The Valve,regulating,temperature, cataloged under National Stock Number 4820-00-276-8978, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-276-8978 |
| Item Name | Valve,regulating,temperature |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Two-Way Valve Action | DIRECT ACTING |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| First End Style Designator | SOCKET W/BRAZING RING |
| Bulb Length | 5.438 INCHES NOMINAL IN |
| Bulb Diameter | 0.750 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| Capillary Tube Length | 120.000 INCHES NOMINAL IN |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| Temp Adjustability | NOT ADJUSTABLE |
| Thermostatic Element | DUCT TYPE |
| First End Outside Diameter Tube Accommodated | 0.840 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Material | STEEL CORROSION RESISTING BULB |
| Furnished Items | BRAZING RING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| E3-TYPE W-1/2 SIZE | 5/1 Secondary reference Schneider Electric Systems Usa Inc |
| HC47310W | 5/9 Secondary reference Spirax Sarco Inc Dba Spirax Sarco |
| MIL-V-3155C | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-3155 | 4/1 Identification reference U.S. Government activity |
| 80521-1/2IN. E-W | 5/9 Secondary reference Spirax Sarco Inc Dba Spirax Sarco |
NSN 4820-00-276-8978 is a Valve,regulating,temperature, classified under FSC 4820, Valves, Nonpowered. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 4820-00-276-8979, 4820-00-276-8981, 4820-00-276-8985. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-276-8978: Two-Way Valve Action: DIRECT ACTING; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU; First End Style Designator: SOCKET W/BRAZING RING. 17 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.