The Valve,check, cataloged under National Stock Number 4820-01-672-5201, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Delaware Mfg Industries Corp. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Delaware Mfg Industries Corp (CAGE 0JVY1); Lake Shore Systems, Inc. (CAGE 34712) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-672-5201 |
| Primary Part Number | CVH 65-1000S11 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Delaware Mfg Industries Corp |
| Status | ACTIVE |
| 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 |
|---|---|
| CVH 65-1000S11 PRIMARY | Delaware Mfg Industries Corp (USA) |
| F180523 RVE J NO 53 | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| F180523 | D/9 Drawing number reference only Lake Shore Systems, Inc. |
NSN 4820-01-672-5201 is a Valve,check, manufactured by Delaware Mfg Industries Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-672-5201 has 2 manufacturer part numbers on file: CVH 65-1000S11 (Delaware Mfg Industries Corp), F180523 RVE J NO 53 (Lake Shore Systems, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4810-01-688-5134, 4810-01-688-5141. Verify interchangeability with system specifications before substitution.
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.