The Seat,valve, cataloged under National Stock Number 4820-01-221-1172, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-221-1172 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.123 INCHES NOMINAL IN |
| Flange Diameter | 1.632 INCHES NOMINAL IN |
| Body Outside Diameter | 1.432 INCHES NOMINAL IN |
| Taper Minor Diameter | 0.015 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Style Designator | PLAIN FLANGED |
| Taper Major Diameter | 1.160 INCHES NOMINAL IN |
| Body Inside Diameter | 1.160 INCHES NOMINAL IN |
| Taper Length | 1.145 INCHES NOMINAL IN |
| Under Flange Height | 0.152 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 35.000 NOMINAL |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 803-5001003-X3X2-52 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-221-1172 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-221-1172: Flange Seat to Disk End Height: 0.123 INCHES NOMINAL IN; Flange Diameter: 1.632 INCHES NOMINAL IN; Body Outside Diameter: 1.432 INCHES NOMINAL IN; Taper Minor Diameter: 0.015 INCHES NOMINAL IN. 14 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.
NSN 4820-01-221-1172 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.