 psig (275.8 kPag): 14.7 50 psig (344.8 kPag): 17.3 60 psig (413.7 kPag): 20.0 70 psig (482.7 kPag): 22.7 80 psig (551.6 kPag): 25.3 90 psig (620.6 kPag): 28.0 100 psig (689.5 kPag): 30.8

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

 N/A 5 In. Hg. (127 Mm. Hg.): 2.83 10 In. Hg. (254 Mm. Hg.): 3.58

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

 N/A 15 In. Hg. (381 Mm. Hg.): 3.78 20 In. Hg. (508 Mm. Hg.): 3.78 30 In. Hg. (762 Mm. Hg.): 3.78

Water Flow - Gallons/minute (GPM)

 N/A 1 psig: 0.017 2 psig: 0.024 3 psig: 0.029 4 psig: 0.034 5 psig: 0.038 6 psig: 0.042 7 psig: 0.045 8 psig: 0.048 9 psig: 0.051 10 psig: 0.054 15 psig: 0.066 20 psig: 0.076 30 psig: 0.093 40 psig: 0.108 50 psig: 0.120 60 psig: 0.132 70 psig: 0.142 80 psig: 0.152 90 psig: 0.161 100 psig: 0.170

Water Flow - Liters/minute (LPM)

 N/A 1 psig (6.9 kPag): 0.064 2 psig (13.8 kPag): 0.091 3 psig (20.7 kPag): 0.111 4 psig (27.6 kPag): 0.129 5 psig (34.5 kPag): 0.144 6 psig (41.4 kPag): 0.144 7 psig (48.3 kPag): 0.170 8 psig (55.2 kPag): 0.182 9 psig (62.1 kPag): 0.193 10 psig (69 kPag): 0.203 15 psig (103.4 kPag): 0.249 20 psig (137.9 kPag): 0.288 30 psig (206.9 kPag): 0.352 40 psig (275.8 kPag): 0.407 50 psig (344.8 kPag): 0.455 60 psig (413.7 kPag): 0.498 70 psig (482.7 kPag): 0.538 80 psig (551.6 kPag): 0.576 90 psig (620.6 kPag): 0.610 100 psig (689.5 kPag): 0.644

Flow Data Status

 N/A Generic