The Valve,ball, cataloged under National Stock Number 4820-01-474-0465, 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 20 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-474-0465 |
| Primary Part Number | 556-6408988-AYB W/LK DVC AYAB |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 LOCKING DEVICE AND 1 HANDLE |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Connection Style | SOCKET ALL ENDS |
| Minimum Operating Temp | 0.0 FAHRENHEIT DEGF |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | ASTM-A351 GR-CF3M ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | POLYMER MYLATRON GSVD MFR REF SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-C-465 ALY-C63200 FORM-ROD FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-S-763 CL 304 CD A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bonnet Type | PACKING RETAINING |
| Maximum Operating Temp | 180.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | HYDRAULIC FLUID, MINERAL BASE SINGLE RESPONSE |
| Material | PLASTIC SEAT |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING BODY |
| Material | COPPER ALLOY 632 STEM |
| Valve Operation Method | MANUAL |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY ADDING P/N 264378505ASSYAB WHICH IS PIN LOCKING DEVICE ASSEMBLY AB (LOCKED OPEN) |
| 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 |
|---|---|
| 556-6408988-AYB W/LK DVC AYAB | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6408988 | D/9 Drawing number reference only Naval Sea Systems Command |
| 264378505-ASSYB | 3/1 Design control — primary reference U.S. Government activity |
| 2643-785-05 ASSY B W/LK DV AY AB | 5/2 Secondary reference U.S. Government activity |
| 556-6408988 ASSY B | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-474-0465 is a Valve,ball, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-474-0465 has 1 manufacturer part number on file: 556-6408988-AYB W/LK DVC AYAB (Naval Sea Systems Command).
Key specifications for 556-6408988-AYB W/LK DVC AYAB: Furnished Items and Quantity: 1 LOCKING DEVICE AND 1 HANDLE; Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Connection Style: SOCKET ALL ENDS; Minimum Operating Temp: 0.0 FAHRENHEIT DEGF. 20 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.