The Valve,pressure Release, cataloged under National Stock Number 4820-00-735-9176, 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 1 specification, 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-735-9176 |
| Primary Part Number | UL689 |
| Item Name | Valve,pressure Release |
| 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 |
| General Characteristics Item Description | STEEL O/A;MECHANICALLY OPERATED;1 PIPE CONNECTION 0.125-27 NPT THD SIZE;THD MTD 1.500-12 UNF THD SIZE;1.500 IN. HEX SHAPE;6.000 IN. O/A LG 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 |
|---|---|
| UL689 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| HL17835PC88 | 5/9 Secondary reference U.S. Government activity |
| UL689 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| UL689 | 3/9 Design control — primary reference U.S. Government activity |
| 1772N | 5/9 Secondary reference U.S. Government activity |
| UL689 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
NSN 4820-00-735-9176 is a Valve,pressure Release, 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 4820-00-735-9176 has 1 manufacturer part number on file: UL689 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for UL689: General Characteristics Item Description: STEEL O/A;MECHANICALLY OPERATED;1 PIPE CONNECTION 0.125-27 NPT THD SIZE;THD MTD 1.500-12 UNF THD SIZE;1.500 IN. HEX SHAPE;6.000 IN. O/A LG IN. 1 specification is 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.