The Valve,check, cataloged under National Stock Number 4820-01-016-4181, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-016-4181 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-S-763, CLASS 440C, COND A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-S-764, TYPE 303 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-S-764,TYPE303 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Disk Loading Method | SPRING |
| Material | STEEL COMP 303 SEAT |
| Material | STEEL COMP 303 BODY |
| Material | STEEL COMP 440C FLOW CONTROL DEVICE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 187-CKF-005 | 5/9 Secondary reference U.S. Government activity |
| CKFA1876005 | 5/9 Secondary reference U.S. Government activity |
| CKFA1876005A | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-016-4181 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-098-2133, 4820-01-136-0966. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-016-4181: Flow Control Device: BALL; Mounting Position: HORIZONTAL OR VERTICAL; Style Designator: STRAIGHT THRU; Material Document and Classification: QQ-S-763, CLASS 440C, COND A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE. 11 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.