The Valve,check, cataloged under National Stock Number 4820-01-080-0591, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tld Ace Corp Div Tld Ace. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-080-0591 |
| Primary Part Number | 1001801 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tld Ace Corp Div Tld Ace |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Style Designator | STRAIGHT THRU |
| Face to Face Distance | 5.250 INCHES IN |
| First Connection Face to Centerline Distance | 3.812 INCHES IN |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 1001801 PRIMARY | Tld Ace Corp Div Tld Ace (USA) |
| Reference | Meaning |
|---|---|
| T-413-Y2 | 5/9 Secondary reference Nibco Inc |
| T-413-W2 | 5/9 Secondary reference Nibco Inc |
NSN 4820-01-080-0591 is a Valve,check, manufactured by Tld Ace Corp Div Tld Ace, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-080-0591 has 1 manufacturer part number on file: 1001801 (Tld Ace Corp Div Tld Ace).
4 possible matches (shared part number, not a government interchangeability claim): 6695-01-256-8373, 6620-01-385-4362, 6220-01-415-7637. Verify interchangeability with system specifications before substitution.
Key specifications for 1001801: Flow Control Device: DISK; Style Designator: STRAIGHT THRU; Face to Face Distance: 5.250 INCHES IN; First Connection Face to Centerline Distance: 3.812 INCHES IN. 5 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.