The Valve,safety Relief, cataloged under National Stock Number 4820-01-236-5974, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-236-5974 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 LEVER |
| Nominal Pipe Size Accommodated | 1.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET WITH BRAZING RING ALL ENDS |
| Criticality Code Justification | FEAT |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM B-61 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +27.0 TO 33.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SCREW |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| 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 | Y |
| Reference | Meaning |
|---|---|
| D50854 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D48663 1IN | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10AF1F108-BM1 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
| D50854 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| BBSAA04SEE | 5/9 Secondary reference Dante Valve Company |
| R10AF1F108 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| BBSAA04SEE | 5/9 Secondary reference Danco Valve Company |
NSN 4820-01-236-5974 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5995-01-525-2967. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-236-5974: Flow Control Device: DISK; Furnished Items and Quantity: 1 LEVER; Nominal Pipe Size Accommodated: 1.000 INCHES ALL ENDS IN; Connection Style: SOCKET WITH BRAZING RING ALL ENDS. 21 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.