The Seat,valve, cataloged under National Stock Number 4820-01-506-0437, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-506-0437 |
| Primary Part Number | 75430701-013S |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Body Outside Diameter | 4.885 INCHES MINIMUM AND 4.895 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Material Document and Classification | ASTM A182 TY F316 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 4.000 INCHES MINIMUM AND 4.020 INCHES MAXIMUM IN |
| Seat Radius | 2.000 INCHES NOMINAL IN |
| Material | STEEL COMP 316 SEAT |
| Seat Angle in Deg | 30.000 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 |
|---|---|
| 7492-712 ITEM 6 4IN | Velan Valve Corp. (USA) |
| 75430701-013S PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 7543-701-440 | 5/1 Secondary reference Velan Valve Corp. |
| 7492-712 | D/9 Drawing number reference only Velan Valve Corp. |
| 7543-701-013S | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
NSN 4820-01-506-0437 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-506-0437 has 2 manufacturer part numbers on file: 7492-712 ITEM 6 4IN (Velan Valve Corp.), 75430701-013S (Velan Valve Corp.).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-524-6091, 4820-01-581-0926. Verify interchangeability with system specifications before substitution.
Key specifications for 75430701-013S: Overall Height: 0.750 INCHES NOMINAL IN; Body Outside Diameter: 4.885 INCHES MINIMUM AND 4.895 INCHES MAXIMUM IN; Style Designator: PLAIN; Material Document and Classification: ASTM A182 TY F316 ASSN STD SINGLE MATERIAL RESPONSE SEAT. 8 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.