The Valve,check, cataloged under National Stock Number 4820-01-175-1076, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William E Williams Valve Corp. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-175-1076 |
| Primary Part Number | CG82138 2IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William E Williams 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 | 4.750 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Supplementary Features | THIS ITEM HAS BEEN REVIEWED FOR ASBESTOS MATERIAL. THE CURRENT APPROVED SOURCES 79342 HAVE INDICATED THIER PART NUMBER CONTAINED ASBESTOS PRIOR TO 1984. THEY CONTINUE TO MANUFACTURE THE SAME PART NUMBER WITHOUT ASBESTOS MATERIAL AFTER 1984 |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM A182 GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM A351 GRADE CF3M ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A217 GRADE CA15 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.000 INCHES IN |
| Nominal Outside Diameter | 6.000 INCHES ALL ENDS IN |
| Disk Loading Method | WEIGHT |
| Bolt Hole Quantity | 8 ALL ENDS |
| Face to Face Distance | 8.000 INCHES IN |
| Material | STEEL UNS J91150 FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Material | STEEL UNS J92800 BODY |
| Raised Face Nominal Diameter | 3.625 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 0.562 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 |
|---|---|
| CG82138 2IN PRIMARY | William E Williams Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| CG82138 | D/9 Drawing number reference only William E Williams Valve Corp |
NSN 4820-01-175-1076 is a Valve,check, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-175-1076 has 1 manufacturer part number on file: CG82138 2IN (William E Williams Valve Corp).
Key specifications for CG82138 2IN: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 4.750 INCHES ALL ENDS IN. 25 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.