The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-346-1697, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-346-1697 |
| Primary Part Number | 845-6556172-1 MOD |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Second End Relationship with First End | IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| First Connection Face to Centerline Distance | 4.120 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| End Connection Quantity | 2 |
| Second Connection Face to Centerline Distance | 4.500 INCHES NOMINAL IN |
| First End Connection Type | PLAIN FACE FLANGE |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 845-6556172-1 MOD | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 845-6556172 ITEM 1 MODL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 845-6556172 ITEM 1 MOD | 3/1 Design control — primary reference Naval Sea Systems Command |
| 845-6556172-1 MODL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-346-1697 is a Valve,relief,pressure and Temper, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-346-1697 has 1 manufacturer part number on file: 845-6556172-1 MOD (Naval Sea Systems Command).
Key specifications for 845-6556172-1 MOD: Second End Relationship with First End: IDENTICAL; Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS; First Connection Face to Centerline Distance: 4.120 INCHES NOMINAL IN; Criticality Code Justification: ZZZY. 8 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 4820-01-346-1697 has DEMIL Code B. 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.