The Valve,check, cataloged under National Stock Number 4820-01-441-7691, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-441-7691 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 3.880 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM A105NLC ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A182, F6A ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM A182, F6A/STELLITE ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Bolt Hole Nominal Diameter | 0.620 INCHES ALL ENDS IN |
| Valve Size | 1.500 INCHES IN |
| Nominal Outside Diameter | 5.000 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 ALL ENDS |
| Face to Face Distance | 6.500 INCHES IN |
| Material | STEEL UNS K03504 BODY |
| Material | STEEL UNS K91151 FLOW CONTROL DEVICE |
| Material | STEEL UNS K91151 SEAT |
| Raised Face Nominal Diameter | 2.880 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 0.690 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 |
| Reference | Meaning |
|---|---|
| 22449A | D/9 Drawing number reference only Zidell Valve Corp |
| FIG.1331-A8-18- | C/1 Advisory reference — outside the item-of-supply concept Zidell Valve Corp |
| FIG 1331 A8-18 1 1/2IN | 3/9 Design control — primary reference Zidell Valve Corp |
NSN 4820-01-441-7691 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-441-7691: Flow Control Device: PISTON; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 3.880 INCHES ALL ENDS IN. 23 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.