The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-115-9793, 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 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-115-9793 |
| Primary Part Number | U537549 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Triumph Thermal Systems, Llc |
| Status | ACTIVE |
| Flow Control Device | PISTON, SPRING LOADED |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | -65.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF |
| Body Style | SINGLE CONNECTION STRAIGHT THRU |
| First End Seat Angle in Deg | 45.0 |
| First End Thread Class | 3A A |
| First End Style Designator | FLARED |
| End Connection Quantity | 1 |
| Opening Pressure Setting | ERR-060 |
| Temp Control Device Type | THERMOSTATIC |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Temp Adjustability | ADJUSTABLE |
| Surface Treatment | NICKEL OUTSIDE |
| First End Outside Diameter Tube Accommodated | 0.750 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-115-9793 is a Valve,relief,pressure and Temper, manufactured by Triumph Thermal Systems, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-115-9793 has 2 manufacturer part numbers on file: VD210340N (Vernatherm Llc), U537549 (Triumph Thermal Systems, Llc).
Key specifications for U537549: Flow Control Device: PISTON, SPRING LOADED; First End Thread Direction: RIGHT-HAND; Temp Rating: -65.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF; Body Style: SINGLE CONNECTION STRAIGHT THRU. 15 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.
NSN 4820-01-115-9793 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.