The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-157-8129, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-00-157-8129 |
| Primary Part Number | 325700PC4 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | STRAIGHT THRU |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Style Designator | PLAIN |
| Second End Bolt Hole Quantity | 2 |
| End Connection Quantity | 2 |
| Second End Flange Thickness | 0.187 INCHES NOMINAL IN |
| Valve Loading Method | SPRING |
| Second End Style Designator | PLAIN |
| Second End Flange Shape Style | OVAL W/ BOLT HOLES |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.187 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY BODY |
| Media for Which Designed | AIR |
| Second End Connection Type | PLAIN FACE FLANGE |
| Filter | NOT INCLUDED |
| Second End Bolt Hole Diameter | 0.140 INCHES NOMINAL IN |
| 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 |
|---|---|
| 325700PC4 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 591411-1 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 818194REVD PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 325700PC4 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 591411PC1 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 3257000 | D/9 Drawing number reference only Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 4820-00-157-8129 is a Valve,regulating,fluid Pressure, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-157-8129 has 5 manufacturer part numbers on file: 325700PC4 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 591411-1 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 818194REVD (Lockheed Martin Corporation Div Rms - Mitchel Field), 325700PC4 (Lockheed Martin Corporation Div Rms - Mitchel Field), 591411PC1 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 325700PC4: Flow Control Device: DISK; Second End Relationship with First End: NOT IDENTICAL; Body Style: STRAIGHT THRU; Regulation Type: AUTOMATIC SINGLE STAGE. 18 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.