The Valve,radiator,heating, cataloged under National Stock Number 4520-00-540-4205, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-540-4205 |
| Item Name | Valve,radiator,heating |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Flow Control Device | DISK, TOP GUIDED |
| First End Thread Direction | RIGHT-HAND |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | PLAIN |
| Second End Nominal Pipe Size Accommodated | 1.000 INCHES IN |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Operating Pressure | 25.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Style Designator | PLAIN |
| Nondefinitive Spec/std Data | 2 TYPE AND C STYLE AND 25 CLASS AND 1 IN. SIZE AND 2 PATTERN AND 1 SERVICE IN |
| First End Connection Type | THREADED INTERNAL PIPE |
| Media for Which Designed | STEAM |
| First End Nominal Pipe Size Accommodated | 1.000 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY STEM |
| Material | COPPER ALLOY SEAT |
| Second End Connection Type | THREADED EXTERNAL PIPE |
| Valve Operation Method | WHEEL |
| 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 |
|---|---|
| A-A-50458-1-GLOBE | 2/1 Government specification standardization Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| A-A-50458 | 4/1 Identification reference Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
NSN 4520-00-540-4205 is a Valve,radiator,heating, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4520-00-540-4207. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-00-540-4205: Flow Control Device: DISK, TOP GUIDED; First End Thread Direction: RIGHT-HAND; Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS; First End Style Designator: PLAIN. 19 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.