The Valve,check, cataloged under National Stock Number 4820-01-138-5333, 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 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-138-5333 |
| Primary Part Number | CG81157 1 1-2IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William E Williams Valve Corp |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Connection Style | BEVELED (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM A182 GRADE F6 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM A182 GRADE F316L ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A217 GRADE CA15 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material | STEEL UNS J91150 FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING SEAT |
| Material | STEEL COMP 316L 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 |
|---|---|
| CG81157 1 1-2IN PRIMARY | William E Williams Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| CG81157 | D/9 Drawing number reference only William E Williams Valve Corp |
NSN 4820-01-138-5333 is a Valve,check, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-138-5333 has 1 manufacturer part number on file: CG81157 1 1-2IN (William E Williams Valve Corp).
Key specifications for CG81157 1 1-2IN: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Connection Style: BEVELED (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 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.