The Valve,regulating,system Pressure, cataloged under National Stock Number 4820-01-491-8857, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Siemens Corp. Government technical data includes 6 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-491-8857 |
| Primary Part Number | 201-1001 |
| Item Name | Valve,regulating,system Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Siemens Corp |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| End Connection Quantity | 1 |
| Material | ZINC BODY |
| Media for Which Designed | AIR |
| Furnished Items | OUTLET PRESSURE GAGE |
| Filter | INCLUDED |
| 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 |
|---|---|
| 201-1001 PRIMARY | Siemens Corp (USA) |
NSN 4820-01-491-8857 is a Valve,regulating,system Pressure, manufactured by Siemens Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-491-8857 has 1 manufacturer part number on file: 201-1001 (Siemens Corp).
Key specifications for 201-1001: Flow Control Device: DIAPHRAGM; End Connection Quantity: 1; Special Features: SINGLE-STAGE, COMPRESSED AIR PRESSURE REDUCING VALVE; 200 MESH STAINLESS STRAINER; LOCKING HANDLE; Material: ZINC BODY. 6 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.