The Valve,safety Relief, cataloged under National Stock Number 4820-00-146-9341, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-146-9341 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK OR STEM |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Flange Face Design | PLAIN SECOND END |
| Bolt Circle Nominal Diameter | 7.500 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 7.687 INCHES SECOND END IN |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.812 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 1.062 INCHES FIRST END IN |
| Valve Size | 1.500 INCHES IN |
| Bonnet Type | INSIDE SPRING |
| Second Connection Face to Centerline Distance | 7.750 INCHES IN |
| Nominal Outside Diameter | 9.250 INCHES SECOND END IN |
| Nominal Outside Diameter | 9.625 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Mounting Facility | BRACKET(S) |
| Bolt Hole Quantity | 9 SECOND END |
| Bolt Hole Quantity | 8 FIRST END |
| Bonnet Attachment Method | BOLTED |
| First Connection Face to Centerline Distance | 7.000 INCHES IN |
| Raised Face Nominal Diameter | 6.375 INCHES FIRST END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.687 INCHES FIRST END IN |
| Nominal Thickness | 0.937 INCHES SECOND END IN |
| Nominal Thickness | 1.625 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 |
|---|---|
| 5VRP72 | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
| 1553 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4820-00-146-9341 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-038-8884. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-146-9341: Flow Control Device: DISK OR STEM; Flange Shape: ROUND WITH HOLES FIRST END; Flange Shape: ROUND WITH HOLES SECOND END; Flange Face Design: PLAIN SECOND END. 25 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.