NSN 4820-01-449-8123 644XB4122, 644XB-4-12-2, 01-449-8123
Product Details | SAFETY RELIEF VALVE
4820-01-449-8123 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.
Part Alternates: 644XB4122, 644XB-4-12-2, 4820-01-449-8123, 01-449-8123, 4820014498123, 014498123
| Supply Group (FSG) | NSN Assign. | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 48 | 16 OCT 1997 | 01-449-8123 | 05488 ( VALVE, SAFETY RELIEF ) |
Drawings & Photos | NSN 4820-01-449-8123
Demand History | NSN 4820-01-449-8123
| Part Number | Request Date | QTY | Origin |
|---|---|---|---|
| 644XB-4-12-2 | 2025-10-282 | 7 | DIBBS |
| 644XB-4-12-2 | 2022-08-216 | 3 | DIBBS |
| 644XB-4-12-2 | 2022-07-205 | 3 | DIBBS |
| 644XB-4-12-2 | 2022-03-79 | 2 | DIBBS |
| 644XB-4-12-2 | 2021-10-304 | 1 | DIBBS |
| 644XB-4-12-2 | 2021-08-237 | 1 | DIBBS |
Cross Reference | NSN 4820-01-449-8123
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 644XB-4-12-2 | 09990 | PARKER-HANNIFIN CORPORATION DBA HYDRAULIC VALVE DIV |
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Technical Data | NSN 4820-01-449-8123
| Characteristic | Specifications |
|---|---|
| MATERIAL | STEEL COMP 303 BODY STEEL CORROSION RESISTING FLOW CONTROL DEVICE RUBBER SYNTHETIC PACKING |
| STYLE DESIGNATOR | C1 ANGLE |
| FLOW CONTROL DEVICE | DISK |
| MEDIA FOR WHICH DESIGNED | WATER-OIL-GAS SINGLE RESPONSE |
| MAXIMUM OPERATING PRESSURE | 3600.0 POUNDS PER SQUARE INCH SINGLE RESPONSE |
| MAXIMUM OPERATING TEMP | 250.0 DEG FAHRENHEIT SINGLE RESPONSE |
| VALVE OPERATION METHOD | AUTOMATIC |
| CONNECTION TYPE | THREADED EXTERNAL BOSS ALL ENDS |
| CONNECTION STYLE | G43 EXTERNAL SEAT FOR GASKET SEAL ALL ENDS |
| SEAT ANGLE | 37.0 DEGREES ALL ENDS |
| THREAD SERIES DESIGNATOR | UN ALL ENDS |
| NOMINAL THREAD SIZE | 1.062 INCHES ALL ENDS |
| THREAD QUANTITY PER INCH | 12 ALL ENDS |
| THREAD CLASS | 3A ALL ENDS |
| THREAD DIRECTION | RIGHT-HAND ALL ENDS |
| BONNET TYPE | INSIDE SPRING |
| BONNET ATTACHMENT METHOD | INTEGRAL |
| DISK LOADING METHOD | SPRING |
| ADJUSTABLE PRESSURE RANGE | 115.0 TO 250.0 POUNDS PER SQUARE INCH |
| III END ITEM IDENTIFICATION | AIRCRAFT, AWACS, E-3A |
Restrictions/Controls & Freight Information | NSN 4820-01-449-8123
| Category | Code | Description |
|---|---|---|
| Shelf-Life Code: | 0 | Nondeteriorative |
| Hazardous Material Indicator Code | N | There is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials |
| Demilitarization Code: | Q | Strategic List Item (SLI). Demilitarization not required. SLI are non-MLI(Munitions List Items) controlled by the U.S. Dept. of Commerce through the Export Administration Regulations (EAR) and indicated on the Commerce Control List (CCL). Each CCL entry is preceded by a four-digit Export Control Commerce Control List Item (CCLI) – MUT to the point of scrap required outside the United States. Inside the United States, MUT is required when the DEMIL integrity code (IC) is “3” and MUT is not required when the DEMIL IC is “6.” |
| Controlled Inventory Item Code: | U | UNCLASSIFIED |
| Precious Metals Indicator Code: | A | Item does not contain precious metal |
| Criticality Code: | X | The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. |
| Category | Code | Description |
|---|---|---|
| NMF Description | 127220 | PRESSURE REG/RED/RELIEF VALVES NOI |
| Less than car load rating | ||
| Less than truck load rating | P | 77.5 |
| Water commodity Code | 594 | unknown |
| Originating Activity Code | AH | Defense Supply Center Columbus Columbus, OH 43215 |
| Air Dimension Code | A | Shipment is not a consolidation and does not exceed 72 inches in any dimension. |
| Air Commodity | V | Vehicles, machinery, shop and warehouse equipment and supplies, including special tools and equipment, ground servicing and special purpose vehicles, marine equipment and supplies, repair and maintenance parts for the above. |
| Air Special Handling | Z | No special handling required. |
| Special Handling Code | 9 | unknonwn |
| HAZMAT | ||
| Type of Cargo | Z | No special type of cargo code applicable |