The Valve,expansion, cataloged under National Stock Number 4820-01-172-6660, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-172-6660 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK, CIRCULAR |
| First End Thread Series Designator | UNF |
| Second End Seat Angle in Deg | 45.0 |
| First End Thread Direction | RIGHT-HAND |
| Second End Nominal Thread Size | 0.750 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 3A A |
| Body Style | STRAIGHT THRU |
| First End Seat Angle in Deg | 45.0 |
| First End Thread Class | 3A A |
| First End Style Designator | FLARED |
| Bulb Length | 3.000 INCHES NOMINAL IN |
| Bulb Diameter | 0.500 INCHES NOMINAL IN |
| Second End Thread Series Designator | UNF |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Second End Style Designator | FLARED |
| First End Connection Type | THREADED EXTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.438 INCHES NOMINAL IN |
| Material | COPPER ALLOY BODY |
| Valve Expansion Control Type | THERMOSTATIC |
| Media for Which Designed | REFRIGERANT |
| Second End Connection Type | THREADED EXTERNAL TUBE |
| First End Nominal Thread Size | 0.438 INCHES IN |
| Second End Outside Diameter Tube Accommodated | 0.750 INCHES NOMINAL IN |
| 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 |
|---|---|
| GBB-00301-G | 3/9 Design control — primary reference Uniflow Manufacturing Company Dba Kold-Draft |
NSN 4820-01-172-6660 is a Valve,expansion, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-172-6660: Flow Control Device: DISK, CIRCULAR; First End Thread Series Designator: UNF; Second End Seat Angle in Deg: 45.0; First End Thread Direction: RIGHT-HAND. 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.