PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

19521Stem,fluid Valve

Flowserve Inc · NSN 4820-01-206-4239 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-206-4239 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-206-4239. Primary manufacturer part number: 19521.
Features
  • Stem,fluid Valve — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: Flowserve Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Stem,fluid Valve, cataloged under National Stock Number 4820-01-206-4239, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Flowserve Inc. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameStem,fluid Valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersFlowserve Inc (CAGE 63220)
Technical Specifications
ParameterValue
NSN4820-01-206-4239
Primary Part Number19521
Item NameStem,fluid Valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerFlowserve Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
2810-00-331-6748 INTERCHANGEABLE
Lifter,valve
5950-00-646-292819521 INTERCHANGEABLE
Reactor
Freed Transformer Co
5110-00-764-4801 INTERCHANGEABLE
Pliers,diagonal Cutting
5820-00-918-4351 INTERCHANGEABLE
Ferrule
6930-01-080-73741952-1 INTERCHANGEABLE
Coupler,mode Select
Malwin Electronics Corp.
6230-01-617-568719521 INTERCHANGEABLE
Flashlight
Uke Corporation Dba Uke Corp Div Mustafa T Uke & Alan K Uke Partners
Cross-Reference Index
Part NumberManufacturer
19521 PRIMARY Flowserve Inc (USA)
F-35071 PART 19 Flowserve Inc (USA)
Related Parts
2810-00-331-6748INTERCHANGEABLE
LIFTER,VALVE
5950-00-646-2928INTERCHANGEABLE
REACTOR
19521
5110-00-764-4801INTERCHANGEABLE
PLIERS,DIAGONAL CUTTING
5820-00-918-4351INTERCHANGEABLE
FERRULE
6930-01-080-7374INTERCHANGEABLE
COUPLER,MODE SELECT
1952-1
6230-01-617-5687INTERCHANGEABLE
FLASHLIGHT
19521

Frequently Asked Questions

What is NSN 4820-01-206-4239?

NSN 4820-01-206-4239 is a Stem,fluid Valve, manufactured by Flowserve Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-206-4239?

NSN 4820-01-206-4239 has 2 cross-referenced part numbers: 19521 (Flowserve Inc), F-35071 PART 19 (Flowserve Inc).

What NSN replaces 4820-01-206-4239?

There are 6 known substitutes for 4820-01-206-4239: 2810-00-331-6748, 5950-00-646-2928, 5110-00-764-4801 and 3 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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