The Valve,safety Relief, cataloged under National Stock Number 4820-00-155-5671, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Pneudraulics, Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-155-5671 |
| Primary Part Number | 1694-3 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Pneudraulics, Inc. |
| Status | ACTIVE |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Operating Pressure | 3500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Media for Which Designed | HYDRAULIC FLUID, PETROLEUM BASE SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Thread Quantity Per Inch | 16 FIRST END |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Opening Pressure Setting | 2000.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 2.0 GALLONS PER MINUTE |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1694-3 PRIMARY | Pneudraulics, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2-43922-3 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 2-43922-3 | 7/9 Vendor item drawing reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 4820-00-155-5671 is a Valve,safety Relief, manufactured by Pneudraulics, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-155-5671 has 1 manufacturer part number on file: 1694-3 (Pneudraulics, Inc.).
4 possible matches (shared part number, not a government interchangeability claim): 5220-00-566-4047, 1680-00-630-2543, 2530-01-466-1609. Verify interchangeability with system specifications before substitution.
Key specifications for 1694-3: Connection Type: THREADED EXTERNAL TUBE FIRST END; Operating Pressure: 3500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Features Provided: PRESSURE TIGHT OUTLET SIDE; Thread Direction: RIGHT-HAND FIRST END. 13 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.