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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    The Precision Micro-Orifices® are constructedof brass or stainless steel withorifice sizes from .0003" to .005" diameter.The orifices are used to accurately metervery low flow rates of gases or liquids.Optional stainless steel screens are availableto protect the tiny orifices from minutecontamination particles.
Unit of Measure

Specifications

Material

 N/A 316 SS

Nominal Orifice Size

 N/A 4

CV

 N/A 0.0003490

Maximum Operating Pressure Gauge

 N/A 4000 psig

Accuracy

 N/A
    Standard Precision Micro-Orifices®are produced with very accurate characteristics and are production tested at an air supply pressure of 25 psig. The Flow Data tab lists the nominal flow at 25 psig and the accuracy of the measured flow for each orifice size.

Calibration

 N/A
    Measured air flow data is optionally available. Twenty flow data points, over the specified supply pressure range, are measured with NIST traceable instruments.

Custom Orifice Sizes

 N/A
    Custom orifice sizes, .0003" diameter and larger, can be produced to exacting air pressure and flow specifications. Using electronic pressure and flow measuring equipment that is NIST traceable, the custom Micro-Orifices® are produced to customer specifications. These custom orifices are available in types BLP, MLP, QXLP, IBLP, K4LP, IALP and Y2LPSS. A certificate of compliance to customer specifications is provided for all custom Micro-Orifices®. Contact factory for further details.

Optional Screens

 N/A
    Micro-Orifices® must be used with extremely clean fluids (filtered to .03 microns). Otherwise, there is a high probability of clogging the orifice with solid particles. Even with clean fluids, there is also the possibility of introducing contaminants during assembly of the fluid system. To minimize the possibility of clogging small orifices, it is recommended that screens be installed on the upstream and downstream sides of the orifice, to protect against handling contamination. Fifteen micron screens are normally used with Micro-Orifices®, to minimize contamination that occurs during handling or assembly. Screen material is stainless steel.

Ordering Information

 N/A
    Identify the part number of Micro-Orifices® using the complete detail on the chart at right. See examples also. For orifice assemblies without optional screens, use the base number only. For assemblies that include screens, add the suffixes shown in the table. Both inlet and outlet screens are rated for 15 microns.

Connection A

 N/A 1/4" OD Tube

Connection B

 N/A 1/4" OD Tube

Screened

 N/A None

Dimensions

Orifice Diameter

 N/A 0.0040 in

Total Length

 N/A 1.75 in

Outside Diameter

 N/A 0.250 in

Application

N/A

  • Precision metering of very low flow rates – gases or liquids
  • Standard for flow or leak rates
  • Accurate timing in pneumatic or hydraulic circuits
  • Flow limiting

Features

Features

 N/A
  • High temperature capability (Type BLP, IBLP, K4LP, IALP)
  • High pressure capability (Type BLP, K4LP, IBLP, IALP)
  • Bi-directional flow
  • High accuracy
  • NIST traceable
  • Optional in-line screens available (except Type IBLP, IALP)
  • Orifice calibration available

Features

 N/A
  • High temperature capability (Type BLP, IBLP, K4LP, IALP)
  • High pressure capability (Type BLP, K4LP, IBLP, IALP)
  • Bi-directional flow
  • High accuracy
  • NIST traceable
  • Optional in-line screens available (except Type IBLP, IALP)
  • Orifice calibration available

Flow Data

Air Flow at Pressure - Standard Cu. Cm. Per Minute (SCCM)

 N/A 5 psig: 90.6 cm³/min 10 psig: 133 cm³/min 15 psig: 164 cm³/min 20 psig: 194 cm³/min 25 psig: 220 cm³/min 30 psig: 250 cm³/min 40 psig: 309 cm³/min 50 psig: 369 cm³/min 60 psig: 428 cm³/min 70 psig: 487 cm³/min 80 psig: 542 cm³/min 90 psig: 602 cm³/min 100 psig: 662 cm³/min

Flow Accuracy at Pressure - Standard Cu. Cm. Per Minute (SCCM)

 N/A 25 psig: ± 20 cm³/min