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Safety Relief Valve

NSN: 4820-00-913-1266 | Model: MS28893-D4-2500

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes valve (1), relief, pressure and temperature.

NSN Properties and Flags
NATO Stock Number
Thread Class
3b all ends
Thread Direction
Right-hand all ends
Flow Control Device
Disk Loading Method
Valve Discharge Flow Rate
2.5 gallons per minute
Maximum Operating Temp
275.0 degrees fahrenheit single response
Connection Style
G4 gasket sea (boss) all ends
Valve Operation Method
Connection Type
Threaded internal boss all ends
Features Provided
Valve stem lock shield and pressure tight outlet side
Maximum Operating Pressure
3850.0 pounds per square inch single response
Thread Size
0.437 inches all ends
Opening Pressure Setting
2500.0 pounds per square inch
Stainless steel body
Media For Which Designed
Fuel/oil, hydrocarbon single response
Style Designator
Thread Series Designator
Unf all ends
Recent Solicitations
Solicitation Return by Date Buyer Code Quantity
SPE7MC18T5568 2018-02-12 PMCMU 31 EA

Inventory Check

The last inventory check on this NSN was done on 10/17/2020. Due to rapid changes in inventory this may not be the current stock qty.

  • New Surplus: 3
  • New: 1

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

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NSN 4820-00-913-1266 Datasheet

Supply Class (FSC):
Nonpowered Valves
Cross Reference:
  • MS28893-D4-2500
Cage Codes:
  • Military Standards (CAGE 96906)
Schedule B & Trade:
  • Schedule B: 8481400000 (NAICS 332911)

    Safety or relief valves

  • SITC: 74740

    Safety or relief valves

  • End Use: 21180

    Industrial machines, other


N - Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.


U - Precious metal content is unknown


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    127220 - Pressure reg/red/relief valves noi

  • WCC:

    594 - Pumps and parts, (machinery and parts),(less than 35 feet)

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater

  • LTL:

    P - 77.5

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability
    Item requires special handling or condemnation procedures for specific reasons, such as precious metal content, high dollar value, critical material, or hazardous materiel. refer to appropriate manuals or directives for specific instructions.

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $1,985.23 to $3,308.72..
Does NSN 4820-00-913-1266 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Army, Department Of The Air Force, Department Of The Navy, Canada, and Germany
What is the NIIN of NSN 4820-00-913-1266?
009131266 or 00-913-1266
Does NSN 4820-00-913-1266 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4820-00-913-1266?
Solicitation SPE7MC18T5568 for qty 31 on 02/02/2018
When was this national stock number assigned to the federal catalog?
Jun 29, 1966