The Valve,safety Relief, cataloged under National Stock Number 4820-00-148-8665, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Lockheed Martin Services, Llc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-148-8665 |
| Primary Part Number | 2820185 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Lockheed Martin Services, Llc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | PLAIN (PIPE) FIRST END |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | HELIUM SECOND RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Material | STEEL OVERALL |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 20.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2820185 | Lockheed Martin Services, Llc (USA) |
| Reference | Meaning |
|---|---|
| 2391244-6-4 | 3/2 Design control — primary reference U.S. Government activity |
| 1944-001 | 5/9 Secondary reference Acc Partners Inc |
| 1944-1-000 | 5/9 Secondary reference Acc Partners Inc |
NSN 4820-00-148-8665 is a Valve,safety Relief, manufactured by Lockheed Martin Services, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-148-8665 has 1 manufacturer part number on file: 2820185 (Lockheed Martin Services, Llc).
1 possible match (shared part number, not a government interchangeability claim): 6710-00-831-7930. Verify interchangeability with system specifications before substitution.
Key specifications for 2820185: Flow Control Device: DISK; Connection Style: PLAIN (PIPE) FIRST END; Minimum Operating Temp: -65.0 FAHRENHEIT DEGF; Style Designator: STRAIGHT THRU. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-00-148-8665 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.