The Stem,fluid Valve, cataloged under National Stock Number 4820-01-435-6131, 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 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-435-6131 |
| Primary Part Number | P591WA-2 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Superior Valve Co |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Stem Actuating End Type | SOCKET |
| 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 |
|---|---|
| 591WA-11ST IT 5 | Superior Valve Co (USA) |
| P591WA-2 PRIMARY | Superior Valve Co (USA) |
| Reference | Meaning |
|---|---|
| 591WA-11ST | D/9 Drawing number reference only Superior Valve Co |
NSN 4820-01-435-6131 is a Stem,fluid Valve, manufactured by Superior Valve Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-435-6131 has 2 manufacturer part numbers on file: 591WA-11ST IT 5 (Superior Valve Co), P591WA-2 (Superior Valve Co).
Key specifications for P591WA-2: Valve Type for Which Designed: BALL; Stem Actuating End Type: SOCKET; Valve Model Number for Which Designed: 591WA-11ST; Valve Size for Which Designed: 1.125 INCHES IN. 4 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.