PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

7990 PIECE 2Disk,valve

William E Williams Valve Corp · NSN 4820-01-278-8772 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-278-8772 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-278-8772. Primary manufacturer part number: 7990 PIECE 2.
Features
  • Disk,valve — FSC 4820
  • Material: STEEL
  • Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
  • Temp Rating: 500.0 FAHRENHEIT NOMINAL DEGF
  • 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 construction
General Description

The Disk,valve, cataloged under National Stock Number 4820-01-278-8772, 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 3 verified specifications, 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-278-8772
Primary Part Number7990 PIECE 2
Item NameDisk,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWilliam E Williams Valve Corp
StatusACTIVE
MaterialSTEEL
Pressure Rating150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
Temp Rating500.0 FAHRENHEIT NOMINAL DEGF
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
5306-00-147-65157990 INTERCHANGEABLE
Bolt,machine
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
4930-00-222-10737216-4 INTERCHANGEABLE
Pump,lubricant Transfer
The Voto Manufacturers Sales Company Div Voto Manufacturers Sales Co, the
5995-00-258-82947990 INTERCHANGEABLE
Lead,electrical
Centroid, Inc. Dba Centroid Inc
5905-00-434-1686960602-2 INTERCHANGEABLE
Resistor,variable,nonwire Wound,
Raytheon Company Dba Raytheon
2520-00-494-01597349242 INTERCHANGEABLE
Shaft Drive Winch
U S Army Tank Automotive Command Amsta-Im-Mm
6625-00-772-6735 INTERCHANGEABLE
Voltmeter
5998-00-898-72577990 INTERCHANGEABLE
Printed Circuit Board
Drs Signal Solutions, Inc.
4240-01-320-19537000126524 INTERCHANGEABLE
Faceshield,welder
3m Company
6660-01-432-18711A21013H02 INTERCHANGEABLE
Baroswitch
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
5360-01-573-53667990 INTERCHANGEABLE
Spring,helical,extension
O F Mossberg & Sons Inc
Cross-Reference Index
Part NumberManufacturer
7990 William E Williams Valve Corp (USA)
7990 PIECE 2 PRIMARY William E Williams Valve Corp (USA)
15F 2 1/2IN PIECE 2 William E Williams Valve Corp (USA)
Related Parts
5306-00-147-6515INTERCHANGEABLE
BOLT,MACHINE
7990
4930-00-222-1073INTERCHANGEABLE
PUMP,LUBRICANT TRANSFER
7216-4
5995-00-258-8294INTERCHANGEABLE
LEAD,ELECTRICAL
7990
5905-00-434-1686INTERCHANGEABLE
RESISTOR,VARIABLE,NONWIRE WOUND,
960602-2
2520-00-494-0159INTERCHANGEABLE
SHAFT DRIVE WINCH
7349242
6625-00-772-6735INTERCHANGEABLE
VOLTMETER
5998-00-898-7257INTERCHANGEABLE
PRINTED CIRCUIT BOARD
7990
4240-01-320-1953INTERCHANGEABLE
FACESHIELD,WELDER
7000126524
6660-01-432-1871INTERCHANGEABLE
BAROSWITCH
1A21013H02
5360-01-573-5366INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
7990
4240-01-614-7622INTERCHANGEABLE
FILTER,PARTICULATE
7990

Frequently Asked Questions

What is NSN 4820-01-278-8772?

NSN 4820-01-278-8772 is a Disk,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 4820-01-278-8772?

NSN 4820-01-278-8772 has 3 cross-referenced part numbers: 7990 (William E Williams Valve Corp), 7990 PIECE 2 (William E Williams Valve Corp), 15F 2 1/2IN PIECE 2 (William E Williams Valve Corp).

What NSN replaces 4820-01-278-8772?

There are 11 known substitutes for 4820-01-278-8772: 5306-00-147-6515, 4930-00-222-1073, 5995-00-258-8294 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 7990 PIECE 2?

Key specifications for 7990 PIECE 2: Material: STEEL; Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 500.0 FAHRENHEIT NOMINAL DEGF. 3 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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