The Valve,safety Relief, cataloged under National Stock Number 4820-00-078-3299, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-078-3299 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Renewable Seat Ring Type | PRESSED-IN |
| Connection Style | GASKET SEAL(BOSS) ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +140.0 TO 150.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | BONNET PACKING |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.500 INCHES ALL ENDS IN |
| Maximum Operating Temp | 275.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Surface Treatment | ENAMEL LOCATION NOT OTHERWISE SPECIFIED |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | HYDRAULIC FLUID, PETROLEUM BASE SINGLE RESPONSE |
| Thread Class | 3B ALL ENDS |
| Test Data Document | 80378-205-15-2070 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING) |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Material | ALUMINUM ALLOY BODY |
| Thread Series Designator | UN ALL ENDS |
| Valve Discharge Flow Rate | 25.0 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 |
| Reference | Meaning |
|---|---|
| A63256-3 | 3/2 Design control — primary reference U.S. Government activity |
| 215-32359-3 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 4820-00-078-3299 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-078-3299: Flow Control Device: PISTON; Renewable Seat Ring Type: PRESSED-IN; Connection Style: GASKET SEAL(BOSS) ALL ENDS; Style Designator: STRAIGHT THRU. 24 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.