The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-021-5577, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Triumph Thermal Systems, Llc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-021-5577 |
| Primary Part Number | U513150-51 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| Second End Relationship with First End | IDENTICAL |
| First End Thread Class | 3B |
| Third End Relationship with Preceding Ends | NOT IDENTICAL WITH FIRST OR SECOND END |
| First End Style Designator | GASKET SEAL |
| Temp Rating | -65.0 FAHRENHEIT MINIMUM AND 275.0 FAHRENHEIT MAXIMUM DEGF |
| End Connection Quantity | 3 |
| Valve Loading Method | SPRING |
| Third End Thread Direction | RIGHT-HAND |
| Third End Thread Class | 3B |
| Media for Which Designed | AIR |
| Third End Style Designator | GASKET SEAL |
| Thread Size and Series/type Designator | 9/16-18 UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Thread Size and Series/type Designator | 7/16-20 UNIFIED NATIONAL JOINT FINE (UNJF) THIRD END |
| 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 | N |
| Part Number | Manufacturer |
|---|---|
| U513150-51 PRIMARY | Triumph Thermal Systems, Llc (USA) |
| U513150-51 | Integrated Procurement Technologies (USA) |
| 128SCH106-1 PRIMARY | Integrated Procurement Technologies (USA) |
| Reference | Meaning |
|---|---|
| 128SCH106-3 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| 128SCH106-3 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 4820-00-021-5577 is a Valve,regulating,fluid Pressure, manufactured by Triumph Thermal Systems, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-021-5577 has 3 manufacturer part numbers on file: U513150-51 (Triumph Thermal Systems, Llc), U513150-51 (Integrated Procurement Technologies), 128SCH106-1 (Integrated Procurement Technologies).
Key specifications for U513150-51: Second End Relationship with First End: IDENTICAL; First End Thread Class: 3B; Third End Relationship with Preceding Ends: NOT IDENTICAL WITH FIRST OR SECOND END; First End Style Designator: GASKET SEAL. 14 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.