PartsTable TECHNICAL DATA SHEET

NSN 4820-01-086-4278Government record, cited

Bypass Valve4820-01-086-4278

NSN 4820-01-086-4278 · NIIN 010864278

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-086-4278 · 4820010864278 · NIIN 010864278 · 01-086-4278 · FSC 4820 Valves, Nonpowered · S1E10067 ITEM 14 · S1E10067 · V3D10105-01

Nearby stock numbers ← 4820-01-086-4150 Stem, Fluid Valve · 4820-01-086-4310 Valve, Regulating, Fluid Pressure →

4820-01-086-4278 — Valves, Nonpowered

Features

Bypass Valve — FSC 4820

Identification

NSN: 4820-01-086-4278
NIIN: 010864278
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Bypass Valve, cataloged under National Stock Number 4820-01-086-4278, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Catalog Facts

Item Name	Bypass Valve
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)

Technical Specifications

Parameter	Value
NSN	4820-01-086-4278
Item Name	Bypass Valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)

⇄ Related Items 4

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

4820-01-086-4474S1E10067 ITEM 8 POSSIBLE MATCH

SEAT,VALVE

Possible match (shared part number)Vacco Industries

4330-01-086-4516S2C10126-3TA POSSIBLE MATCH

COVER,FLUID FILTER

Possible match (shared part number)Vacco Industries

4330-01-086-9938F3D10088-018 POSSIBLE MATCH

FILTER ELEMENT,FLUID

Possible match (shared part number)Vacco Industries

4730-01-182-1776S2B10164-3TA POSSIBLE MATCH

ORIFICE,VALVE

Possible match (shared part number)Vacco Industries

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
S1E10067 ITEM 14	3/2 Design control — primary reference U.S. Government activity
S1E10067	D/9 Drawing number reference only U.S. Government activity
V3D10105-01	3/2 Design control — primary reference U.S. Government activity

Related Parts

4820-01-086-4474POSSIBLE MATCH

SEAT,VALVE

S1E10067 ITEM 8

4330-01-086-4516POSSIBLE MATCH

COVER,FLUID FILTER

S2C10126-3TA

4330-01-086-9938POSSIBLE MATCH

FILTER ELEMENT,FLUID

F3D10088-018

4730-01-182-1776POSSIBLE MATCH

ORIFICE,VALVE

S2B10164-3TA

Frequently Asked Questions

What is NSN 4820-01-086-4278?

NSN 4820-01-086-4278 is a Bypass Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-086-4278?

4 possible matches (shared part number, not a government interchangeability claim): 4820-01-086-4474, 4330-01-086-4516, 4330-01-086-9938. Verify interchangeability with system specifications before substitution.

Is NSN 4820-01-086-4278 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

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.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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