PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20339Seat,valve

Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val · NSN 4820-01-420-1878 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-420-1878 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-420-1878. Primary manufacturer part number: 20339.
Features
  • Seat,valve — FSC 4820
  • 1 verified cross-reference
  • Primary manufacturer: Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-420-1878, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-420-1878
Primary Part Number20339
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTriumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
2530-01-146-4607 INTERCHANGEABLE
Brake Shoe Set
4820-01-186-93752033914AS51SS INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
5950-01-243-82510N377879-2 INTERCHANGEABLE
Reactor
National Security Agency
5950-01-574-734520339 INTERCHANGEABLE
Transformer,power
Magnecomp, Inc.
Cross-Reference Index
Part NumberManufacturer
20339 PRIMARY Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val (USA)
Related Parts
2530-01-146-4607INTERCHANGEABLE
BRAKE SHOE SET
4820-01-186-9375INTERCHANGEABLE
VALVE,SAFETY RELIEF
2033914AS51SS
5950-01-243-8251INTERCHANGEABLE
REACTOR
0N377879-2
5950-01-574-7345INTERCHANGEABLE
TRANSFORMER,POWER
20339

Frequently Asked Questions

What is NSN 4820-01-420-1878?

NSN 4820-01-420-1878 is a Seat,valve, manufactured by Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-420-1878?

NSN 4820-01-420-1878 has 1 cross-referenced part number: 20339 (Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val).

What NSN replaces 4820-01-420-1878?

There are 4 known substitutes for 4820-01-420-1878: 2530-01-146-4607, 4820-01-186-9375, 5950-01-243-8251 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20339?

Key specifications for 20339: End Item Identification: AIRCRAFT,AIRLIFTER C-17A A. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com