PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

45021L6Seat,valve

Circor Aerospace, Inc. Dba Circor Aerospace Inc · NSN 4820-01-237-6224 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-237-6224 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-237-6224. Primary manufacturer part number: 45021L6.
Features
  • Seat,valve — FSC 4820
  • 4 verified cross-references
  • Primary manufacturer: Circor Aerospace, Inc. Dba Circor Aerospace Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-237-6224, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Circor Aerospace, Inc. Dba Circor Aerospace Inc. This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 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)
ManufacturersBivco Valve Co (CAGE 53016); Circor Aerospace, Inc. Dba Circor Aerospace Inc (CAGE 91816)
Technical Specifications
ParameterValue
NSN4820-01-237-6224
Primary Part Number45021L6
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerCircor Aerospace, Inc. Dba Circor Aerospace Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4730-00-278-56475033 INTERCHANGEABLE
Fitting,lubrication
Mcneil Ohio Corp
6220-00-424-15041F5041 INTERCHANGEABLE
Stop Light-Taillight,vehicular
Caterpillar Inc Div Caterpillar Defense
4820-01-237-6165 INTERCHANGEABLE
Valve,check
5330-01-399-190602842 INTERCHANGEABLE
Gasket
Defense Logistics Agency Dba Defense Supply Center Philadelphia
Cross-Reference Index
Part NumberManufacturer
3012B Bivco Valve Co (USA)
0812T Bivco Valve Co (USA)
45021L6 PRIMARY Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA)
3012B ITEM 6 Bivco Valve Co (USA)
Related Parts
4730-00-278-5647INTERCHANGEABLE
FITTING,LUBRICATION
5033
6220-00-424-1504INTERCHANGEABLE
STOP LIGHT-TAILLIGHT,VEHICULAR
1F5041
4820-01-237-6165INTERCHANGEABLE
VALVE,CHECK
5330-01-399-1906INTERCHANGEABLE
GASKET
02842

Frequently Asked Questions

What is NSN 4820-01-237-6224?

NSN 4820-01-237-6224 is a Seat,valve, manufactured by Circor Aerospace, Inc. Dba Circor Aerospace Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-237-6224?

NSN 4820-01-237-6224 has 4 cross-referenced part numbers: 3012B (Bivco Valve Co), 0812T (Bivco Valve Co), 45021L6 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 3012B ITEM 6 (Bivco Valve Co).

What NSN replaces 4820-01-237-6224?

There are 4 known substitutes for 4820-01-237-6224: 4730-00-278-5647, 6220-00-424-1504, 4820-01-237-6165 and 1 more. Verify interchangeability with system specifications before substitution.

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