The Valve,safety Relief, cataloged under National Stock Number 4820-01-237-6170, 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17 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-237-6170 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | SOCKET (TUBE) ALL ENDS |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 1.500 INCHES ALL ENDS IN |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +272.0 TO 300.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SCREW |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | GAS, INERT SECOND RESPONSE |
| Media for Which Designed | AIR FIRST RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING STEM |
| Material | NICKEL ALLOY OR STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY OR STEEL CORROSION RESISTING 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 | X |
| Reference | Meaning |
|---|---|
| D48671 PART R10BH1H120 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| R10BH1H120 AND | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
| D48671 PART R10BH1H120 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-237-6170 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-237-6170: Flow Control Device: DISK; Connection Style: SOCKET (TUBE) ALL ENDS; Connection Type: UNTHREADED INTERNAL TUBE ALL ENDS; Style Designator: ANGLE. 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.