The Valve,safety Relief, cataloged under National Stock Number 4820-01-299-4024, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 24 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-299-4024 |
| Primary Part Number | D50C 165PSI SET,NMP1531OPT-C |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 3.125 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 2.625 INCHES FIRST END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.625 INCHES ALL ENDS IN |
| Valve Size | 0.500 INCHES IN |
| Adjustable Pressure Range | +156.0 TO 186.0 POUNDS PER SQUARE INCH LBS |
| Second Connection Face to Centerline Distance | 3.250 INCHES IN |
| Nominal Outside Diameter | 3.750 INCHES FIRST END IN |
| Nominal Outside Diameter | 4.250 INCHES SECOND END IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| First Connection Face to Centerline Distance | 3.312 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING STEM |
| Raised Face Nominal Diameter | 2.000 INCHES SECOND END IN |
| Raised Face Nominal Diameter | 1.375 INCHES FIRST END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.250 INCHES FIRST END IN |
| Raised Face Nominal Height | 0.062 INCHES SECOND END IN |
| Nominal Thickness | 0.375 INCHES SECOND END IN |
| Nominal Thickness | 0.562 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 |
|---|---|
| D50C 165PSI SET,NMP1531OPT-C PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| Reference | Meaning |
|---|---|
| D50C 165PSI SET,NMP1531OPT-C | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
NSN 4820-01-299-4024 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-299-4024 has 1 manufacturer part number on file: D50C 165PSI SET,NMP1531OPT-C (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for D50C 165PSI SET,NMP1531OPT-C: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 3.125 INCHES SECOND END IN. 24 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.