PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

845-1889587ASSYCF1 1-2INPC4Seat,valve

Naval Ship Systems Command · NSN 4820-01-043-3626 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-043-3626 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-043-3626. Primary manufacturer part number: 845-1889587ASSYCF1 1-2INPC4.
Features
  • Seat,valve — FSC 4820
  • 21 verified cross-references
  • Primary manufacturer: Naval Ship Systems Command
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-043-3626, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Ship Systems Command. This item has 21 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameSeat,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersElectric Boat Corporation Div General Dynamics Electric Boat (CAGE 96169); Naval Ship Systems Command (CAGE 80064); The Walworth Company (CAGE 63686); Naval Sea Systems Command (CAGE 53711); Walworth Co Marine Div (CAGE 90664)
Technical Specifications
ParameterValue
NSN4820-01-043-3626
Primary Part Number845-1889587ASSYCF1 1-2INPC4
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerNaval Ship Systems Command
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
4820-00-433-7044 INTERCHANGEABLE
Seat,valve
5990-00-644-0082 INTERCHANGEABLE
Synchro,differential Receiver
4820-00-871-893554386 INTERCHANGEABLE
Seat,valve
The Walworth Company
4820-00-926-4214 INTERCHANGEABLE
Valve,globe
4820-01-067-365384094-F-940 INTERCHANGEABLE
Disk,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-071-98955160-B1-380 INTERCHANGEABLE
Seat,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-073-58492620-902 ASSYC1-2INPC4 INTERCHANGEABLE
Seat,valve
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-075-6588803-2177934-X7XX-19 INTERCHANGEABLE
Seat,valve
Naval Ship Systems Command
5310-01-087-7113SS845-1889587PC6 1IN INTERCHANGEABLE
Locknut,disk Valve
Naval Ship Systems Command
4730-01-088-448470030854 INTERCHANGEABLE
Packing Nut
The Walworth Company
Cross-Reference Index
Part NumberManufacturer
2620-902 ASSY C Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-1889587ASSYCF Naval Ship Systems Command (USA)
2620-902 The Walworth Company (USA)
845-1889587ASSYCF1 1-2INPC4 PRIMARY Naval Ship Systems Command (USA)
2620-902X2ASSYC1 1-2IN PC20 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
2620-902ASSYCF1 1/2INPC4 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
2620-902ASSYCF1 1/2INPC4 PRIMARY The Walworth Company (USA)
810-2177934-72X-18 Naval Ship Systems Command (USA)
1889581ASSYC 1 Naval Sea Systems Command (USA)
C38479-1-1-2 The Walworth Company (USA)
845-1889581ASSY Naval Sea Systems Command (USA)
2620-902 ASSY CV 1 1/2 PIECE 4 The Walworth Company (USA)
SS845-1889587 Naval Sea Systems Command (USA)
SS845-1889587 Naval Ship Systems Command (USA)
845-1889587PC4, Electric Boat Corporation Div General Dynamics Electric Boat (USA)
803-2177934 Naval Ship Systems Command (USA)
SS845-1889587 ASSY CV PIECE 4 Naval Ship Systems Command (USA)
2620-902X2ASSYC1 1-2IN PC20 The Walworth Company (USA)
300053 Walworth Co Marine Div (USA)
803-2177934-72X-18 Naval Ship Systems Command (USA)
Related Parts
4820-00-433-7044INTERCHANGEABLE
SEAT,VALVE
5990-00-644-0082INTERCHANGEABLE
SYNCHRO,DIFFERENTIAL RECEIVER
4820-00-871-8935INTERCHANGEABLE
SEAT,VALVE
54386
4820-00-926-4214INTERCHANGEABLE
VALVE,GLOBE
4820-01-067-3653INTERCHANGEABLE
DISK,VALVE
84094-F-940
4820-01-071-9895INTERCHANGEABLE
SEAT,VALVE
5160-B1-380
4820-01-073-5849INTERCHANGEABLE
SEAT,VALVE
2620-902 ASSYC1-2INPC4
4820-01-075-6588INTERCHANGEABLE
SEAT,VALVE
803-2177934-X7XX-19
5310-01-087-7113INTERCHANGEABLE
LOCKNUT,DISK VALVE
SS845-1889587PC6 1IN
4730-01-088-4484INTERCHANGEABLE
PACKING NUT
70030854
4820-01-105-3572INTERCHANGEABLE
SEAT,VALVE
51163-F-380
4820-01-113-0783INTERCHANGEABLE
CAP,VALVE
2620-902ASSYB PIECE24 1-2IN

Frequently Asked Questions

What is NSN 4820-01-043-3626?

NSN 4820-01-043-3626 is a Seat,valve, manufactured by Naval Ship Systems Command, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-01-043-3626?

NSN 4820-01-043-3626 has 21 cross-referenced part numbers: 2620-902 ASSY C (Electric Boat Corporation Div General Dynamics Electric Boat), 845-1889587ASSYCF (Naval Ship Systems Command), 2620-902 (The Walworth Company), 845-1889587ASSYCF1 1-2INPC4 (Naval Ship Systems Command), 2620-902X2ASSYC1 1-2IN PC20 (Electric Boat Corporation Div General Dynamics Electric Boat) and 16 more.

What NSN replaces 4820-01-043-3626?

There are 12 known substitutes for 4820-01-043-3626: 4820-00-433-7044, 5990-00-644-0082, 4820-00-871-8935 and 9 more. Verify interchangeability with system specifications before substitution.

Is NSN 4820-01-043-3626 still in active supply?

NSN 4820-01-043-3626 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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