The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-312-1908, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 23 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-312-1908 |
| Primary Part Number | U303933401 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Leslie Controls, Inc. Dba Leslie Controls Inc |
| Status | ACTIVE |
| First End Bolt Hole Quantity | 8 |
| Flow Control Device | DISK |
| Second End Relationship with First End | IDENTICAL |
| Remote Actuation Method | PISTON |
| Body Style | STRAIGHT THRU |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Flange Thickness | 1.125 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 7.500 INCHES NOMINAL IN |
| First End Style Designator | RAISED |
| First End Bolt Hole Diameter | 0.875 INCHES NOMINAL IN |
| First End Raised Face Diameter | 4.125 INCHES NOMINAL IN |
| First End Bolt Circle Diameter | 5.875 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| Valve Loading Method | SPRING |
| First End Connection Type | RAISED FACE FLANGE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| First End Raised Face Height | 0.250 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Media for Which Designed | STEAM |
| Maximum Inlet Pressure Rating | ERR-060 |
| Outlet Pressure Setting | 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 |
|---|---|
| U303933401 PRIMARY | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| L5-5 FOR TCEP | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| QLS-5 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| QLS-5-2.5IN | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
NSN 4820-01-312-1908 is a Valve,regulating,fluid Pressure, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-312-1908 has 1 manufacturer part number on file: U303933401 (Leslie Controls, Inc. Dba Leslie Controls Inc).
Key specifications for U303933401: First End Bolt Hole Quantity: 8; Flow Control Device: DISK; Second End Relationship with First End: IDENTICAL; Remote Actuation Method: PISTON. 23 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.