The Seat,valve, cataloged under National Stock Number 4820-00-623-9541, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings). Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-623-9541 |
| Primary Part Number | CS4820-0089 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.562 INCHES NOMINAL IN |
| Flange Diameter | 1.800 INCHES NOMINAL IN |
| Body Outside Diameter | 1.188 INCHES NOMINAL IN |
| Body Stepped Inside Diameter | 0.812 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 1.625 INCHES MINIMUM AND 1.626 INCHES MAXIMUM FIRST STEP IN |
| Style Designator | PLAIN FLANGED |
| Under Flange Height | 0.438 INCHES NOMINAL IN |
| Material | COBALT ALLOY FACE |
| Material | STEEL CORROSION RESISTING BODY |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| CS4820-0089 PRIMARY | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) (USA) |
| 311420058 | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| 31142 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| 12429NPC19 | 5/9 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
NSN 4820-00-623-9541 is a Seat,valve, manufactured by Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings), classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-623-9541 has 2 manufacturer part numbers on file: CS4820-0089 (Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)), 311420058 (Leslie Controls, Inc. Dba Leslie Controls Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5935-00-980-3926, 6640-01-248-9080, 5330-01-576-4913. Verify interchangeability with system specifications before substitution.
Key specifications for CS4820-0089: Flange Seat to Disk End Height: 0.562 INCHES NOMINAL IN; Flange Diameter: 1.800 INCHES NOMINAL IN; Body Outside Diameter: 1.188 INCHES NOMINAL IN; Body Stepped Inside Diameter: 0.812 INCHES NOMINAL SECOND STEP IN. 11 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.