Restrictor Check Valve
749943-105
(NSN) National Stock Number
4820-00-281-4701
Federal Supply Classification
4820 Nonpowered Valves
Item Name Code
20520
Schedule B Code
8481302090
Summary
3a all ends thread class, right-hand all ends thread direction, poppet flow control device, spring disk loading method, 275.0 deg fahrenheit 2nd response maximum operating temp, -65.0 deg fahrenheit 1st response maximum operating temp
| DAC | HCC | DMIL | RNCC |
|---|---|---|---|
| 1 | - | - | 5 |
| RNVC | SADC | MSDS | RNAAC |
|---|---|---|---|
| 9 | - | - | ZZ |
Identification
A valve having an orifice in the poppet, disk, or the like, to permit restricted fluid flow when the valve is seated. It does not have a stem or provisions for pressure adjustments, and is similar to a valve, check with the exception of the orifice which permits fluid flow in more than one direction.
| INC | FIIG | Concept | Condition |
|---|---|---|---|
| 20520 | A530B0 | 1 | 1 |
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.Disk Loading Method
spring
Details
The means of closing the item when inlet pressure decreases.Maximum Operating Temp
275.0 deg fahrenheit 2nd response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Maximum Operating Temp
-65.0 deg fahrenheit 1st response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Connection Style
flareless 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/.Mounting Position
horizontal or vertical
Details
The installed position for which the item is designed.Maximum Operating Pressure
3000.0 pounds per square inch single response
Details
The maximum pressure at which the item is rated for operation.Nominal Thread Size
0.562 inches 2nd end
Details
A designation that is used for the purpose of general identification of the thread.Nominal Thread Size
0.750 inches 1st end
Details
A designation that is used for the purpose of general identification of the thread.Seat Angle
12.0 degrees all ends
Details
The angle of the end surface upon which the mated surface seats.Material
steel corrosion resisting body
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
steel corrosion resisting flow control device
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Media For Which Designed
hydraulic fluid, phosphate-ester base single response
Details
The type of media for which the item is designed.Style Designator
straight thru
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.Thread Series Designator
unjf 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.Master-Cross Reference List
| Part | CAGE | DAC | HCC | RNCC | RNVC | MSDS | RNAAC |
|---|---|---|---|---|---|---|---|
| 6F2964-105 | 99240 | 5 | - | C | 1 | - | ZZ |
| 6R110-105 | 82829 | 5 | - | 3 | 2 | - | KE |
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
| HMIC | PMIC | ESD/EMI | Criticality |
|---|---|---|---|
| N | U | - | - |
Freight
Universal / National Freight and Handling Information
| UFC | HMC | LTL | LCL |
|---|---|---|---|
| 29300 | - | W | - |
| RVC | WCC | TCC | SHC |
|---|---|---|---|
| - | 594 | Z | 9 |
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Manufacturer
LOCKHEED MARTIN CORP DIV LOCKHEED MARTIN AERONAUTICS COMPANY
CAGE: 98897
MARIETTA
, GA
, 30063-0001
UNITED STATES
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FAQs
Frequently asked questions for NSN 4820-00-281-4701
What is the NIIN of the NSN 4820-00-281-4701?
The National Item Identification Number (NIIN) of the NSN 4820-00-281-4701 is 00-281-4701
When the NSN 4820-00-281-4701 was assigned to the Federal Catalog?
It was assigned 51 years ago, on Sun, Aug 26, 1973
Does the NSN 4820-00-281-4701 contain any precious metals?
Type/content is unknown
Does the NSN 4820-00-281-4701 contain any hazardous material?
No data in HMIRS
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