The Valve,safety Relief, cataloged under National Stock Number 4820-00-288-6939, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Westinghouse Electric Corp. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-288-6939 |
| Primary Part Number | 2801FPC1T018 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Westinghouse Electric Corp |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Face Design | PLAIN FIRST END |
| Bolt Circle Nominal Diameter | 8.875 INCHES FIRST END IN |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.688 INCHES FIRST END IN |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +4.5 TO 5.5 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 425.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nominal Outside Diameter | 10.125 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 12 FIRST END |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| 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 |
|---|---|
| 2801FPC1T018 PRIMARY | Westinghouse Electric Corp (USA) |
| 54604S5001-83769H45ATN65011 PRIMARY | Naval Sea Systems Command (USA) |
| CA148S6100-537815PC434 PRIMARY | Naval Sea Systems Command (USA) |
| 40J559PC434 PRIMARY | Westinghouse Electric Corp (USA) |
| Reference | Meaning |
|---|---|
| 54604S5001-83769H45ATN65011 | 5/9 Secondary reference U.S. Government activity |
| 40J559PC434 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
| CA148S6100-537815PC434 | 5/9 Secondary reference U.S. Government activity |
| 2801FPC1T018 | 5/9 Secondary reference Westinghouse Electric Corp Control Business Unit |
NSN 4820-00-288-6939 is a Valve,safety Relief, manufactured by Westinghouse Electric Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-288-6939 has 4 manufacturer part numbers on file: 2801FPC1T018 (Westinghouse Electric Corp), 54604S5001-83769H45ATN65011 (Naval Sea Systems Command), CA148S6100-537815PC434 (Naval Sea Systems Command), 40J559PC434 (Westinghouse Electric Corp).
Key specifications for 2801FPC1T018: Flange Shape: ROUND WITH HOLES FIRST END; Flange Face Design: PLAIN FIRST END; Bolt Circle Nominal Diameter: 8.875 INCHES FIRST END IN; Connection Type: FLANGE FIRST END. 17 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.