The Valve,check, cataloged under National Stock Number 4820-00-588-7631, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Honeywell Intl Inc Defense Avionics Systems. Government technical data includes 10 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-588-7631 |
| Primary Part Number | 557-4D |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Honeywell Intl Inc Defense Avionics Systems |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | BEADED (HOSE) ALL ENDS |
| Mounting Position | VERTICAL |
| Connection Type | UNTHREADED EXTERNAL HOSE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Disk Loading Method | SPRING |
| Surface Treatment | PAINT |
| Material | RUBBER SYNTHETIC FLOW CONTROL DEVICE |
| Material | ALUMINUM ALLOY 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 |
| Part Number | Manufacturer |
|---|---|
| 557-4D PRIMARY | Honeywell Intl Inc Defense Avionics Systems (USA) |
NSN 4820-00-588-7631 is a Valve,check, manufactured by Honeywell Intl Inc Defense Avionics Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-588-7631 has 1 manufacturer part number on file: 557-4D (Honeywell Intl Inc Defense Avionics Systems).
Key specifications for 557-4D: Flow Control Device: DISK; Connection Style: BEADED (HOSE) ALL ENDS; Mounting Position: VERTICAL; Connection Type: UNTHREADED EXTERNAL HOSE ALL ENDS. 10 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.