The Valve,safety Relief, cataloged under National Stock Number 4820-01-238-5950, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 28 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-238-5950 |
| Primary Part Number | D49941PART R10AN3P312-BM2 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 7.875 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 10.625 INCHES FIRST END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.875 INCHES ALL ENDS IN |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 4.000 INCHES IN |
| Adjustable Pressure Range | +59.0 TO 72.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Maximum Operating Temp | 425.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 7.688 INCHES IN |
| Nominal Outside Diameter | 10.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 12.500 INCHES FIRST END IN |
| Bolt Hole Quantity | 8 SECOND END |
| Bolt Hole Quantity | 12 FIRST END |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| First Connection Face to Centerline Distance | 8.000 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Material | STEEL CORROSION RESISTING STEM |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 1.250 INCHES SECOND END IN |
| Nominal Thickness | 1.438 INCHES FIRST END IN |
| 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 |
|---|---|
| D49941PART R10AN3P312-BM2 PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| R10AN3P311-BM2 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
| D49941 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
| D49941PART R10AN3P312-BM2 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10AN3P312-BM2- | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-238-5950 is a Valve,safety Relief, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-238-5950 has 1 manufacturer part number on file: D49941PART R10AN3P312-BM2 (Hunt Valve Company, Inc.).
Key specifications for D49941PART R10AN3P312-BM2: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 7.875 INCHES SECOND END IN. 28 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.