The Valve,safety Relief, cataloged under National Stock Number 4820-00-147-1745, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-147-1745 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | FLARED (TUBE) FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Maximum Operating Temp | 225.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Material | STEEL BODY |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR AND STEEL FLOW CONTROL DEVICE |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) 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 |
| Reference | Meaning |
|---|---|
| 6153-100 | 3/9 Design control — primary reference Air Dry Co of America, Llc |
| 6153-100 | 3/2 Design control — primary reference U.S. Government activity |
| 129480FIG129-1-2-SET165 | 5/9 Secondary reference F.c.kingston Co. Dba Storm Manufacturing |
| 129480FIG129SET165 | 5/9 Secondary reference F.c.kingston Co. Dba Storm Manufacturing |
| 6153-1S | 5/9 Secondary reference Air Dry Co of America, Llc |
| 129480SS | 5/9 Secondary reference Air Dry Co of America, Llc |
NSN 4820-00-147-1745 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-147-1745: Flow Control Device: DISK; Connection Style: FLARED (TUBE) FIRST END; Style Designator: ANGLE; Operating Pressure: 225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 17 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.