The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-459-6788, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-459-6788 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | ANY ACCEPTABLE |
| First End Thread Series Designator | NPT |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Offset Distance | 7.220 INCHES NOMINAL IN |
| Body Style | ANGLE W/ OFFSET GIVE "ADQM" "ADQN" AND "ADAP" ONLY IF FLANGED ALL ENDS |
| First End Style Designator | PLAIN |
| End Connection Quantity | 1 |
| Opening Pressure Setting | ERR-060 |
| Temp Control Device Type | THERMOSTATIC |
| First End Connection Type | THREADED EXTERNAL PIPE |
| Temp Adjustability | NOT ADJUSTABLE |
| First End Nominal Pipe Size Accommodated | 0.500 INCHES IN |
| Material | STEEL BODY |
| First End Nominal Thread Size | 0.250 INCHES 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 |
|---|---|
| M5132N-4M(L)-150 | 5/9 Secondary reference U.S. Government activity |
| 7245940 FIND 35 | 3/1 Design control — primary reference Naval Sea Systems Command |
| M5132N-4M(L)-150 ASME | 3/2 Design control — primary reference U.S. Government activity |
| M5132N-4M(L)-15 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 7245940 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-459-6788 is a Valve,relief,pressure and Temper, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 6685-01-461-0567, 4310-01-465-1507, 4730-01-511-6496. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-459-6788: Flow Control Device: ANY ACCEPTABLE; First End Thread Series Designator: NPT; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL. 15 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.