The Valve,safety Relief, cataloged under National Stock Number 4820-00-348-8277, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-348-8277 |
| Primary Part Number | MLH32666G1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND FIRST END |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Connection Type | FLANGE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter | 1.055 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Material | STEEL OVERALL |
| Raised Face Nominal Diameter | 0.927 INCHES FIRST END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.240 INCHES FIRST END IN |
| Nominal Thickness | 0.210 INCHES FIRST END IN |
| 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 |
|---|---|
| MLH32666G1 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| MLH32666G1 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| MLH32666G1 | 5/9 Secondary reference U.S. Government activity |
| MLH32666G1 | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4820-00-348-8277 is a Valve,safety Relief, manufactured by Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-348-8277 has 1 manufacturer part number on file: MLH32666G1 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for MLH32666G1: Flow Control Device: DISK; Flange Shape: ROUND FIRST END; Flange Face Design: RAISED STRAIGHT FIRST END; Connection Type: FLANGE FIRST END. 12 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.