The Seat,valve, cataloged under National Stock Number 4820-01-193-7709, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Siemens Energy, Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-193-7709 |
| Primary Part Number | A-11503 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Style Designator | THREADED FLANGED |
| Material | COPPER ALLOY 464 OVERALL |
| 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 |
|---|---|
| A-11503 PRIMARY | Siemens Energy, Inc. (USA) |
| FIG 11-39 PIECE 2 | Siemens Energy, Inc. (USA) |
| EW-225B PRIMARY | DC Fabricators Inc (USA) |
| Reference | Meaning |
|---|---|
| EW-225B | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 4820-01-193-7709 is a Seat,valve, manufactured by Siemens Energy, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-193-7709 has 3 manufacturer part numbers on file: A-11503 (Siemens Energy, Inc.), FIG 11-39 PIECE 2 (Siemens Energy, Inc.), EW-225B (DC Fabricators Inc).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-311-4102. Verify interchangeability with system specifications before substitution.
Key specifications for A-11503: Style Designator: THREADED FLANGED; Material: COPPER ALLOY 464 OVERALL. 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.