The Valve,check, cataloged under National Stock Number 4820-01-435-4856, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corp Div Instrumentation Products Division. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-435-4856 |
| Primary Part Number | 4M4AC4L1EPRSS |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corp Div Instrumentation Products Division |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Connection Style | PLAIN (PIPE) FIRST END |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Material | STEEL COMP 316 BODY |
| Material | STEEL COMP 316 FLOW CONTROL DEVICE |
| Material | RUBBER ISOBUTYLENE-ISOPRENE CLASS IIR SEAT |
| Thread Series Designator | NPT FIRST END |
| 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 |
|---|---|
| 4M4AC4L1EPRSS PRIMARY | Parker-Hannifin Corp Div Instrumentation Products Division (USA) |
NSN 4820-01-435-4856 is a Valve,check, manufactured by Parker-Hannifin Corp Div Instrumentation Products Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-435-4856 has 1 manufacturer part number on file: 4M4AC4L1EPRSS (Parker-Hannifin Corp Div Instrumentation Products Division).
Key specifications for 4M4AC4L1EPRSS: Flow Control Device: POPPET; Connection Style: PLAIN (PIPE) FIRST END; Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: THREADED EXTERNAL PIPE FIRST END. 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.