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Pressure And Temperature Relief Valve

NSN: 4820-00-207-8821 | Model: 540 1-2

A valve designed to release under excessive pressure and/or excessive temperature by opening at a predetermined pressure and/or temperature. Thermostatically operated valves close when the pressure is relieved or the temperature is reduced. Fusible plug valves require replacement of the plug. See also valve, safety relief and valve, regulating. Temperature.

NSN Properties and Flags
NATO Stock Number
4820-00-207-8821
DEMIL
NO
Body Material
Brass
Body Style
Angle give "adqm" and "adqn" only if flanged one or two ends
Tempurature Rating
210.0 degrees fahrenheit
Media For Which Designed
Water, fresh
First End Connection Type
Threaded internal pipe
First End Style Designator
Optional end
First End Pipe Size Accommodated
0.500 inches
First End Thread Direction
Right-hand
Second End Relationship With First End
Not identical
Second End Connection Type
Threaded external pipe
Second End Style Designator
Plain
Second End Pipe Size Accommodated
0.500 inches
Second End Thread Direction
Right-hand
Seat Material
Brass
Flow Control Device
Disk, lift
Flow Control Device Material
Steel, corrosion resisting
End Connection Quantity
2
Opening Pressure Setting
175.0 pounds per square inch
Adjustable Pressure Range
+75.0/+175.0 pounds per square inch
Bulb Length
4.000 inches
Bulb Diameter
0.812 inches
Tempurature Adjustability
Not adjustable
Tempurature Control Device Type
Fusible
Special Features
Temperature water rating at 50000-btu/hr

Pricing and Availability

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NSN 4820-00-207-8821 Datasheet

Supply Class (FSC):
Nonpowered Valves
Cross Reference:
  • 540 1-2
Cage Codes:
  • Watts Regulator Co (CAGE 79227)
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.

Questions & Answers:

What are the historical prices recorded for this stock number?
No pre-dated pricing for this NSN could be found.
Does NSN 4820-00-207-8821 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Tennessee Valley Authority
What is the NIIN of NSN 4820-00-207-8821?
002078821 or 00-207-8821
Does NSN 4820-00-207-8821 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4820-00-207-8821?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Apr 13, 1973