The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-484-1639, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is R F Products, Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-01-484-1639 |
| Primary Part Number | 643030 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | R F Products, Inc |
| Status | ACTIVE |
| Mounting Facility | EXTERNAL THREAD |
| Material | COPPER ALLOY AND NICKEL OUTSIDE |
| 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 |
|---|---|
| 643030 PRIMARY | R F Products, Inc (USA) |
NSN 4820-01-484-1639 is a Valve,regulating,fluid Pressure, manufactured by R F Products, Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-484-1639 has 1 manufacturer part number on file: 643030 (R F Products, Inc).
1 possible match (shared part number, not a government interchangeability claim): 4330-01-511-8316. Verify interchangeability with system specifications before substitution.
Key specifications for 643030: Mounting Facility: EXTERNAL THREAD; Special Features: OP PRESSURE MAX 200 PSI; 0.125 IN NPT THD FOR MTG; 0.302-32 NS THD FOR SEALING CAP; LGTH 0.880 IN; HEX DIA 0.440 IN; ALLOWS PRESSURIZING OF FILTERS P/N 643000-04, -05, AND 644800 FOR ELECTRONIC PURPOSES OR ALLOWING THE UNIT TO PERFORM AT HIGHER POWER LEVELS IN; End Item Identification: USED ON E-3A AWACS AIRCRAFT A; Material: COPPER ALLOY AND NICKEL OUTSIDE. 2 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.