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

 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

 303 SS

Nominal Orifice Size

 11

CV

 0.0028

Orifice Geometry

 Round

Maximum Operating Pressure

 4000 psig

Connection A

 1/4" NPT Male

Connection B

 1/4" 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

 0.011 in

Width Across Flats (Hex)

 9/16 in

Total Length

 1.38 in

Flow Data

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

 1 psig: 0.653 5 psig: 1.51 10 psig: 2.14 15 psig: 2.67 20 psig: 3.16 25 psig: 3.62 30 psig: 4.09 40 psig: 5.02 50 psig: 5.93 60 psig: 6.84 70 psig: 7.76 80 psig: 8.67 90 psig: 9.56 100 psig: 10.5

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

 5 In. Hg.: 0.953 10 In. Hg.: 1.20

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

 15 In. Hg.: 1.30 20 In. Hg.: 1.30 30 In. Hg.: 1.30

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

 1 psig (6.9 kPag): 0.308 5 psig (34.5 kPag): 0.71 10 psig (69.0 kPag): 1.01 15 psig (103.4 kPag): 1.26 20 psig (137.9 kPag): 1.49 25 psig (172.4 kPag): 1.71 30 psig (206.9 kPag): 1.93 40 psig (275.8 kPag): 2.37 50 psig (344.8 kPag): 2.80 60 psig (413.7 kPag): 3.23 70 psig (482.7 kPag): 3.66 80 psig (551.6 kPag): 4.09 90 psig (620.6 kPag): 4.51 100 psig (689.5 kPag): 4.94

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

 5 In. Hg. (127 Mm. Hg.): 0.450 10 In. Hg. (254 Mm. Hg.): 0.564

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

 15 In. Hg. (381 Mm. Hg.): 0.614 20 In. Hg. (508 Mm. Hg.): 0.614 30 In. Hg. (762 Mm. Hg.): 0.614

Water Flow - Gallons/minute (GPM)

 1 psig: 0.0028 2 psig: 0.0040 3 psig: 0.0048 4 psig: 0.0056 5 psig: 0.0063 6 psig: 0.0069 7 psig: 0.0074 8 psig: 0.0079 9 psig: 0.0084 10 psig: 0.0089 15 psig: 0.0108 20 psig: 0.0125 30 psig: 0.0153 40 psig: 0.0177 50 psig: 0.0198 60 psig: 0.0217 70 psig: 0.0234 80 psig: 0.0250 90 psig: 0.0266 100 psig: 0.0280

Water Flow - Liters/minute (LPM)

 1 psig (6.9 kPag): 0.0106 2 psig (13.8 kPag): 0.0150 3 psig (20.7 kPag): 0.0184 4 psig (27.6 kPag): 0.0212 5 psig (34.5 kPag): 0.0237 6 psig (41.4 kPag): 0.0237 7 psig (48.3 kPag): 0.0280 8 psig (55.2 kPag): 0.0300 9 psig (62.1 kPag): 0.0318 10 psig (69 kPag): 0.0335 15 psig (103.4 kPag): 0.0411 20 psig (137.9 kPag): 0.0474 30 psig (206.9 kPag): 0.0581 40 psig (275.8 kPag): 0.0670 50 psig (344.8 kPag): 0.0749 60 psig (413.7 kPag): 0.0821 70 psig (482.7 kPag): 0.0887 80 psig (551.6 kPag): 0.0948 90 psig (620.6 kPag): 0.1006 100 psig (689.5 kPag): 0.1060

Flow Data Status

 Generic