The Valve,expansion, cataloged under National Stock Number 4820-00-555-1908, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-555-1908 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DIAPHRAGM |
| Valve Equalizer Location | INTERNAL |
| Temp Rating | 275.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" OR "ADQN" IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | SOCKET |
| Material Document and Classification | QQ-B-626, ALLOY 377 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| End Connection Quantity | 2 |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY 377 BODY |
| Material | COPPER ALLOY 511 FLOW CONTROL DEVICE |
| Valve Expansion Control Type | PRESSURE |
| Media for Which Designed | REFRIGERANT 12 AND REFRIGERANT 22 |
| Valve Pressure Limiting Device | NOT INCLUDED |
| 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 |
|---|---|
| 6294S | 3/9 Design control — primary reference Henry Technologies, Inc. |
| SK5104-6294S | 5/9 Secondary reference Henry Technologies, Inc. |
NSN 4820-00-555-1908 is a Valve,expansion, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-555-1908: Flow Control Device: DIAPHRAGM; Valve Equalizer Location: INTERNAL; Temp Rating: 275.0 FAHRENHEIT DEGF; Second End Relationship with First End: IDENTICAL. 15 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.