The Disk,valve, cataloged under National Stock Number 4820-01-540-1497, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-540-1497 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Pressure Rating | 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Temp Rating | 366.0 FAHRENHEIT MAXIMUM DEGF |
| Material Document and Classification | TFE MFR REF SINGLE MATERIAL RESPONSE |
| Media for Which Designed | STEAM |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| S-235-Y PT 11, 12, 13 .25IN | 5/9 Secondary reference Nibco Inc |
| S-235-Y PT 11, 12, 13 .25IN | 5/9 Secondary reference Nibco Inc |
| S-235-Y PT 11, 12, 13 .25IN | C/1 Advisory reference — outside the item-of-supply concept Nibco Inc Chemtrol Div |
| R015454 ASBLY | 3/9 Design control — primary reference Nibco Inc |
| R015454 ASBLY | C/1 Advisory reference — outside the item-of-supply concept Nibco Inc Chemtrol Div |
| R015454 ASBLY | 5/9 Secondary reference Nibco Inc |
NSN 4820-01-540-1497 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-540-1497: Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 366.0 FAHRENHEIT MAXIMUM DEGF; Material Document and Classification: TFE MFR REF SINGLE MATERIAL RESPONSE; Special Features: THIS IS AN ASSEMBLY OF DISK, DISK HOLDER AND DISK NUT; MATERIAL OF DISK HOLDER IS BRONZE ASTM B 62; MATERIAL OF DISK NUT IS BRONZE ASTM B 62/ASTM B98 ALLOY C65100 WITH STAINLESS STEEL WASHER; NEXT HIGHER ASSEMBLY S-235-Y 1.25 IN IN. 5 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.