The Valve,regulating,temperature, cataloged under National Stock Number 4820-01-285-2891, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 13 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-285-2891 |
| Primary Part Number | 40146-104 |
| Item Name | Valve,regulating,temperature |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| Status | ACTIVE |
| First End Bolt Hole Quantity | 6 |
| Flow Control Device | BULB OR DOUBLE SEATED |
| Two-Way Valve Action | REVERSE ACTING |
| Second End Relationship with First End | IDENTICAL |
| First End Flange Thickness | 0.500 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 6.125 INCHES NOMINAL IN |
| First End Style Designator | PLAIN |
| First End Bolt Hole Diameter | 0.562 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| First End Connection Type | PLAIN FACE FLANGE |
| Temp Adjustability | ADJUSTABLE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 40146-104 PRIMARY | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
NSN 4820-01-285-2891 is a Valve,regulating,temperature, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-285-2891 has 1 manufacturer part number on file: 40146-104 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
Key specifications for 40146-104: First End Bolt Hole Quantity: 6; Flow Control Device: BULB OR DOUBLE SEATED; Two-Way Valve Action: REVERSE ACTING; Second End Relationship with First End: IDENTICAL. 13 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.