PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

D-1866 PIECE 13 3IN BSeat,valve

Hunt Valve Company Inc Dba Union Flonetics · NSN 4820-01-073-5845 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-073-5845 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-073-5845. Primary manufacturer part number: D-1866 PIECE 13 3IN B.
Features
  • Seat,valve — FSC 4820
  • 6 verified cross-references
  • Primary manufacturer: Hunt Valve Company Inc Dba Union Flonetics
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-073-5845, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hunt Valve Company Inc Dba Union Flonetics. This item has 6 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameSeat,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersHunt Valve Company Inc Dba Union Flonetics (CAGE 34889); Hunt Valve Company, Inc. (CAGE 11859); P J Valves Inc (CAGE 17062)
Technical Specifications
ParameterValue
NSN4820-01-073-5845
Primary Part NumberD-1866 PIECE 13 3IN B
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerHunt Valve Company Inc Dba Union Flonetics
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5945-00-556-33207408089PT7 INTERCHANGEABLE
Relay,thermal
Lockheed Martin Corporation Div Rms
4820-01-073-6391D-1866 PC 3 3IN B INTERCHANGEABLE
Disk,valve
Hunt Valve Company, Inc.
4820-01-090-9722B1486 INTERCHANGEABLE
Disk,valve,metallic
Hunt Valve Company, Inc.
4820-01-091-2839B1885 INTERCHANGEABLE
Seat,valve
Hunt Valve Company, Inc.
4820-01-091-2840D1866 PIECE 13 PT B1884 3IN-A INTERCHANGEABLE
Seat,valve
Hunt Valve Company, Inc.
4820-01-152-0616 INTERCHANGEABLE
Valve,check
5945-01-618-8354 INTERCHANGEABLE
Solenoid,electrical
Cross-Reference Index
Part NumberManufacturer
D-1866 PIECE 13 3IN B Hunt Valve Company Inc Dba Union Flonetics (USA)
D-1866 PIECE 13 3IN B Hunt Valve Company, Inc. (USA)
D1866 PIECE 13 P J Valves Inc (USA)
B1884 P J Valves Inc (USA)
D-1866 PIECE 13 3IN B P J Valves Inc (USA)
D-1866 P J Valves Inc (USA)
Related Parts
5945-00-556-3320INTERCHANGEABLE
RELAY,THERMAL
7408089PT7
4820-01-073-6391INTERCHANGEABLE
DISK,VALVE
D-1866 PC 3 3IN B
4820-01-090-9722INTERCHANGEABLE
DISK,VALVE,METALLIC
B1486
4820-01-091-2839INTERCHANGEABLE
SEAT,VALVE
B1885
4820-01-091-2840INTERCHANGEABLE
SEAT,VALVE
D1866 PIECE 13 PT B1884 3IN-A
4820-01-152-0616INTERCHANGEABLE
VALVE,CHECK
5945-01-618-8354INTERCHANGEABLE
SOLENOID,ELECTRICAL

Frequently Asked Questions

What is NSN 4820-01-073-5845?

NSN 4820-01-073-5845 is a Seat,valve, manufactured by Hunt Valve Company Inc Dba Union Flonetics, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-073-5845?

NSN 4820-01-073-5845 has 6 cross-referenced part numbers: D-1866 PIECE 13 3IN B (Hunt Valve Company Inc Dba Union Flonetics), D-1866 PIECE 13 3IN B (Hunt Valve Company, Inc.), D1866 PIECE 13 (P J Valves Inc), B1884 (P J Valves Inc), D-1866 PIECE 13 3IN B (P J Valves Inc) and 1 more.

What NSN replaces 4820-01-073-5845?

There are 7 known substitutes for 4820-01-073-5845: 5945-00-556-3320, 4820-01-073-6391, 4820-01-090-9722 and 4 more. Verify interchangeability with system specifications before substitution.

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