The Valve,safety Relief, cataloged under National Stock Number 4820-01-294-8124, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Cross Mfg Co Inc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-294-8124 |
| Primary Part Number | SRDH |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Cross Mfg Co Inc |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN,OPTIONAL END(PIPE) ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Adjustable Pressure Range | +1500.0 TO 3000.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Thread Series Designator | NPTF ALL ENDS |
| Valve Discharge Flow Rate | 30.0 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 |
| Part Number | Manufacturer |
|---|---|
| SRDH | Daico Industries, Inc. Dba Daico Industries Inc (USA) |
| SRDH | Zimmerman Industries, Inc. (USA) |
| SRDH PRIMARY | Cross Mfg Co Inc (USA) |
| Reference | Meaning |
|---|---|
| RD12D | 5/9 Secondary reference Cross Mfg Co Inc |
| RD12D | 5/9 Secondary reference Zimmerman Industries, Inc. |
NSN 4820-01-294-8124 is a Valve,safety Relief, manufactured by Cross Mfg Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-294-8124 has 3 manufacturer part numbers on file: SRDH (Daico Industries, Inc. Dba Daico Industries Inc), SRDH (Zimmerman Industries, Inc.), SRDH (Cross Mfg Co Inc).
Key specifications for SRDH: Flow Control Device: POPPET; Connection Style: PLAIN,OPTIONAL END(PIPE) ALL ENDS; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Adjustable Pressure Range: +1500.0 TO 3000.0 POUNDS PER SQUARE INCH LBS. 9 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.