The Valve,safety Relief, cataloged under National Stock Number 4820-00-176-4621, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Tactair Fluid Controls Inc. Government technical data includes 26 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-176-4621 |
| Primary Part Number | 2683 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SECOND RESPONSE |
| Material | ALUMINUM BODY |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Thread Class | 3A ALL ENDS A |
| Adjustable Pressure Range | +3.0 TO 7.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Flow Control Device | POPPET |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Thread Series Designator | UNF ALL ENDS |
| Operating Pressure | 30.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Material | ALUMINUM BODY |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SECOND RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Operating Pressure | 30.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Disk Loading Method | SPRING |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Thread Series Designator | UNF ALL ENDS |
| Adjustable Pressure Range | +3.0 TO 7.0 POUNDS PER SQUARE INCH LBS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES FIRST END IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 2683 | Kaiser Fluid Technologies Inc. (USA) |
| 2683 | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| 205-062-668-1 | Bell Textron Inc (USA) |
| 4P145 | Allen Aircraft Products Inc (USA) |
| 2683 PRIMARY | Tactair Fluid Controls Inc (USA) |
| 205-062-668-001 | Bell Textron Inc (USA) |
NSN 4820-00-176-4621 is a Valve,safety Relief, manufactured by Tactair Fluid Controls Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-176-4621 has 6 cross-referenced part numbers: 2683 (Kaiser Fluid Technologies Inc.), 2683 (Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair), 205-062-668-1 (Bell Textron Inc), 4P145 (Allen Aircraft Products Inc), 2683 (Tactair Fluid Controls Inc) and 1 more.
There are 10 known substitutes for 4820-00-176-4621: 3020-00-214-3186, 5305-00-486-1633, 5310-00-550-1364 and 7 more. Verify interchangeability with system specifications before substitution.
Key specifications for 2683: Seat Angle: 37.0 DEGREES ALL ENDS; Media for Which Designed: FUEL/OIL, HYDROCARBON SECOND RESPONSE; Material: ALUMINUM BODY; Connection Style: FLARED (TUBE) ALL ENDS. 26 total characteristics are documented in the Federal Logistics Information System.