The Valve,safety Relief, cataloged under National Stock Number 4820-00-287-4063, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 26 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-287-4063 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | FLARED (TUBE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Minimum Operating Temp | -40.0 FAHRENHEIT DEGF |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES ALL ENDS IN |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | VALVE STEM LOCK SHIELD AND PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SCREW |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.375 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES SECOND END |
| Maximum Operating Temp | 225.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | INTEGRAL |
| Media for Which Designed | REFRIGERANT 22 SECOND RESPONSE |
| Media for Which Designed | REFRIGERANT 12 FIRST RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY STEM |
| Material | RUBBER CHLOROPRENE CLASS CR FLOW CONTROL DEVICE |
| Material | COPPER ALLOY SEAT |
| Thread Series Designator | NPTF FIRST END |
| Opening Pressure Setting | 200.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 526E-200 | 3/9 Design control — primary reference Henry Technologies, Inc. |
| B502A | 5/9 Secondary reference Henry Technologies, Inc. |
NSN 4820-00-287-4063 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5306-00-576-2513. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-287-4063: Flow Control Device: DISK; Connection Style: FLARED (TUBE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Minimum Operating Temp: -40.0 FAHRENHEIT DEGF. 26 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.