Safety Relief Valve
21C2222-261
(NSN) National Stock Number
4820-00-010-1680
Federal Supply Classification
4820 Nonpowered Valves
Item Name Code
05488
Schedule B Code
8481400000
Summary
3a all ends thread class, right-hand all ends thread direction, poppet flow control device, inside spring bonnet type, integral bonnet attachment method, spring disk loading method
| DAC | HCC | DMIL | RNCC |
|---|---|---|---|
| X | - | - | 5 |
| RNVC | SADC | MSDS | RNAAC |
|---|---|---|---|
| 2 | - | - | XX |
Identification
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.
| INC | FIIG | Concept | Condition |
|---|---|---|---|
| 05488 | A046B0 | 1 | 2 |
Specifications
Thread Class
3a all ends
Details
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.Thread Direction
right-hand all ends
Details
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.Flow Control Device
poppet
Details
The part that controls the flow through the item.Bonnet Type
inside spring
Details
Indicates the type of housing on the item that accommodates the stem packing or spring.Bonnet Attachment Method
integral
Details
The means by which the bonnet is attached to the item.Disk Loading Method
spring
Details
The means of closing the item when inlet pressure decreases.Maximum Operating Temp
225.0 deg fahrenheit single response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Connection Style
flared (tube) all ends
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.Valve Operation Method
automatic
Details
The means used to control the operation of the valve.Connection Type
threaded external tube all ends
Details
Indicates the type of connection/s/.Features Provided
bonnet packing and pressure tight outlet side
Details
Those features,not otherwise specified,which may be required for proper functioning of the item.Thread Quantity Per Inch
16 all ends
Details
The number of threads on the item per linear inch measured on a line parallel to the thread axis.Adjustable Pressure Range
+10.0 to 50.0 pounds per square inch
Details
The minimum to maximum pressures at which the item may be set to open.Maximum Operating Pressure
50.0 pounds per square inch single response
Details
The maximum pressure at which the item is rated for operation.Nominal Thread Size
0.750 inches all ends
Details
A designation that is used for the purpose of general identification of the thread.Seat Angle
37.0 degrees all ends
Details
The angle of the end surface upon which the mated surface seats.Opening Pressure Setting
35.0 pounds per square inch
Details
The predetermined pressure at which the item is calibrated to open.Nominal Outside Diameter Tube Accommodated
0.500 inches all ends
Details
The nominal length of a straight line which passes through the center of the accommodated tube,and terminates at the outside circumference.Material
steel comp 303 body
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
steel comp 303 seat
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
steel comp 416 flow control device
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material Document And Classification
fedstd66,aisi303/sae30303 fed std single material response body
Details
The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.Material Document And Classification
fedstd66,aisi303/sae30303 fed std single material response seat
Details
The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.Material Document And Classification
fedstd66,aisi416/sae51416 fed std single material response flow control device
Details
The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.Media For Which Designed
water-oil-gas single response
Details
The type of media for which the item is designed.Surface Treatment
passivate
Details
The metallic,nonmetallic,and/or chemical properties with which the item is plated,dipped,and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.Style Designator
angle
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.Thread Series Designator
unf all ends
Details
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.Furnished Items And Quantity
2 ferrule
Details
The name and number of those parts furnished with the item of supply that have not been specified elsewhere.Master-Cross Reference List
| Part | CAGE | DAC | HCC | RNCC | RNVC | MSDS | RNAAC |
|---|---|---|---|---|---|---|---|
| 21C2222-261 | 31682 | 1 | - | 5 | 2 | - | KE |
| 21C2222-261 | 07482 | 5 | - | 5 | 9 | - | XX |
| A644XB-2-8-2 | 09990 | 5 | - | 3 | 2 | - | ZZ |
| A644X2-8 | 86768 | X | - | 5 | 9 | - | XX |
| A644XB2-8-2 | 86768 | X | - | 5 | 9 | - | XX |
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
| HMIC | PMIC | ESD/EMI | Criticality |
|---|---|---|---|
| N | A | - | - |
Freight
Universal / National Freight and Handling Information
| UFC | HMC | LTL | LCL |
|---|---|---|---|
| 64490 | - | P | - |
| RVC | WCC | TCC | SHC |
|---|---|---|---|
| - | 576 | Z | 9 |
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FAQs
Frequently asked questions for NSN 4820-00-010-1680
What is the NIIN of the NSN 4820-00-010-1680?
The National Item Identification Number (NIIN) of the NSN 4820-00-010-1680 is 00-010-1680
When the NSN 4820-00-010-1680 was assigned to the Federal Catalog?
It was assigned 61 years ago, on Tue, Jan 1, 1963
Does the NSN 4820-00-010-1680 contain any precious metals?
Does not contain precious metal
Does the NSN 4820-00-010-1680 contain any hazardous material?
No data in HMIRS
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