The Seat,valve, cataloged under National Stock Number 4820-00-019-0636, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tyco Fire Products Lp. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-019-0636 |
| Primary Part Number | 20-07844 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tyco Fire Products Lp |
| Status | ACTIVE |
| Body Outside Diameter | 5.617 INCHES MINIMUM AND 5.622 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 4.500 INCHES NOMINAL IN |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Seat Angle in Deg | 0.667 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 |
NSN 4820-00-019-0636 is a Seat,valve, manufactured by Tyco Fire Products Lp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-019-0636 has 2 manufacturer part numbers on file: 20-07844 (Tyco Fire Products Lp), V7844 (Portland Valve Llc).
1 possible match (shared part number, not a government interchangeability claim): 5985-01-500-6522. Verify interchangeability with system specifications before substitution.
Key specifications for 20-07844: Overall Height: 1.062 INCHES NOMINAL IN; Body Outside Diameter: 5.617 INCHES MINIMUM AND 5.622 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 4.500 INCHES NOMINAL IN. 6 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.