The Seat,valve, cataloged under National Stock Number 4820-01-541-7527, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-541-7527 |
| Primary Part Number | 7550478-PLC-11401-005D4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P-9290 SYSTEM CERTIFICATION PRODURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICLES AS DIFFERENTIATED BY SPECIAL TEST FEATURES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 7550478-PLC-11401-005D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 025461DCD4 | Naval Inventory Control Point Mechanicsburg (USA) |
| G547-0002-PLC-11401-005D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| PLC-11401-005D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 025461DC | 5/1 Secondary reference U.S. Government activity |
| PLC-11401-005 | 5/1 Secondary reference U.S. Government activity |
| G547-0002-PLC-11401-005 | 5/1 Secondary reference U.S. Government activity |
| 7550478-PLC-11401-005 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-541-7527 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-541-7527 has 4 manufacturer part numbers on file: 7550478-PLC-11401-005D4 (Naval Inventory Control Point Mechanicsburg), 025461DCD4 (Naval Inventory Control Point Mechanicsburg), G547-0002-PLC-11401-005D4 (Naval Inventory Control Point Mechanicsburg), PLC-11401-005D4 (Naval Inventory Control Point Mechanicsburg).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-640-7456, 4820-01-687-0895. Verify interchangeability with system specifications before substitution.
Key specifications for 7550478-PLC-11401-005D4: Criticality Code Justification: ZZZY; Part Name Assigned by Controlling Agency: ASSEMBLY, IN-LINE GAGE ROOT VALVES, .250 N.P.S.; End Item Identification: VALVE, GLOBE 0.25IPS; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P-9290 SYSTEM CERTIFICATION PRODURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICLES AS DIFFERENTIATED BY SPECIAL TEST FEATURES. 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.