The Valve,directional Control,3 Posi, cataloged under National Stock Number 4820-01-056-9717, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Northfield Foundry and Machine Company. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-056-9717 |
| Primary Part Number | 8171E-1HS28 |
| Item Name | Valve,directional Control,3 Posi |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Northfield Foundry and Machine Company |
| Status | ACTIVE |
| General Characteristics Item Description | 10.000 IN. FROM CENTERLINE TO END OF PIPE; 2.250 IN. FACE TO CENTERLINE DISTANCE; 1.594 IN. REF TYPE 4 FROM CENTERLINE TO BOLT HOLE CENTER; 3.188 IN. REF TYPE 2 DISTANCE FROM BOLT HOLE CENTER TO BOLT HOLE CENTER; 4.500 IN. REF WIDTH; 4 BOLT HOLES; 1/4-20 UNC-2B THREAD SIZE OF BOLT HOLES FOR PANEL MOUNTING REF; 1 IN. IPT TYP 4 PORTS REF; 6,000 PSI WORKING PRESSURE RANGE; 9,000 PSI PROOF PRESSURE RANGE; 15,000 PSI BURST PRESSURE RANGE; MINUS 65 DEGREE F TO 250 DEGREE F TEMPERTURE RANGE (SPECIAL); TO BE USED WITH MIL-L-7808 OIL; VALVE TO BE SUPPLIED WITH VITON SEALS IN |
| 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 |
|---|---|
| 8171E-1HS28 | Northfield Foundry and Machine Company (USA) |
| Reference | Meaning |
|---|---|
| 58251 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-056-9717 is a Valve,directional Control,3 Posi, manufactured by Northfield Foundry and Machine Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-056-9717 has 1 manufacturer part number on file: 8171E-1HS28 (Northfield Foundry and Machine Company).
Key specifications for 8171E-1HS28: General Characteristics Item Description: 10.000 IN. FROM CENTERLINE TO END OF PIPE; 2.250 IN. FACE TO CENTERLINE DISTANCE; 1.594 IN. REF TYPE 4 FROM CENTERLINE TO BOLT HOLE CENTER; 3.188 IN. REF TYPE 2 DISTANCE FROM BOLT HOLE CENTER TO BOLT HOLE CENTER; 4.500 IN. REF WIDTH; 4 BOLT HOLES; 1/4-20 UNC-2B THREAD SIZE OF BOLT HOLES FOR PANEL MOUNTING REF; 1 IN. IPT TYP 4 PORTS REF; 6,000 PSI WORKING PRESSURE RANGE; 9,000 PSI PROOF PRESSURE RANGE; 15,000 PSI BURST PRESSURE RANGE; MINUS 65 DEGREE F TO 250 DEGREE F TEMPERTURE RANGE (SPECIAL); TO BE USED WITH MIL-L-7808 OIL; VALVE TO BE SUPPLIED WITH VITON SEALS IN; End Item Identification: 4920010245099. 1 specification is 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.