NSN 4820-00-568-0156 Repair Services

Safety Relief Valve Overhaul, Repair, and Maintenance

MPN: A50105, 20-91009-5

Pricing and Lead Time Quote

Submit this form and receive an overhaul/repair pricing and lead time quote for NSN 4820-00-568-0156 safety relief valve
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NSN 4820005680156


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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 4820-00-568-0156 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 4820-00-568-0156 can be offered in repaired, serviceable, overhauled, or inspected conditions.
National Stock Number (NSN) 4820-00-568-0156
Categorization Safety or relief valves
Repairability Code

Approximate Weight 0.0lb
Thread Class 3b 1st end
Thread Direction Right-hand 1st end
Flow Control Device Poppet
Disk Loading Method Spring
Valve Discharge Flow Rate 16.0 gallons per minute
Connection Style Gasket sea (boss) 1st end
Connection Type Threaded internal boss 1st end
Features Provided Pressure tight outlet side
Thready Qty Per Inch (tpi) 12 1st end
Maximum Operating Pressure 3000.0 pounds per square inch single response
Thread Size 1.062 inches 1st end
Opening Pressure Setting 1800.0 pounds per square inch
Outside Diameter Tube Accommodated 0.750 inches 1st end
Special Features Free reverse flow
Material Stainless steel seat
Media For Which Designed Hydraulic fluid, phosphate-ester base single response
Style Designator Straight thru
Thread Series Designator Unf 1st end

Part Numbers

Part Number Company RNAAC (Repair Depot)
A50105 HYDRO-AIRE, INC. SB - 645 MSSQ/MSIAPCS
20-91009-5 BOEING COMPANY, THE SB - 645 MSSQ/MSIAPCS