The Valve,stop-Check, cataloged under National Stock Number 4820-01-422-7240, 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 21 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-422-7240 |
| Primary Part Number | 33311-30 F04-2084B-02TS |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 3.250 INCHES ALL ENDS IN |
| Mounting Position | VERTICAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Valve Size | 0.750 INCHES IN |
| Bonnet Type | OUTSIDE SCREW-YOKE |
| Nominal Outside Diameter | 4.625 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | BOLTED |
| Face to Face Distance | 7.500 INCHES IN |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL UNS K03504 BODY |
| Material | STEEL CORROSION RESISTING STEM |
| Raised Face Nominal Diameter | 1.875 INCHES ALL ENDS IN |
| Valve Operation Method | MANUAL |
| Raised Face Nominal Height | 0.250 INCHES ALL ENDS IN |
| Nominal Thickness | 0.625 INCHES ALL ENDS 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 |
|---|---|
| 33311-30 F04-2084B-02TS PRIMARY | Velan Valve Corp. (USA) |
| 53387 P.O. ITEM 003 | Velan Valve Corp. (USA) |
| F04-2084B-02TS PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 33311-30 | D/9 Drawing number reference only Velan Valve Corp. |
| 53387 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-422-7240 is a Valve,stop-Check, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-422-7240 has 3 manufacturer part numbers on file: 33311-30 F04-2084B-02TS (Velan Valve Corp.), 53387 P.O. ITEM 003 (Velan Valve Corp.), F04-2084B-02TS (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-429-1312. Verify interchangeability with system specifications before substitution.
Key specifications for 33311-30 F04-2084B-02TS: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 3.250 INCHES ALL ENDS IN. 21 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.