The Valve,safety Relief, cataloged under National Stock Number 4820-01-536-4142, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-536-4142 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 LEVER |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 4.437 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.562 INCHES ALL ENDS IN |
| Valve Size | 2.000 INCHES IN |
| Adjustable Pressure Range | +110.0 TO 160.0 POUNDS PER SQUARE INCH LBS |
| Second Connection Face to Centerline Distance | 4.700 INCHES IN |
| Nominal Outside Diameter | 5.562 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 6 ALL ENDS |
| First Connection Face to Centerline Distance | 4.700 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| Nominal Thickness | 0.437 INCHES ALL ENDS 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 |
|---|---|
| BBMGG07MHH | 3/9 Design control — primary reference Danco Valve Company |
| CD2000FF-4 | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
| CD2000FF-4 | 5/9 Secondary reference Danco Valve Company |
| D2000FF | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
| BBMGG07MHH | C/1 Advisory reference — outside the item-of-supply concept Dante Valve Company |
| D2000FF | 5/9 Secondary reference Danco Valve Company |
NSN 4820-01-536-4142 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-622-4746, 4820-01-659-2279. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-536-4142: Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 LEVER; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 4.437 INCHES ALL ENDS IN. 19 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.