Part Number E-63-SS, Orifice Assembly, Type E On O'Keefe Controls Co.

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Unit of Measure

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 303 SS
Nominal Orifice Size	N/A 63
C_V	N/A 0.088
Orifice Geometry	N/A Round
Maximum Operating Pressure	N/A 4000 psig
Connection A	N/A 1/4" NPT Male
Connection B	N/A 1/4" NPT Male
Screened	N/A None

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

N/A

High Pressure Capability
Bi-directional Flow Compatibility
Economical Precision Orifice
Repeatable Orifice Size and Shape
Predictable Flow Rate

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

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.

Orifice Diameter	N/A 0.063 in
Width Across Flats (Hex)	N/A 9/16 in
Total Length	N/A 1.38 in

Air Flow at Pressure - Standard Cu. Ft. Per Hour (SCFH)	N/A 1 psig: 25.9 5 psig: 55.3 10 psig: 74.6 15 psig: 90.3 20 psig: 106 25 psig: 122 30 psig: 138 40 psig: 170 50 psig: 202 60 psig: 233 70 psig: 267 80 psig: 298 90 psig: 331 100 psig: 362
Air Flow at Vacuum - Standard Cu. Ft. Per Hour (SCFH)	N/A 5 In. Hg.: 36.2 10 In. Hg.: 44.9
Air Flow at Vacuum, Choked Flow - Standard Cu. Ft. Per Hour (SCFH)	N/A 15 In. Hg.: 46.8 20 In. Hg.: 46.8 30 In. Hg.: 46.8
Air Flow at Pressure - Standard Liters Per Minute (SLPM)	N/A 1 psig (6.9 kPag): 12.2 5 psig (34.5 kPag): 26.1 10 psig (69.0 kPag): 35.2 15 psig (103.4 kPag): 42.6 20 psig (137.9 kPag): 50.1 25 psig (172.4 kPag): 57.7 30 psig (206.9 kPag): 65.2 40 psig (275.8 kPag): 80.3 50 psig (344.8 kPag): 95.4 60 psig (413.7 kPag): 110 70 psig (482.7 kPag): 126 80 psig (551.6 kPag): 141 90 psig (620.6 kPag): 156 100 psig (689.5 kPag): 171
Air Flow at Vacuum - Standard Liters Per Minute (SLPM)	N/A 5 In. Hg. (127 Mm. Hg.): 17.1 10 In. Hg. (254 Mm. Hg.): 21.2
Air Flow at Vacuum, Choked Flow - Standard Liters Per Minute (SCFH)	N/A 15 In. Hg. (381 Mm. Hg.): 22.1 20 In. Hg. (508 Mm. Hg.): 22.1 30 In. Hg. (762 Mm. Hg.): 22.1
Water Flow - Gallons/minute (GPM)	N/A 1 psig: 0.088 2 psig: 0.124 3 psig: 0.152 4 psig: 0.176 5 psig: 0.197 6 psig: 0.216 7 psig: 0.233 8 psig: 0.249 9 psig: 0.264 10 psig: 0.278 15 psig: 0.341 20 psig: 0.394 30 psig: 0.482 40 psig: 0.557 50 psig: 0.622 60 psig: 0.682 70 psig: 0.736 80 psig: 0.787 90 psig: 0.835 100 psig: 0.880
Water Flow - Liters/minute (LPM)	N/A 1 psig (6.9 kPag): 0.333 2 psig (13.8 kPag): 0.471 3 psig (20.7 kPag): 0.577 4 psig (27.6 kPag): 0.666 5 psig (34.5 kPag): 0.745 6 psig (41.4 kPag): 0.816 7 psig (48.3 kPag): 0.881 8 psig (55.2 kPag): 0.942 9 psig (62.1 kPag): 0.999 10 psig (69 kPag): 1.053 15 psig (103.4 kPag): 1.290 20 psig (137.9 kPag): 1.490 30 psig (206.9 kPag): 1.825 40 psig (275.8 kPag): 2.107 50 psig (344.8 kPag): 2.355 60 psig (413.7 kPag): 2.580 70 psig (482.7 kPag): 2.787 80 psig (551.6 kPag): 2.979 90 psig (620.6 kPag): 3.16 100 psig (689.5 kPag): 3.331
Flow Data Status	N/A Generic

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Flow Direction

Material

Nominal Orifice Size

CV

Orifice Geometry

Maximum Operating Pressure

Connection A

Connection B

Screened

C_V