The Valve,check, cataloged under National Stock Number 4820-01-138-6719, 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 12 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 | 4820-01-138-6719 |
| Primary Part Number | CG811312 4IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William E Williams Valve Corp |
| Status | ACTIVE |
| Material Document and Classification | STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | STM A216,GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 500.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Material | STEEL UNS J03002 BODY |
| Material | STEEL CORROSION RESISTING STEM |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| CG811312 4IN PRIMARY | William E Williams Valve Corp (USA) |
NSN 4820-01-138-6719 is a Valve,check, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-138-6719 has 1 manufacturer part number on file: CG811312 4IN (William E Williams Valve Corp).
Key specifications for CG811312 4IN: Material Document and Classification: STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE; Material Document and Classification: STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Material Document and Classification: STM A182,GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE STEM; Material Document and Classification: STM A216,GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE BODY. 12 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.