The Valve,check, cataloged under National Stock Number 4820-01-478-8817, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-478-8817 |
| Primary Part Number | SS-CHS4-10 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Mounting Position | HORIZONTAL OR VERTICAL |
| 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 |
|---|---|
| SS-CHS4-10 PRIMARY | Swagelok Co (USA) |
| 581525-003 | Pacific Consolidated Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| SS-CHS4-10 | 3/9 Design control — primary reference Nupro Co |
| 581525 | D/9 Drawing number reference only Pacific Consolidated Industries Llc |
| 4820PL0652510 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 4820-01-478-8817 is a Valve,check, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-478-8817 has 2 manufacturer part numbers on file: SS-CHS4-10 (Swagelok Co), 581525-003 (Pacific Consolidated Industries Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-495-6061. Verify interchangeability with system specifications before substitution.
Key specifications for SS-CHS4-10: Mounting Position: HORIZONTAL OR VERTICAL; Special Features: 1/4 SWAGELOK/TEMPERATURE RANGE TO 400DEGREES F.PRESSURE TO 6000 PSI; End Item Identification: 3655NCD019034. 1 specification is 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.