The Valve,check, cataloged under National Stock Number 4820-00-744-1239, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 30 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4820-00-744-1239 |
| Primary Part Number | 1801576-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | CANCELLED |
| Valve Operation Method | AUTOMATIC |
| Media for Which Designed | AIR FIRST RESPONSE |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Flow Control Device | POPPET |
| Thread Direction | RIGHT-HAND FIRST END |
| Thread Series Designator | NPT FIRST END |
| Nominal Thread Size | 0.125 INCHES FIRST END IN |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Material Document and Classification | QQ-B-626,ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Thread Direction | RIGHT-HAND SECOND END |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 0.125 INCHES SECOND END IN |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SECOND RESPONSE |
| Thread Quantity Per Inch | 27 SECOND END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Material | COPPER ALLOY 360 SEAT |
| Material Document and Classification | FED STD 66,AISI 303/SAE 30303 FED STD 1ST MATERIAL RESPONSE AND FED STD 66,AISI 304/SAE 30304 FED STD 2ND MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Nominal Pipe Size Accommodated | 0.125 INCHES FIRST END IN |
| Nominal Pipe Size Accommodated | 0.125 INCHES SECOND END IN |
| Material | COPPER ALLOY 360 AND STEEL COMP 303 BODY |
| Material Document and Classification | QQ-B-626,ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Thread Series Designator | NPT SECOND END |
| Media for Which Designed | WATER, FRESH THIRD RESPONSE |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING |
| Connection Style | PLAIN (PIPE) SECOND END |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Style Designator | STRAIGHT THRU |
| Disk Loading Method | SPRING |
| Connection Style | PLAIN, OPTIONAL END (PIPE) FIRST END |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 481-1/8B1-2 | Teledyne Industries Inc Teledyne Fluid Systems Republic Business Unit (USA) |
| 1801576 | Northrop Grumman Systems Corporation (USA) |
| 481-1/8B-2 | Teledyne Industries Inc Teledyne Fluid Systems Republic Business Unit (USA) |
| 481-1/8-1 | Republic Mfg Co (USA) |
| 1801576-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
NSN 4820-00-744-1239 is a Valve,check, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4820 (No Item Name Available). Status: cancelled.
NSN 4820-00-744-1239 has 5 cross-referenced part numbers: 481-1/8B1-2 (Teledyne Industries Inc Teledyne Fluid Systems Republic Business Unit), 1801576 (Northrop Grumman Systems Corporation), 481-1/8B-2 (Teledyne Industries Inc Teledyne Fluid Systems Republic Business Unit), 481-1/8-1 (Republic Mfg Co), 1801576-1 (Northrop Grumman Systems Corporation).
There are 3 known substitutes for 4820-00-744-1239: 3040-00-382-5800, 5330-00-929-6538, 5365-01-417-7144. Verify interchangeability with system specifications before substitution.
Key specifications for 1801576-1: Valve Operation Method: AUTOMATIC; Media for Which Designed: AIR FIRST RESPONSE; Maximum Operating Temp: 200.0 FAHRENHEIT SINGLE RESPONSE DEGF; Flow Control Device: POPPET. 30 total characteristics are documented in the Federal Logistics Information System.
NSN 4820-00-744-1239 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.