NSN 4820-00-559-4399 Repair Services

Safety Relief Valve Overhaul, Repair, and Maintenance

MPN: 516262-1, 640B-1-1/8-2, 640B-1-4-2, 640B-11-8-2

Pricing and Lead Time Quote

Submit this form and receive an overhaul/repair pricing and lead time quote for NSN 4820-00-559-4399 safety relief valve
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NSN 4820005594399


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AS9120B:2015 ISO 9001 Audited and Certified

FAA and EASA Part 145 Certified Repair Stations Ensuring the highest standards of quality and compliance for our clients' needs.

We specialize in the repair and refurbishment of nsn components. From mechanical assemblies to rotor blades, our comprehensive capabilities cover a wide range of NSN parts, providing cost effective solutions to extend the operational life of vital equipment.

NSN 4820-00-559-4399 has been designated as a repairable item and has been included in our capabilities catalog. If you require overhaul or repair services use the form on this page to send us your information. We will provide you with a lead time and price quote.

Repairability and Datasheet

NSN 4820-00-559-4399 can be offered in repaired, serviceable, overhauled, or inspected conditions.
National Stock Number (NSN) 4820-00-559-4399
Categorization Safety or relief valves
Repairability Code

Approximate Weight 0.8lb
Thread Class 3b all ends
Thread Direction Right-hand all ends
Flow Control Device Poppet
Disk Loading Method Spring
Maximum Operating Temp 225.0 degrees fahrenheit single response
Connection Style Gasket sea (boss) all ends
Valve Operation Method Automatic
Connection Type Threaded internal boss all ends
Adjustable Pressure Range +1500.0/+2750.0 pounds per square inch
Maximum Operating Pressure 3600.0 pounds per square inch single response
Thread Size 0.750 inches all ends
Material Steel comp 416 flow control device
Media For Which Designed Hydraulic fluid, petroleum base single response
Surface Treatment Passivate
Style Designator Angle
Thread Series Designator Unf all ends

Part Numbers

Part Number Company RNAAC (Repair Depot)
516262-1 NAVAL AIR WARFARE CENTER AIRCRAFT AX - DLA LAND AND MARITIME
640B-1-1/8-2 TELEDYNE INDUSTRIES INC AX - DLA LAND AND MARITIME
640B-1-4-2 TELEDYNE INDUSTRIES INC AX - DLA LAND AND MARITIME
640B-11-8-2 TELEDYNE INDUSTRIES INC AX - DLA LAND AND MARITIME
640B-11-8-2 PARKER-HANNIFIN CORPORATION ZZ - USA