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Dual Sealing AFO Plug

Dual Sealing AFO Plug

Dual Sealing AFO Plug

Product catalog summary
Product Overview
The Lee Dual Sealing A.F.O.® Plug is designed for high-pressure applications, providing a leaktight metal-to-metal seal. It features an O-ring with backup rings for venting or charging, allowing pressure to be vented from a side port to remove air or release trapped gas. The plug is made from materials compliant with NACE specification MR0175, suitable for aggressive wellbore fluids.

Key Features
  • Seals up to 50,000 psi when closed and rated to 15,000 psi when open.
  • Reusable design for easy access to sealed passageways.
  • Temperature rating of 400°F.
  • Floating seal self-aligns to prevent galling.
  • Includes O-ring and backup rings.

Materials
  • Body and Nose: MP35N Chemistry, Heat Treat per NACE MR0175.
  • O-Ring: FKM, 90 Durometer.
  • Backup Rings: PEEK.

Installation and Coining Procedure
The installation involves coining the seat using a specific tool and lubricating the O-ring for protection. The A.F.O. Plug is installed by hand and tightened to specified torque values depending on the housing material. Coining tools are marked for precise rotation measurement, and Mobilgrease 28 is recommended for lubrication.

Installation Torques
  • 2024-T4 AI: 75 in.lbs for PLAA3124220A, 100 in.lbs for PLAA3724220A, 25 ft. lbs for PLAA5020220A.
  • 416 SS and AISI 8630: 90 in.lbs for PLAA3124220A, 220 in.lbs for PLAA3724220A, 30 ft. lbs for PLAA5020220A.

Additional Considerations
Additional torque may be required if the O-ring is sealing pressure before the plug is seated at the nose seal. The torque needed will correspond to the force necessary to overcome the pressure sealed by the O-ring.
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Catalog excerpts

Dual Sealing AFO Plug-1

DUAL SEALING A.F.O.® PLUG The Lee Dual Sealing A.F.O. (Axial Force Only) Plug offers a leaktight, metal to metal seal for high pressure applications and also incorporates an O-ring with backup rings for venting or charging. Pressure can be vented out of a side port to remove air from a hydraulic system or safely release trapped high pressure gas. With two backup rings, the Dual Sealing A.F.O. can handle high pressure from either end while in the open position. Machined from materials compliant with NACE specification MR0175, the plug can easily handle a wide range of aggressive wellbore fluids. Dual Sealing A.F.O. Plugs are designed to be both removable and reusable, featuring a unique floating seal that self-aligns to allow for threaded holes that are not perfectly concentric with the thru-hole. Also, the sealing elements resist rotation during installation, which prevents galling of the seat. Incorporating threaded retention, Dual Sealing A.F.O. Plugs only impart axial force on the housing, allowing for minimal wall thickness. For additional information and technical assistance, please visit our website to contact a local Lee Sales Engineer. ■ Seals to 50,000 psi closed ■ Rated to 15,000 psi open ■ Reusable - allows easy access to sealed passageways ■ 400°F temperature rating ■ NACE compliant materials ■ Floating seal self aligns -prevents galling ■ O-ring and backup rings included and installed DUAL SEALING A.F.O. PLUG LEE THE LEE COMPANY 2 Pettipaug Road, PO Box 424, Westbrook, Connecticut 06498-0424 Tel: 860-399-6281 • www.theleeco.com

 Open the catalog to page 1
Dual Sealing AFO Plug-2

SEAT COINING Coin the sealing seat using the appropriate tool called out in the table below. The following figures depict a cross section of an installation hole before and after the coining operation. INSTALLATION HOLE BEFORE COINING INSTALLATION HOLE AFTER COINING Coining the seat is accomplished by rotating the coining tool to an appropriate angle. The angle has been calculated to correspond to an even chamfer within the acceptable width. Proper angles of rotation for Lee coining tools are listed in the table to the right. Coining tools are marked with two lines on the top face to aid in the...

 Open the catalog to page 2

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