The Valve,safety Relief, cataloged under National Stock Number 4820-01-189-7830, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-189-7830 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Shape | ROUND ALL ENDS |
| Renewable Seat Ring Type | PRESSED-INPRESSED-IN |
| Flange Face Design | PLAIN ALL ENDS |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS. |
| Disk Loading Method | SPRINGSPRING |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Valve Operation Method | AUTOMATICAUTOMATIC |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY SOURCE CONTROL DRAWING |
| 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 |
| Reference | Meaning |
|---|---|
| 195-180 | 5/9 Secondary reference U.S. Government activity |
| 195-180-1 | 3/3 Design control — primary reference U.S. Government activity |
| 4G94000-137B | 1/3 Source control — Government-approved source U.S. Government activity |
| 4G94000-137A | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-189-7830 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6130-01-277-5792. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-189-7830: Flange Shape: ROUND ALL ENDS; Renewable Seat Ring Type: PRESSED-INPRESSED-IN; Flange Face Design: PLAIN ALL ENDS; Connection Type: FLANGE ALL ENDS. 9 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 4820-01-189-7830 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.