The Valve,safety Relief, cataloged under National Stock Number 4820-00-287-2996, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-00-287-2996 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Renewable Seat Ring Type | THREADED |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Adjustable Pressure Range | +136.0 TO 169.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | EXPOSED SPRING |
| Maximum Operating Temp | 425.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 150.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Nondefinitive Spec/std Data | 1 TYPE AND C CLASS |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | UNION |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY STEM |
| Material | COPPER ALLOY SEAT |
| 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 |
|---|---|
| MILV20065 | 4/1 Identification reference U.S. Government activity |
| TYA1CLC3-8 400-136T0169SBU | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-00-287-2996 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-287-2996: Flow Control Device: DISK; Renewable Seat Ring Type: THREADED; Connection Type: UNTHREADED INTERNAL PIPE FIRST END; Style Designator: ANGLE. 19 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.