The Valve,safety Relief, cataloged under National Stock Number 4820-01-545-4012, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Aqua Environment Co, Inc. Government technical data includes 12 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-545-4012 |
| Primary Part Number | 504 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Aqua Environment Co, Inc |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Nominal Length | 2.100 INCHES ALL ENDS IN |
| Connection Type | THREADED EXTERNAL PIPE ALL ENDS |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +300.0 TO 6000.0 POUNDS PER SQUARE INCH LBS |
| Nominal Thread Size | 0.250 INCHES SECOND END IN |
| Maximum Operating Temp | 160.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Material | ALUMINUM AND COPPER ALLOY AND RUBBER SYNTHETIC OVERALL |
| Thread Series Designator | NPT SECOND 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 |
|---|---|
| 504 SET PRESSURE 3300 | Aqua Environment Co, Inc (USA) |
| 504 PRIMARY | Aqua Environment Co, Inc (USA) |
NSN 4820-01-545-4012 is a Valve,safety Relief, manufactured by Aqua Environment Co, Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-545-4012 has 2 manufacturer part numbers on file: 504 SET PRESSURE 3300 (Aqua Environment Co, Inc), 504 (Aqua Environment Co, Inc).
Key specifications for 504: Flow Control Device: POPPET; Connection Style: PLAIN (PIPE) ALL ENDS; Nominal Length: 2.100 INCHES ALL ENDS IN; Connection Type: THREADED EXTERNAL PIPE ALL ENDS. 12 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.