The Valve,safety Relief, cataloged under National Stock Number 4820-01-202-5588, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 28 specifications, cited from the U.S. Government catalog. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-202-5588 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 7.875 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 7.500 INCHES SECOND END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.875 INCHES FIRST END IN |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 4.000 INCHES IN |
| Bonnet Type | INSIDE SCREW |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 4.000 INCHES FIRST END IN |
| Maximum Operating Temp | 406.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 6.438 INCHES IN |
| Nominal Outside Diameter | 9.000 INCHES SECOND END IN |
| Nominal Outside Diameter | 10.000 INCHES FIRST END IN |
| Bolt Hole Quantity | 8 ALL ENDS |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| First Connection Face to Centerline Distance | 6.812 INCHES IN |
| Material | BRONZE BODY |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 72.0 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.688 INCHES SECOND END IN |
| Nominal Thickness | 1.062 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 |
| Reference | Meaning |
|---|---|
| A1944 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| GBFBLM | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| DX52FF-05-04 | 5/9 Secondary reference Danco Valve Company |
| GBFGLM22-AS0072 | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| BGSKK05SMM | 3/9 Design control — primary reference Danco Valve Company |
| 44W206.5CXL-A1944-4X4 SET72PSI | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| A1944-4X4 CXL565T72PSI | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| CBFGLM | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| GBFGLM | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| BGSKK05SMM | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
NSN 4820-01-202-5588 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
7 possible matches (shared part number, not a government interchangeability claim): 4820-01-203-2474, 4820-01-203-2478, 4820-01-204-0624. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-202-5588: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN SECOND END; Bolt Circle Nominal Diameter: 7.875 INCHES FIRST 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.