The Retainer,seat,valve, cataloged under National Stock Number 4820-01-659-0434, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-659-0434 |
| Item Name | Retainer,seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P9290 SYSTEM CERTIFICATION PROCEDURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS AND REQUIRES CLEANING, PACKING, AND MARKING IAW MIL-STD-1622 OR MIL-STD-1330 AS DEEMED APPLICABLE; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICALS AS DIFFERENTIATED BY SPECIAL TEST FEATURES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 2641-405-11 ITEM 30 | 5/2 Secondary reference U.S. Government activity |
| H547-0001-264140511-30D8 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 2641-809-40 ITEM 53 | 5/2 Secondary reference U.S. Government activity |
| 2641-405-11 ITEM 30D8 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 7383858-264140511-30 | 3/1 Design control — primary reference Naval Sea Systems Command |
| H547-0001-264140511-30 | 5/2 Secondary reference U.S. Government activity |
| 7383858-264140511-30D8 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 2641-809-40 ITEM 53D8 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-659-0434 is a Retainer,seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-659-0434: Criticality Code Justification: ZZZY; Part Name Assigned by Controlling Agency: RING,SEAT RETAINER; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P9290 SYSTEM CERTIFICATION PROCEDURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS AND REQUIRES CLEANING, PACKING, AND MARKING IAW MIL-STD-1622 OR MIL-STD-1330 AS DEEMED APPLICABLE; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICALS AS DIFFERENTIATED BY SPECIAL TEST FEATURES. 2 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.