The Valve,gate, cataloged under National Stock Number 4820-00-287-2840, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 16 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-287-2840 |
| Primary Part Number | 5S1550ALT1 |
| Item Name | Valve,gate |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Inlet Relationship with Outlet | IDENTICAL |
| Flange Face Design | PLAIN |
| Stem Type | RISING |
| Connection Type | FLANGE, ROUND W/HOLES |
| Valve Size | 8.000 INCHES IN |
| Features Provided | BONNET PACKING AND VALVE STEM LOCK SHIELD |
| Bonnet Type | OUTSIDE SCREW-YOKE |
| Bolt Hole Quantity | 14 |
| Flange Diameter | 12.375 INCHES IN |
| Bonnet Attachment Method | BOLTED |
| Face to Face Distance | 9.500 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY SEAT |
| Material | NICKEL ALLOY DISK |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 5S1550ALT1 PRIMARY | Naval Sea Systems Command (USA) |
| 1305-8IN/1305NOREV/882049406 PRIMARY | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| A47040 | 5/9 Secondary reference Crane Co Crane Valve and Parts Div |
| 5S1550ALT1 | 5/9 Secondary reference U.S. Government activity |
| 1305-8IN/1305N0 | C/1 Advisory reference — outside the item-of-supply concept Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| MILV1189 | 4/1 Identification reference U.S. Government activity |
| NB-0102-H-0800 | C/1 Advisory reference — outside the item-of-supply concept Pima Valve, Llc |
| EE-3755REVC 8 IN CID882049334 | 3/2 Design control — primary reference U.S. Government activity |
| NB0102E 8IN | C/1 Advisory reference — outside the item-of-supply concept Pima Valve, Llc |
NSN 4820-00-287-2840 is a Valve,gate, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-287-2840 has 2 manufacturer part numbers on file: 5S1550ALT1 (Naval Sea Systems Command), 1305-8IN/1305NOREV/882049406 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-234-0089. Verify interchangeability with system specifications before substitution.
Key specifications for 5S1550ALT1: Inlet Relationship with Outlet: IDENTICAL; Flange Face Design: PLAIN; Stem Type: RISING; Connection Type: FLANGE, ROUND W/HOLES. 16 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.