The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-425-7849, 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 25 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. 3 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 | 4820-01-425-7849 |
| Primary Part Number | MDFPMX-3150-3W |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Third End Flange Outside Diameter | 11.000 INCHES NOMINAL IN |
| Second End Relationship with First End | IDENTICAL |
| Remote Actuation Method | BELLOWS |
| Body Style | TEE |
| Face to Face Distance | 20.000 INCHES NOMINAL IN |
| First End Flange Thickness | 0.812 INCHES MINIMUM IN |
| First End Flange Outside Diameter | 11.000 INCHES NOMINAL IN |
| Third End Relationship with Preceding Ends | NOT IDENTICAL WITH FIRST OR SECOND END |
| First End Style Designator | PLAIN |
| First End Bolt Circle Diameter | 9.500 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| End Connection Quantity | 3 |
| Valve Loading Method | SPRING |
| Third End Flange Thickness | 0.812 INCHES MINIMUM IN |
| Third End Bolt Circle Diameter | 9.500 INCHES NOMINAL IN |
| First End Connection Type | PLAIN FACE FLANGE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Third End Flange Shape Style | ROUND W/ BOLT HOLES |
| Third End Connection Type | PLAIN FACE FLANGE |
| Material | BRONZE SEAT |
| Material | NICKEL ALLOY STEM |
| Media for Which Designed | WATER, SALT |
| Third End Style Designator | PLAIN |
| Outlet Pressure Setting | ERR-060 |
| 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 |
|---|---|
| MDFPMX-3150-3W PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
NSN 4820-01-425-7849 is a Valve,regulating,fluid Pressure, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-425-7849 has 1 manufacturer part number on file: MDFPMX-3150-3W (Metrex Valve Corp. Dba Metrex Valve Corp).
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-426-0251, 4730-01-426-0260, 4730-01-426-0263. Verify interchangeability with system specifications before substitution.
Key specifications for MDFPMX-3150-3W: Flow Control Device: DISK; Third End Flange Outside Diameter: 11.000 INCHES NOMINAL IN; Second End Relationship with First End: IDENTICAL; Remote Actuation Method: BELLOWS. 25 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.