The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-239-3633, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-239-3633 |
| Primary Part Number | WE-00149-12W1 ITEM 4VM |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Reference Number Differentiating Characteristics | MAGNETIC PERMEABILITY SHALL NOT EXCEED 2.0 AFTER FABRICATION |
| 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 |
|---|---|
| WE-00149-12W1 ITEM 4VM | Naval Inventory Control Point Mechanicsburg (USA) |
| WA-00194-24D9W1AVM | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| WE-00194-12W1 ITEM 4 | 3/1 Design control — primary reference Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div |
| WA-00194-24D9W1A | 5/1 Secondary reference Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div |
NSN 4820-01-239-3633 is a Valve,relief,pressure and Temper, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-239-3633 has 2 manufacturer part numbers on file: WE-00149-12W1 ITEM 4VM (Naval Inventory Control Point Mechanicsburg), WA-00194-24D9W1AVM (Naval Inventory Control Point Mechanicsburg).
Key specifications for WE-00149-12W1 ITEM 4VM: Reference Number Differentiating Characteristics: MAGNETIC PERMEABILITY SHALL NOT EXCEED 2.0 AFTER FABRICATION. 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.