The Valve,safety Relief, cataloged under National Stock Number 4820-01-633-4764, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-633-4764 |
| Primary Part Number | 11-NS-0728D0 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Style Designator | ANGLE |
| Bonnet Type | INSIDE SPRING |
| Bonnet Attachment Method | BOLTED |
| Material | STEEL COMP 303 STEM |
| Material | STEEL COMP 303 SEAT |
| Material | STEEL UNS J92600 BODY |
| Material | STEEL COMP 303 DISK |
| Valve Operation Method | AUTOMATIC |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 11-NS-0728D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7233858-A341D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 20307BS51SSD0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7550478-A18D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 17205D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| H547-0001-A341D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 11-GN-0728D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| G547-0002-A18D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| 20307 SERVICE P/N 20307NS51SSD0 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 20307BS51SS | 5/9 Secondary reference Anderson Greenwood and Co |
| 20307 SERVICE P/N 20307NS51SS | 5/1 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| H547-0001-A341 | 5/1 Secondary reference U.S. Government activity |
| 17205 | 3/1 Design control — primary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| 7550478-A18 | 5/1 Secondary reference Naval Sea Systems Command |
| 20307BS51SS | 5/1 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| 11-NS-0728 | 5/1 Secondary reference U.S. Government activity |
| 7383858-A341 | 5/1 Secondary reference Naval Sea Systems Command |
| 11-GN-0728 | 5/1 Secondary reference U.S. Government activity |
| G547-0002-A18 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-633-4764 is a Valve,safety Relief, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-633-4764 has 9 manufacturer part numbers on file: 11-NS-0728D0 (Naval Inventory Control Point Mechanicsburg), 7233858-A341D0 (Naval Inventory Control Point Mechanicsburg), 20307BS51SSD0 (Naval Inventory Control Point Mechanicsburg), 7550478-A18D0 (Naval Inventory Control Point Mechanicsburg), 17205D0 (Naval Inventory Control Point Mechanicsburg) and 4 more.
Key specifications for 11-NS-0728D0: Criticality Code Justification: ZZZY; Style Designator: ANGLE; Bonnet Type: INSIDE SPRING; Bonnet Attachment Method: BOLTED. 10 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.