The Valve,regulating,temperature, cataloged under National Stock Number 4820-01-499-2508, 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 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-499-2508 |
| Primary Part Number | 40735-401 |
| Item Name | Valve,regulating,temperature |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| Status | ACTIVE |
| Flow Control Device | PLUNGER AND DISK, DUAL |
| Two-Way Valve Action | REVERSE ACTING |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 6.000 INCHES NOMINAL IN |
| First End Style Designator | SOCKET W/BRAZING RING |
| Bulb Diameter | 1.875 INCHES NOMINAL IN |
| Temp Rating | 60.0 FAHRENHEIT MINIMUM AND 160.0 FAHRENHEIT MAXIMUM DEGF |
| Material Document and Classification | ASTM B61 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-S-763, CLASS 302, 303, 304, 305, 310, OR 316 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | ASTM B61 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | QQ-S-763, CLASS 302, 303, 304, 305, 310, OR 316 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| End Connection Quantity | 2 |
| Capillary Tube Length | 12.000 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | PE II, CLASS 2 TYPE |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| Temp Adjustability | ADJUSTABLE |
| Thermostatic Element | LIQUID IMMERSION TYPE |
| First End Outside Diameter Tube Accommodated | 0.500 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | COPPER ALLOY 922 BODY |
| Material | STEEL CORROSION RESISTING STEM |
| Material | COPPER ALLOY 922 SEAT |
| Material | PLASTIC POLYPROPYLENE PACKING |
| Furnished Items | TAILPIECE W/GROOVES AND UNION NUT |
| 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 |
|---|---|
| 40735-4 ASSY 40735-401 | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| 40735-401 PRIMARY | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| Reference | Meaning |
|---|---|
| MIL-DTL-19772 | 4/1 Identification reference U.S. Government activity |
| MIL-V-19772 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-499-2508 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 4820-01-499-2508 has 2 manufacturer part numbers on file: 40735-4 ASSY 40735-401 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40735-401 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
Key specifications for 40735-401: Flow Control Device: PLUNGER AND DISK, DUAL; Two-Way Valve Action: REVERSE ACTING; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU. 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.