The Valve,check, cataloged under National Stock Number 4820-01-018-1718, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 26 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-018-1718 |
| Primary Part Number | 3P4218 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | OVAL WITH HOLES SECOND END |
| Flange Shape | RECTANGULAR FIRST END |
| Flange Face Design | PLAIN FIRST END |
| Flange Face Design | PLAIN SECOND END |
| Nominal Length | 2.906 INCHES SECOND END IN |
| Nominal Length | 2.937 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 2.125 INCHES SECOND END IN |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | FLANGE SECOND END |
| Connection Type | FLANGE FIRST END |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.312 INCHES ALL ENDS IN |
| Valve Size | 2.750 INCHES IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 1.875 INCHES FIRST END IN |
| Second Connection Face to Centerline Distance | 0.937 INCHES IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 FIRST END |
| Nominal Width | 2.750 INCHES FIRST END IN |
| Nominal Width | 1.781 INCHES SECOND END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Length | 2.000 INCHES FIRST END IN |
| First Connection Face to Centerline Distance | 1.500 INCHES IN |
| Material | STEEL OVERALL |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 2.000 INCHES FIRST END IN |
| Nominal Thickness | 0.875 INCHES SECOND END 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 |
|---|---|
| 3P4218 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 4820-01-018-1718 is a Valve,check, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-018-1718 has 1 manufacturer part number on file: 3P4218 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 3P4218: Flow Control Device: DISK; Flange Shape: OVAL WITH HOLES SECOND END; Flange Shape: RECTANGULAR FIRST END; Flange Face Design: PLAIN FIRST END. 26 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.