The Valve,safety Relief, cataloged under National Stock Number 4820-01-063-6301, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mechanical Equipment Company, Inc. Dba Mechanical Equipment Co Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-063-6301 |
| Primary Part Number | 4600277000 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mechanical Equipment Company, Inc. Dba Mechanical Equipment Co Inc |
| Status | ACTIVE |
| FSC Application Data | 1.25IPS 145T 158PSI MPTXFPT BRS |
| 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 |
|---|---|
| 4600277000 | Mechanical Equipment Company, Inc. Dba Mechanical Equipment Co Inc (USA) |
| 1 1-4-1543G | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| 314684 | 3/9 Design control — primary reference Dresser, Inc. Dba Dresser Equipment Group Div Industrial Valve Operations, Dresse |
NSN 4820-01-063-6301 is a Valve,safety Relief, manufactured by Mechanical Equipment Company, Inc. Dba Mechanical Equipment Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-063-6301 has 2 manufacturer part numbers on file: 4600277000 (Mechanical Equipment Company, Inc. Dba Mechanical Equipment Co Inc), 1 1-4-1543G (Ashcroft Inc Dba Heise).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-411-9465, 6750-01-427-3237. Verify interchangeability with system specifications before substitution.
Key specifications for 4600277000: FSC Application Data: 1.25IPS 145T 158PSI MPTXFPT BRS. 1 specification is 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.