The Valve,diaphragm,stop, cataloged under National Stock Number 4820-01-287-0418, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tri-State Technical Sales Corp. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-287-0418 |
| Primary Part Number | 506-6-N1/1552 1IN |
| Item Name | Valve,diaphragm,stop |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tri-State Technical Sales Corp |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 3.125 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.625 INCHES ALL ENDS IN |
| Valve Size | 1.000 INCHES IN |
| Nominal Outside Diameter | 4.250 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| Face to Face Distance | 4.875 INCHES IN |
| Material | RUBBER CHLOROPRENE CLASS CR FLOW CONTROL DEVICE |
| Material | IRON ALLOY BODY |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 506-6-N1/1552 1IN PRIMARY | Tri-State Technical Sales Corp (USA) |
| CSVA5-12 1IN | Triumph Tooling and Mfg Co Inc (USA) |
| Reference | Meaning |
|---|---|
| CSVA5-12 | D/9 Drawing number reference only Rockwell Intl Corp Flow Control Div |
| 11-51-004-1IN | 5/9 Secondary reference Rockwell Intl Corp Flow Control Div |
| 506-1-N1/1552 1IN | 5/9 Secondary reference Tri-State Technical Sales Corp |
NSN 4820-01-287-0418 is a Valve,diaphragm,stop, manufactured by Tri-State Technical Sales Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-287-0418 has 2 manufacturer part numbers on file: 506-6-N1/1552 1IN (Tri-State Technical Sales Corp), CSVA5-12 1IN (Triumph Tooling and Mfg Co Inc).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-288-6661, 4820-01-288-6662, 4820-01-325-9015. Verify interchangeability with system specifications before substitution.
Key specifications for 506-6-N1/1552 1IN: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 3.125 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 13 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.