The Seat,valve, cataloged under National Stock Number 4820-01-134-7812, 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 3 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-134-7812 |
| Primary Part Number | HL-18112PC88 |
| Item Name | Seat,valve |
| 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 |
| Body Outside Diameter | 3.480 INCHES NOMINAL IN |
| Body Inside Diameter | 2.750 INCHES NOMINAL IN |
| Material | COPPER OVERALL |
| 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 |
|---|---|
| HL-18112PC88 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| HL-18112PC88 | 5/9 Secondary reference U.S. Government activity |
| HL18122PC88 | 5/9 Secondary reference U.S. Government activity |
| HL-18112PC88 | 5/9 Secondary reference U.S. Government activity |
| HL-18112PC88 | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
| HL-18112 | D/9 Drawing number reference only U.S. Government activity |
| 1925N | 5/9 Secondary reference U.S. Government activity |
| HL-18112PC88 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
NSN 4820-01-134-7812 is a Seat,valve, 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 4820-01-134-7812 has 1 manufacturer part number on file: HL-18112PC88 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
3 possible matches (shared part number, not a government interchangeability claim): 4310-01-134-7813, 4820-01-134-7814, 4310-01-134-7815. Verify interchangeability with system specifications before substitution.
Key specifications for HL-18112PC88: Overall Height: 0.562 INCHES NOMINAL IN; Body Outside Diameter: 3.480 INCHES NOMINAL IN; Body Inside Diameter: 2.750 INCHES NOMINAL IN; End Item Identification: COMPRESSOR,MODEL NO.7/7/5-3/4X5-6CYL. 3 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.