NSN 4820-00-057-7231 Repair Services

Safety Relief Valve Overhaul, Repair, and Maintenance

MPN: 174A, 174A-1IN-75PSI

Pricing and Lead Time Quote

Submit this form and receive an overhaul/repair pricing and lead time quote for NSN 4820-00-057-7231 safety relief valve
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NSN 4820000577231


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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 4820-00-057-7231 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 4820-00-057-7231 can be offered in repaired, serviceable, overhauled, or inspected conditions.
National Stock Number (NSN) 4820-00-057-7231
Categorization Safety or relief valves
Repairability Code

Approximate Weight 2.1lb
Pipe Size Accommodated 1.000 inches all ends
Thread Direction Right-hand all ends
Flow Control Device Disk
Bonnet Type Inside screw
Bonnet Attachment Method Threaded
Disk Loading Method Spring
Connection Style Plain, optional en (pipe) all ends
Valve Operation Method Manual
Connection Type Threaded internal pipe all ends
Features Provided Valve stem lock shield
Thread Size 1.000 inches all ends
Opening Pressure Setting 75.0 pounds per square inch
Material Copper alloy
Style Designator Angle
Thread Series Designator Npt 1st end
Reference Number Differentiating Characteristics As differentiated by pressure setting and size

Part Numbers

Part Number Company RNAAC (Repair Depot)
174A WATTS REGULATOR CO AX - DLA LAND AND MARITIME
174A-1IN-75PSI WATTS REGULATOR CO AX - DLA LAND AND MARITIME