The Valve,safety Relief, cataloged under National Stock Number 4820-01-102-8512, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 23 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-102-8512 |
| Primary Part Number | 81S68-8 2750PSIG |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Style Designator | ANGLE |
| Material Document and Classification | AISI 316 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM A351,GRADE CF8M ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 10000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 1.000 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Maximum Operating Temp | 450.0 CELSIUS SINGLE RESPONSE DEGC |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | INTEGRAL |
| Material | STEEL BODY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Material | STEEL COMP 316 FLOW CONTROL DEVICE |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 2750.0 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 |
| Part Number | Manufacturer |
|---|---|
| 81S68-8 2750PSIG PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
NSN 4820-01-102-8512 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-102-8512 has 1 manufacturer part number on file: 81S68-8 2750PSIG (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for 81S68-8 2750PSIG: Flow Control Device: POPPET; Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND END; Connection Type: THREADED INTERNAL PIPE FIRST END; Connection Type: THREADED INTERNAL PIPE SECOND END. 23 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.