The Valve,safety Relief, cataloged under National Stock Number 4820-01-303-3128, 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 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-303-3128 |
| Primary Part Number | 11-H201B-188 TO 208PSI |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | PLAIN,OPTIONAL END(PIPE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Adjustable Pressure Range | +188.0 TO 208.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.250 INCHES SECOND END IN |
| Nominal Thread Size | 1.000 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | BRONZE BODY |
| Thread Series Designator | NPTF SECOND END |
| Thread Series Designator | NPT FIRST END |
| 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 |
|---|---|
| FBFFE 1X1.25IN | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 11-H201B-188 TO 208PSI PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| Reference | Meaning |
|---|---|
| 11-H-201B | C/1 Advisory reference — outside the item-of-supply concept Kunkle Industries Inc Lonergan Valve Div |
| 11-H201B-188 TO 208PSI | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| FBFFE 1X1.25IN | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
NSN 4820-01-303-3128 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-303-3128 has 2 manufacturer part numbers on file: FBFFE 1X1.25IN (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 11-H201B-188 TO 208PSI (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for 11-H201B-188 TO 208PSI: Flow Control Device: DISK; Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED INTERNAL PIPE SECOND END. 16 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.