The Valve,check, cataloged under National Stock Number 4820-01-384-6527, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 15 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-384-6527 |
| Primary Part Number | 91-D-078 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 900.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Specification/standard Data | 81349-MIL-V-18436E GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | 900 CLASS AND A STYLE AND 6 TRIM AND 3 TYPE |
| Disk Loading Method | WEIGHT |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| 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 |
|---|---|
| 91-D-078 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| MIL-DTL-18436 | 4/1 Identification reference U.S. Government activity |
| MIL-V-18436 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-384-6527 is a Valve,check, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-384-6527 has 1 manufacturer part number on file: 91-D-078 (Derbyshire Machine & Tool Co).
Key specifications for 91-D-078: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.000 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 15 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.