The Parts Kit,safety Relief Valve, cataloged under National Stock Number 4820-01-536-5554, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-536-5554 |
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Document Type | CATALOG SHEET |
| Component Document Origin | INDUSTRIAL |
| Document Source | 91816 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| K/D559B-4M-D/E | 3/2 Design control — primary reference U.S. Government activity |
| K/D559B-4M-20 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-536-5554 is a Parts Kit,safety Relief Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-576-4775. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-536-5554: Document Type: CATALOG SHEET; Component Document Origin: INDUSTRIAL; Document Source: 91816; Special Features: REPLACEMENT SEAL KIT FOR D559B-4M 0.500 INCH RELIEF VALVES THAT FALL IN THE 14.0 TO 72.9 CRACKING PRESSURE PSIG IN. 3 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.
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.