Disk, Valve4820-01-234-4994

NSN 4820-01-234-4994 · NIIN 012344994 · Part number 20571-F PART 4

Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 04537

Government record, cited

NSN 4820-01-234-4994 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-234-4994. Manufacturer of record part number: 20571-F PART 4.

Also searched as 4820-01-234-4994 · 4820012344994 · NIIN 012344994 · 01-234-4994 · FSC 4820 Valves, Nonpowered · CAGE 04537 · 20571-F PART 4 · 20571-F

Nearby stock numbers ← 4820-01-234-4993 · 4820-01-234-4995 →

4820-01-234-4994 — Valves, Nonpowered

Features

Disk,valve — FSC 4820
Shoulder Width: 1.608 INCHES NOMINAL IN
Shoulder Height: 0.625 INCHES NOMINAL IN
Outside Diameter: 4.140 INCHES NOMINAL IN
Material: STEEL
1 manufacturer part number on file
Manufacturer of record: Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa

Identification

NSN: 4820-01-234-4994
NIIN: 012344994
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 20571-F PART 4
Manufacturer: Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa

General Description

The Disk,valve, cataloged under National Stock Number 4820-01-234-4994, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-234-4994
Primary Part Number	20571-F PART 4
Item Name	Disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Status	ACTIVE
Shoulder Width	1.608 INCHES NOMINAL IN
Shoulder Height	0.625 INCHES NOMINAL IN
Outside Diameter	4.140 INCHES NOMINAL IN
Material	STEEL

Lifecycle & Compliance

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

Cross-Reference Index

Part Number	Manufacturer
20571-F PART 4 PRIMARY	Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA)

Reference documents

Reference	Meaning
20571-F	D/9 Drawing number reference only Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa

Frequently Asked Questions

What is NSN 4820-01-234-4994?

NSN 4820-01-234-4994 is a Disk,valve, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-234-4994?

NSN 4820-01-234-4994 has 1 manufacturer part number on file: 20571-F PART 4 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).

What are the specifications of 20571-F PART 4?

Key specifications for 20571-F PART 4: Overall Height: 6.500 INCHES NOMINAL IN; Shoulder Width: 1.608 INCHES NOMINAL IN; Shoulder Height: 0.625 INCHES NOMINAL IN; Outside Diameter: 4.140 INCHES NOMINAL IN. 4 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-234-4994 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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