The Valve,check, cataloged under National Stock Number 4820-01-641-6163, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Shipman Ralph Co. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-641-6163 |
| Primary Part Number | SD2-MN.375IN/0061654 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Shipman Ralph Co |
| Status | ACTIVE |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Connection Type | THREADED EXTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 0.375 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.250 INCHES IN |
| Seat Angle | 45.0 DEGREES ALL ENDS |
| Maximum Operating Temp | 110.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Face to Face Distance | 3.0 INCHES IN |
| Material | STEEL COMP 316 OVERALL |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| SD2-MN.375IN/0061654 PRIMARY | Shipman Ralph Co (USA) |
| 0061654 | Watts Regulator Company (USA) |
NSN 4820-01-641-6163 is a Valve,check, manufactured by Shipman Ralph Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-641-6163 has 2 manufacturer part numbers on file: SD2-MN.375IN/0061654 (Shipman Ralph Co), 0061654 (Watts Regulator Company).
Key specifications for SD2-MN.375IN/0061654: Connection Style: FLARED (TUBE) ALL ENDS; Connection Type: THREADED EXTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Operating Pressure: 0.375 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 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.