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Safety Relief Valve

NSN: 4820-00-001-6553 | Model: A51K56028-1

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
4820-00-001-6553
DEMIL
NO
Thread Class
3a 1st end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Disk Loading Method
Spring
Connection Style
External seat for gasket seal (boss) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external boss 1st end
Features Provided
Pressure tight outlet side
Thready Qty Per Inch (tpi)
16 1st end
Thread Size
1.187 inches 1st end
Outside Diameter Tube Accommodated
0.875 inches 1st end
Material
Steel
Style Designator
Straight thru
Thread Series Designator
Unj 1st end

Pricing and Availability

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NSN 4820-00-001-6553 Datasheet

Supply Class (FSC):
Nonpowered Valves
Cross Reference:
  • A51K56028-1
  • A51K56028-1
Cage Codes:
  • Northrop Grumman Systems Corporation (CAGE 61174)
  • Northrop Grumman Systems Corporation (CAGE 26512)
Schedule B & Trade:
  • Schedule B: 8481400000 (NAICS 332911)

    Safety or relief valves

  • SITC: 74740

    Safety or relief valves

  • End Use: 21180

    Industrial machines, other

Identification:
HMIC

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

PMIC

U - Precious metal content is unknown

CRITL

- 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.

  • LTL:

    P - 77.5

  • ACC:

    V - Trailers, vehicles, machinery, shop and warehouse equipment and supplies including special tools and equipment, ground servicing

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
    Sms
  • AAC
    J
  • Quantity per pack
    1
  • Unit of Measure
    Ea
  • Shelf Life
    N/A
  • Classification Control
    U
  • MGMT_CTL
    9b-----
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $5,770.62 to $9,617.69..
Does NSN 4820-00-001-6553 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 Navy
What is the NIIN of NSN 4820-00-001-6553?
000016553 or 00-001-6553
Does NSN 4820-00-001-6553 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4820-00-001-6553?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Sep 29, 1972