Custom Stainless Steel Fuel Nozzle Seal for Pratt & Whitney Jet Engine

Steel Fuel Nozzle Seal

Steel Fuel Nozzle Seal

Steel Fuel Nozzle Seal Half Section

Steel Fuel Nozzle Seal Half Section


This featured fuel nozzle seal is used on a Pratt & Whitney JT8D jet engine – the power plant for thousands of MD-80 and DC-9 commercial aircraft in the sky today. Our engineering staff worked with Pratt & Whitney engineers to design the critical features of this part. To manufacture the seal, a variety of CNC machining processes were applied with custom made tooling. Using a twin spindle Traub lathe with live tooling, we turned each side, with both sides requiring a dual spring diaphragm, with a .0002″ to .0005″ knife edge radius on both the I.D. and O.D periphery. The knife edges were selectively nitride coated for hardness. Four slots at 90 degrees were CNC machined into the sealer support area below the knife edges. Twelve equally spaced .123″ to .127″ holes were drilled into the face. Throughout the machining process we maintained tight tolerances of +.0002″/-004″, and a concentricity tolerance of .0005″. To conduct inspection we relied on an OGP touch probe and a vision system CMM, as well as micrometers, pin gages, a custom thread gage, a drop gage, and an optical comparator. Each seal is 100% inspected under a 20X power microscope for any visual imperfections and 100% vacuum tested for sealing.

Each part has complete identification and traceability, and was individually packed between foam in a plastic container and put into an intermediate container. We labeled each intermediate container with part and lot numbers, as well as the quantity. Included in each order was a raw material certification, complete with chemical and mechanical properties, and quality control verification. The project took 4 to 6 weeks to complete, and was then shipped to our client for use in the aerospace industry.

Specifications for Stainless Steel Fuel Nozzle Seal

Capabilities Applied/Processes CNC Machining
Inspection
Equipment Used to Manufacture Part 5-Axis Traub Lathe w/ Live tooling
OGP Touch Probe and Vision System CMM
Overall Part Dimensions 1.250″ Round Bar Stock
O.D. 1.230″
I.D .417″
Tightest Tolerances +0002″/-.004″
Concentricity of .0005″
±1°
Material Used 17-4 Stainless Steel per AMS5643
Max Material Finish 8 RMS
Typical Machining Operations CNC Machining:
Set up On Lathe
Turn:
Proprietary machiningInspection:
Inspected using:
CMM
Micrometers
Pin Gages
Custom Thread Gage
Drop Gage
Optical ComparatorPackaging:
Packaged to GMMCO StandardsPaperwork Includes:
Raw Material Certification w/ Chemical & Mechanical Properties
All paper work is Stamped with Pratt & Whitney Acceptance stamps
Packaging Slip
Estimated Part Weight ½ pound
Industry for Use Aerospace
Delivery Time 4-6 Weeks
Standards Met Customer supplied print
Product Name Fuel Nozzle Seal
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