The Valve,safety Relief, cataloged under National Stock Number 4820-00-342-4799, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Howden Fluid Systems. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-342-4799 |
| Primary Part Number | 16649-18 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Howden Fluid Systems |
| Status | ACTIVE |
| Material | ALUMINUM ALLOY 2024 SEAT |
| Style Designator | STRAIGHT THRU |
| Maximum Operating Temp | -70.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 450.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Connection Style | PLAIN (PIPE) FIRST END |
| Media for Which Designed | OXYGEN, GASEOUS SECOND RESPONSE |
| Nominal Thread Size | 0.125 INCHES FIRST END IN |
| Material | ALUMINUM ALLOY 2024 BODY |
| Thread Series Designator | NPT FIRST END |
| Operating Pressure | 30.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Disk Loading Method | SPRING |
| Media for Which Designed | AIR FIRST RESPONSE |
| Valve Discharge Flow Rate | 0.9 CUBIC FEET PER MINUTE |
| Media for Which Designed | OIL, CHLORINATED TRANSFORMER THIRD RESPONSE |
| Opening Pressure Setting | 26.0 POUNDS PER SQUARE INCH LBS |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Material | STEEL CORROSION RESISTING AND SILICON FLOW CONTROL DEVICE |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Valve Operation Method | AUTOMATIC |
| Flow Control Device | DISK |
| Material | ALUMINUM ALLOY 2024 STEM |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 16649-18 | Howden Fluid Systems (USA) |
| 14023 | Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc. (USA) |
| 16649 | Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc. (USA) |
| 16649 | Howden Fluid Systems (USA) |
| 16649-18 | Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc. (USA) |
| 14023 | Howden Fluid Systems (USA) |
| 7620119 | Us Army Aviation and Missile Command (USA) |
NSN 4820-00-342-4799 is a Valve,safety Relief, manufactured by Howden Fluid Systems, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-342-4799 has 7 cross-referenced part numbers: 16649-18 (Howden Fluid Systems), 14023 (Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc.), 16649 (Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc.), 16649 (Howden Fluid Systems), 16649-18 (Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc.) and 2 more.
There are 12 known substitutes for 4820-00-342-4799: 2910-00-030-3580, 4730-00-050-4203, 5310-00-139-6551 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 16649-18: Material: ALUMINUM ALLOY 2024 SEAT; Style Designator: STRAIGHT THRU; Maximum Operating Temp: -70.0 FAHRENHEIT FIRST RESPONSE DEGF; Maximum Operating Temp: 450.0 FAHRENHEIT SECOND RESPONSE DEGF. 22 total characteristics are documented in the Federal Logistics Information System.