Valve, Check4820-01-641-6221

NSN 4820-01-641-6221 · NIIN 016416221 · Part number D-1733

Hydro Mechanical Systems Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 0L817

Government record, cited

NSN 4820-01-641-6221 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-641-6221. Manufacturer of record part number: D-1733.

Also searched as 4820-01-641-6221 · 4820016416221 · NIIN 016416221 · 01-641-6221 · FSC 4820 Valves, Nonpowered · CAGE 0L817 · D-1733

Nearby stock numbers ← 4820-01-641-6215 Seat, Valve · 4820-01-641-6252 Valve, Butterfly →

4820-01-641-6221 — Valves, Nonpowered

Features

Valve,check — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Hydro Mechanical Systems Inc

Identification

NSN: 4820-01-641-6221
NIIN: 016416221
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: D-1733
Manufacturer: Hydro Mechanical Systems Inc

General Description

The Valve,check, cataloged under National Stock Number 4820-01-641-6221, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydro Mechanical Systems Inc. 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,check
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	Hydro Mechanical Systems Inc (CAGE 0L817)

Technical Specifications

Parameter	Value
NSN	4820-01-641-6221
Primary Part Number	D-1733
Item Name	Valve,check
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Hydro Mechanical Systems Inc
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
D-1733 PRIMARY	Hydro Mechanical Systems Inc (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 4820-01-641-6221?

NSN 4820-01-641-6221 is a Valve,check, manufactured by Hydro Mechanical Systems Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-641-6221?

NSN 4820-01-641-6221 has 1 manufacturer part number on file: D-1733 (Hydro Mechanical Systems Inc).

Is NSN 4820-01-641-6221 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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