The Seat,valve, cataloged under National Stock Number 4820-01-221-7337, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-221-7337 |
| Primary Part Number | 2553-054-069 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Material Document and Classification | ASTM A276 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | STEEL COMP 304 SEAT |
| 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 |
|---|---|
| 23278B ITEM 5A | Velan Valve Corp. (USA) |
| 2553-054-069 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 23278 ITEM 5A | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
NSN 4820-01-221-7337 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-221-7337 has 2 manufacturer part numbers on file: 23278B ITEM 5A (Velan Valve Corp.), 2553-054-069 (Velan Valve Corp.).
Key specifications for 2553-054-069: Material Document and Classification: ASTM A276 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Special Features: VALVE SIZE 0.750 INCHES IN; Material: STEEL COMP 304 SEAT. 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.