Valve, Safety Relief4820-01-644-0836

NSN 4820-01-644-0836 · NIIN 016440836 · Part number 1020838C

Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 61208

Government record, cited

NSN 4820-01-644-0836 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-644-0836. Manufacturer of record part number: 1020838C.

Also searched as 4820-01-644-0836 · 4820016440836 · NIIN 016440836 · 01-644-0836 · FSC 4820 Valves, Nonpowered · CAGE 61208 · 1020838C

Nearby stock numbers ← 4820-01-644-0801 Valve, Globe · 4820-01-644-0841 Valve Assembly →

4820-01-644-0836 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic

Identification

NSN: 4820-01-644-0836
NIIN: 016440836
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 1020838C
Manufacturer: Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-644-0836, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Catalog Facts

Item Name	Valve,safety Relief
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (CAGE 61208)

Technical Specifications

Parameter	Value
NSN	4820-01-644-0836
Primary Part Number	1020838C
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
Status	ACTIVE

Lifecycle & Compliance

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

Cross-Reference Index

Part Number	Manufacturer
1020838C PRIMARY	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-644-0836?

NSN 4820-01-644-0836 is a Valve,safety Relief, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-644-0836?

NSN 4820-01-644-0836 has 1 manufacturer part number on file: 1020838C (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).

Is NSN 4820-01-644-0836 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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