The Valve,safety Relief, cataloged under National Stock Number 4820-01-305-5757, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emglo Products Corp. Government technical data includes 6 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. 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 | 4820-01-305-5757 |
| Primary Part Number | 48633 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emglo Products Corp |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Disk Loading Method | SPRING |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Opening Pressure Setting | 250.0 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 |
|---|---|
| 48633 PRIMARY | Emglo Products Corp (USA) |
NSN 4820-01-305-5757 is a Valve,safety Relief, manufactured by Emglo Products Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-305-5757 has 1 manufacturer part number on file: 48633 (Emglo Products Corp).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-327-7648. Verify interchangeability with system specifications before substitution.
Key specifications for 48633: Flow Control Device: DISK; Operating Pressure: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Disk Loading Method: SPRING; Special Features: VALVE SIZE 0.250 IN. IN. 6 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.