The Valve,check, cataloged under National Stock Number 4820-00-052-0840, 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 8 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-052-0840 |
| Primary Part Number | SS845-2110235ASSY8DA1INL1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.000 INCHES FIRST END IN |
| Connection Style | SOCKET WITH BRAZING RING (PIPE) FIRST END |
| Criticality Code Justification | ZZZY |
| Style Designator | STRAIGHT THRU |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Valve Operation Method | AUTOMATIC |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| SS845-2110235ASSY8DA1INL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| NS-4038ASSYIA 1INL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2620-927X1ASSY8DAL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2621-927-01ASSY1A1INL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| NS-4038ASSYIA 1IN | 5/9 Secondary reference National Oilwell |
| 2621-927-01ASSY1A1IN | 3/1 Design control — primary reference National Oilwell |
| NS-4038ASSYIA 1IN | 5/1 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| 2620-927X1ASSY8DA | 5/1 Secondary reference National Oilwell |
| SS845-2110235ASSY8DA1IN | 5/1 Secondary reference U.S. Government activity |
| 2621-927-01ASSY1A1IN | 5/9 Secondary reference U.S. Government activity |
| 2620-927X1ASSY8DA | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-052-0840 is a Valve,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-052-0840 has 4 manufacturer part numbers on file: SS845-2110235ASSY8DA1INL1 (Naval Inventory Control Point Mechanicsburg), NS-4038ASSYIA 1INL1 (Naval Inventory Control Point Mechanicsburg), 2620-927X1ASSY8DAL1 (Naval Inventory Control Point Mechanicsburg), 2621-927-01ASSY1A1INL1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for SS845-2110235ASSY8DA1INL1: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.000 INCHES FIRST END IN; Connection Style: SOCKET WITH BRAZING RING (PIPE) FIRST END; Criticality Code Justification: ZZZY. 8 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.
NSN 4820-00-052-0840 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.