PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

7878 ITEM 3Seat,valve

William E Williams Valve Corp · NSN 4820-01-178-7023 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-178-7023 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-178-7023. Primary manufacturer part number: 7878 ITEM 3.
Features
  • Seat,valve — FSC 4820
  • Material: STEEL CORROSION RESISTING OVERALL
  • 3 verified cross-references
  • Primary manufacturer: William E Williams Valve Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-178-7023, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is William E Williams Valve Corp. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-178-7023
Primary Part Number7878 ITEM 3
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWilliam E Williams Valve Corp
StatusACTIVE
MaterialSTEEL CORROSION RESISTING OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5325-00-276-6089 INTERCHANGEABLE
Grommet,nonmetallic
3120-00-343-25307878 INTERCHANGEABLE
Bearing,sleeve
Cooper Machinery Services Llc
5305-00-477-3268 INTERCHANGEABLE
Setscrew
5950-00-648-6167 INTERCHANGEABLE
Transformer,power
4820-01-124-67827878 ITEM 5 5IN INTERCHANGEABLE
Stem,fluid Valve
William E Williams Valve Corp
4820-01-127-25957878 NO 3 INTERCHANGEABLE
Seat,valve
William E Williams Valve Corp
4820-01-178-30907878 ITEM 5-2IN INTERCHANGEABLE
Stem,fluid Valve
William E Williams Valve Corp
4820-01-182-08267878 ITEM 3 4IN INTERCHANGEABLE
Seat,valve
William E Williams Valve Corp
4820-01-182-16897878-6IN INTERCHANGEABLE
Valve,gate
William E Williams Valve Corp
4820-01-184-42787878 ITEM 3 3 IN INTERCHANGEABLE
Seat,valve
William E Williams Valve Corp
Cross-Reference Index
Part NumberManufacturer
7878 ITEM 3-2IN William E Williams Valve Corp (USA)
7878 William E Williams Valve Corp (USA)
7878 ITEM 3 PRIMARY William E Williams Valve Corp (USA)
Related Parts
5325-00-276-6089INTERCHANGEABLE
GROMMET,NONMETALLIC
3120-00-343-2530INTERCHANGEABLE
BEARING,SLEEVE
7878
5305-00-477-3268INTERCHANGEABLE
SETSCREW
5950-00-648-6167INTERCHANGEABLE
TRANSFORMER,POWER
4820-01-124-6782INTERCHANGEABLE
STEM,FLUID VALVE
7878 ITEM 5 5IN
4820-01-127-2595INTERCHANGEABLE
SEAT,VALVE
7878 NO 3
4820-01-178-3090INTERCHANGEABLE
STEM,FLUID VALVE
7878 ITEM 5-2IN
4820-01-182-0826INTERCHANGEABLE
SEAT,VALVE
7878 ITEM 3 4IN
4820-01-182-1689INTERCHANGEABLE
VALVE,GATE
7878-6IN
4820-01-184-4278INTERCHANGEABLE
SEAT,VALVE
7878 ITEM 3 3 IN
4820-01-210-1393INTERCHANGEABLE
DISK,VALVE
7878 ITEM 2 4IN
4820-01-210-4338INTERCHANGEABLE
STEM,FLUID VALVE
7878 ITEM 5 4IN

Frequently Asked Questions

What is NSN 4820-01-178-7023?

NSN 4820-01-178-7023 is a Seat,valve, manufactured by William E Williams Valve Corp, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-178-7023?

NSN 4820-01-178-7023 has 3 cross-referenced part numbers: 7878 ITEM 3-2IN (William E Williams Valve Corp), 7878 (William E Williams Valve Corp), 7878 ITEM 3 (William E Williams Valve Corp).

What NSN replaces 4820-01-178-7023?

There are 12 known substitutes for 4820-01-178-7023: 5325-00-276-6089, 3120-00-343-2530, 5305-00-477-3268 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 7878 ITEM 3?

Key specifications for 7878 ITEM 3: Material: STEEL CORROSION RESISTING OVERALL. 1 total characteristics are documented in the Federal Logistics Information System.

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