The Valve,safety Relief, cataloged under National Stock Number 4820-01-346-1132, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-346-1132 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Media for Which Designed | WATER, FRESH FIRST RESPONSE |
| Media for Which Designed | STEAM SECOND RESPONSE |
| Material | BRONZE BODY |
| Opening Pressure Setting | 100.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 790-100 | 3/9 Design control — primary reference Itt Bell and Gosset-Hydronics a Unit of Itt Fluid Handling Div |
NSN 4820-01-346-1132 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-346-1132: Flow Control Device: DISK; Special Features: INLET SZ 0.750 IN.,OUTLET SZ 0.750 IN.; ASME RATING BTUH 2,075,000; 2.5625 IN. WD; 4.5625 IN. HIGH; MEETS REQUIREMENTS OF SEC 4 OF ASME BOILER & PRESSURE VESSEL CODE; DESIGNED TO PROTECT HYDRONIC HEATING SUSTEMS AGAINST OVER-PRESSURE CONDITIONS,& THEIR LOW DIFFERENTIAL BTWN.OPENING & CLOSING PRESSURES OFFER DEPENDABLE SAFETY PRODUCTION AGAINST DAMAGE CAUSED BY EXCESSIVE THERMAL EXPANSION IN; Media for Which Designed: WATER, FRESH FIRST RESPONSE; Media for Which Designed: STEAM SECOND RESPONSE. 5 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.