The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-428-9891, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-428-9891 |
| Primary Part Number | MDFPM-3170-FL-3W |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| First End Bolt Hole Quantity | 8 |
| Flow Control Device | BELLOWS |
| Second End Relationship with First End | IDENTICAL |
| Remote Actuation Method | DIAPHRAGM |
| Body Style | TEE |
| Face to Face Distance | 32.375 INCHES NOMINAL IN |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Flange Thickness | 1.125 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 13.500 INCHES NOMINAL IN |
| Third End Relationship with Preceding Ends | IDENTICAL WITH FIRST END |
| First End Style Designator | PLAIN |
| Temp Rating | 90.0 FAHRENHEIT MINIMUM AND 180.0 FAHRENHEIT MAXIMUM DEGF |
| First Connection Face to Centerline Distance | 10.375 INCHES NOMINAL IN |
| First End Bolt Hole Diameter | 0.875 INCHES NOMINAL IN |
| First End Bolt Circle Diameter | 11.750 INCHES NOMINAL IN |
| End Connection Quantity | 3 |
| Valve Loading Method | BELLOWS |
| First End Connection Type | PLAIN FACE FLANGE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY STEM |
| Material | COPPER ALLOY SEAT |
| Media for Which Designed | REFRIGERANT R-22 |
| Maximum Inlet Pressure Rating | ERR-060 |
| Filter | NOT INCLUDED |
| 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 |
|---|---|
| MDFPM-3170-FL-3W PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
NSN 4820-01-428-9891 is a Valve,regulating,fluid Pressure, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-428-9891 has 1 manufacturer part number on file: MDFPM-3170-FL-3W (Metrex Valve Corp. Dba Metrex Valve Corp).
Key specifications for MDFPM-3170-FL-3W: First End Bolt Hole Quantity: 8; Flow Control Device: BELLOWS; Second End Relationship with First End: IDENTICAL; Remote Actuation Method: DIAPHRAGM. 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.