The Valve,check, cataloged under National Stock Number 4820-01-086-4049, 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 14 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-086-4049 |
| Primary Part Number | SS845-2110245 ASSEMBLY 7DA 1INCH |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET WITH BRAZING RING (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | MIL-B-21230 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-C-390,ALLOY D4 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 700.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 400.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY 922 FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| SS845-2110245 ASSEMBLY 7DA 1INCH PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2620-927X4 ASSYDA 1IN | 5/9 Secondary reference U.S. Government activity |
| 2620-927X4 ASSYDA 1IN | 3/9 Design control — primary reference National Oilwell |
| SS845-2110245RE | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| SS845-2110245 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2620-927X4ASSY7 | C/1 Advisory reference — outside the item-of-supply concept National Oilwell |
NSN 4820-01-086-4049 is a Valve,check, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-086-4049 has 1 manufacturer part number on file: SS845-2110245 ASSEMBLY 7DA 1INCH (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-093-7911. Verify interchangeability with system specifications before substitution.
Key specifications for SS845-2110245 ASSEMBLY 7DA 1INCH: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.000 INCHES ALL ENDS IN; Connection Style: SOCKET WITH BRAZING RING (PIPE) ALL ENDS; Mounting Position: HORIZONTAL. 14 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.