The Cap,valve, cataloged under National Stock Number 4820-01-435-6130, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Superior Valve Co. Government technical data includes 3 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-435-6130 |
| Primary Part Number | P591WA-31 |
| Item Name | Cap,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Superior Valve Co |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Valve Model Number for Which Designed | 591WA-11ST |
| Valve Size for Which Designed | 1.125 INCHES IN |
| 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 |
|---|---|
| P591WA-31 PRIMARY | Superior Valve Co (USA) |
| 591WA-11ST IT 8 | Superior Valve Co (USA) |
| Reference | Meaning |
|---|---|
| 591WA-11ST | D/9 Drawing number reference only Superior Valve Co |
NSN 4820-01-435-6130 is a Cap,valve, manufactured by Superior Valve Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-435-6130 has 2 manufacturer part numbers on file: P591WA-31 (Superior Valve Co), 591WA-11ST IT 8 (Superior Valve Co).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-435-6131. Verify interchangeability with system specifications before substitution.
Key specifications for P591WA-31: Valve Type for Which Designed: BALL; Valve Model Number for Which Designed: 591WA-11ST; Valve Size for Which Designed: 1.125 INCHES IN; End Item Identification: STRATEGIC SEALIFT CONVERSION SHIPS CLASS. 3 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.