The Valve,check, cataloged under National Stock Number 4820-01-443-7660, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Westwater Supply Corp. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-443-7660 |
| Primary Part Number | B-310B 1-1/2IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Westwater Supply Corp |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 1.500 INCHES ALL ENDS IN |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | COPPER ALLOY 836 BODY |
| Material | COPPER ALLOY 836 FLOW CONTROL DEVICE |
| 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 |
|---|---|
| B-310B 1-1/2IN | Westwater Supply Corp (USA) |
| Reference | Meaning |
|---|---|
| B-310B 1-1/2IN | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-443-7660 is a Valve,check, manufactured by Westwater Supply Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-443-7660 has 1 manufacturer part number on file: B-310B 1-1/2IN (Westwater Supply Corp).
Key specifications for B-310B 1-1/2IN: Flow Control Device: DISK; Connection Style: PLAIN (TUBE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: UNTHREADED INTERNAL TUBE ALL ENDS. 11 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.