The Valve,regulating,temperature, cataloged under National Stock Number 4820-01-443-4463, 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 25 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-443-4463 |
| Primary Part Number | 40056-105 |
| 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 | PISTON, SPRING LOADED |
| Two-Way Valve Action | REVERSE ACTING |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 8.750 INCHES NOMINAL IN |
| First End Flange Thickness | 0.938 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 2.875 INCHES NOMINAL IN |
| First End Style Designator | PLAIN |
| Bulb Diameter | 1.125 INCHES NOMINAL IN |
| Temp Rating | 75.0 FAHRENHEIT MINIMUM AND 105.0 FAHRENHEIT MAXIMUM DEGF |
| First End Bolt Hole Diameter | 0.563 INCHES NOMINAL IN |
| First End Bolt Circle Diameter | 5.000 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-764, TYPE 303-CANCELED FED SPEC SINGLE MATERIAL RESPONSE STEM |
| End Connection Quantity | 2 |
| Capillary Tube Length | 120.000 INCHES NOMINAL IN |
| First End Connection Type | PLAIN FACE FLANGE |
| Temp Adjustability | NOT ADJUSTABLE |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Thermostatic Element | LIQUID IMMERSION TYPE |
| Material | COPPER ALLOY BODY |
| Material | STEEL COMP 303 STEM |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY SEAT |
| Material | PLASTIC TETRAFLUOROETHYLENE PACKING |
| 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 |
|---|---|
| 40056-105 PRIMARY | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 40056-105 CDS-40703 IT 2 | 5/9 Secondary reference Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| 40056-1 | D/9 Drawing number reference only Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
NSN 4820-01-443-4463 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 4820-01-443-4463 has 1 manufacturer part number on file: 40056-105 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-445-3141. Verify interchangeability with system specifications before substitution.
Key specifications for 40056-105: First End Bolt Hole Quantity: 6; Flow Control Device: PISTON, SPRING LOADED; Two-Way Valve Action: REVERSE ACTING; Second End Relationship with First End: IDENTICAL. 25 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.