The Valve,diaphragm,stop, cataloged under National Stock Number 4820-01-284-4876, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-284-4876 |
| Item Name | Valve,diaphragm,stop |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 5.000 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.688 INCHES ALL ENDS IN |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.500 INCHES IN |
| Nominal Outside Diameter | 6.125 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 6 ALL ENDS |
| Media for Which Designed | WATER, SALT SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY SEAT |
| Material | RUBBER ETHYLENE-PROPYLENE CLASS EPM FLOW CONTROL DEVICE |
| Nominal Thickness | 0.938 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 |
|---|---|
| 1657601K AND CD00021 | 5/2 Secondary reference U.S. Government activity |
| 1657601K | 3/2 Design control — primary reference U.S. Government activity |
| 181M-EPMS 2-1/2IN AND 16576 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-284-4876 is a Valve,diaphragm,stop, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-284-4876: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 5.000 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 16 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.