The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-567-7934, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 4 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-567-7934 |
| Primary Part Number | 31M-19-1B |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| Pressure Rating | 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Style Designator | SPECIAL SHAPED |
| Media for Which Designed | WATER |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 31M-19-1B PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
| MDFPM-3000-3W ITEM 21 | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| MDFPM-3000-3W | D/9 Drawing number reference only Metrex Valve Corp. Dba Metrex Valve Corp |
NSN 4820-01-567-7934 is a Diaphragm,actuator Valve,special, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-567-7934 has 2 manufacturer part numbers on file: 31M-19-1B (Metrex Valve Corp. Dba Metrex Valve Corp), MDFPM-3000-3W ITEM 21 (Metrex Valve Corp. Dba Metrex Valve Corp).
Key specifications for 31M-19-1B: Pressure Rating: 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Style Designator: SPECIAL SHAPED; Media for Which Designed: WATER; Part Name Assigned by Controlling Agency: DIAPHRAGM LOWER. 4 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.