The Tailpiece,valve, cataloged under National Stock Number 4820-01-187-2255, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-187-2255 |
| Item Name | Tailpiece,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Design Type | ANGLE |
| Valve Model Number for Which Designed | VALVE SEA STANDARD |
| Connection Type | FLANGE, ROUND W/HOLES |
| Operating Pressure | 650.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Valve Size for Which Designed | 6.000 INCHES IN |
| Flange Diameter | 10.875 INCHES IN |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 2640-051 | D/9 Drawing number reference only U.S. Government activity |
| SS845-1889800 | D/9 Drawing number reference only U.S. Government activity |
| SS845-1889800 PIECE 2 | 5/2 Secondary reference U.S. Government activity |
| 2640-051 PIECE 2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-187-2255 is a Tailpiece,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-188-2225, 4730-01-199-8737, 4820-01-211-5352. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-187-2255: Design Type: ANGLE; Valve Model Number for Which Designed: VALVE SEA STANDARD; Connection Type: FLANGE, ROUND W/HOLES; Operating Pressure: 650.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS. 7 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.