The Valve,check, cataloged under National Stock Number 4820-01-504-2503, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-504-2503 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Specification/standard Data | 81349-MIL-V-24630/1A AS MODIFIED BY PSSSN21C-250 GOVERNMENT SPECIFICATION A |
| Disk Loading Method | SPRING |
| Material | STEEL COMP 304 BODY |
| 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 |
| Reference | Meaning |
|---|---|
| M24630/1-16 | 2/2 Government specification standardization U.S. Government activity |
| M24630/1A-16 MOD | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-24630/1 | 4/1 Identification reference U.S. Government activity |
| PLC-11535 | D/9 Drawing number reference only U.S. Government activity |
| PLC-11535-16 | 5/1 Secondary reference U.S. Government activity |
| MIL-V-24630/1A | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-504-2503 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-504-2503: Mounting Position: HORIZONTAL OR VERTICAL; Style Designator: STRAIGHT THRU; Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Specification/standard Data: 81349-MIL-V-24630/1A AS MODIFIED BY PSSSN21C-250 GOVERNMENT SPECIFICATION A. 7 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.