The Valve,check, cataloged under National Stock Number 4820-01-312-5960, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydac Corp. Government technical data includes 19 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 | 4820-01-312-5960 |
| Primary Part Number | RV20-1.0/12 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydac Corp |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | GASKET SEAL (BOSS) ALL ENDS |
| Mounting Position | HORIZONTAL |
| Minimum Operating Temp | -4.0 FAHRENHEIT DEGF |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 1.313 INCHES ALL ENDS IN |
| Maximum Operating Temp | 212.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | HYDRAULIC FLUID, MINERAL BASE SINGLE RESPONSE |
| Media for Which Designed | HYDRAULIC FLUID, PHOSPHATE-ESTER BASE SECOND RESPONSE |
| Thread Class | 2B ALL ENDS |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | STEEL BODY |
| Thread Series Designator | UN ALL ENDS |
| Opening Pressure Setting | 7.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| RV20-1.0/12 PRIMARY | Hydac Corp (USA) |
NSN 4820-01-312-5960 is a Valve,check, manufactured by Hydac Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-312-5960 has 1 manufacturer part number on file: RV20-1.0/12 (Hydac Corp).
Key specifications for RV20-1.0/12: Flow Control Device: POPPET; Connection Style: GASKET SEAL (BOSS) ALL ENDS; Mounting Position: HORIZONTAL; Minimum Operating Temp: -4.0 FAHRENHEIT DEGF. 19 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.