PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

40734-9 PC NO 33Seat,valve

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-483-9643 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-483-9643 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-483-9643. Primary manufacturer part number: 40734-9 PC NO 33.
Features
  • Seat,valve — FSC 4820
  • Material: STEEL CORROSION RESISTING BODY
  • Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY
  • Seating Surface Shape: FLAT
  • 3 verified cross-references
  • Primary manufacturer: Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Corrosion Resisting Body construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-483-9643, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. 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. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-483-9643
Primary Part Number40734-9 PC NO 33
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusACTIVE
MaterialSTEEL CORROSION RESISTING BODY
Material Document and ClassificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY
Seating Surface ShapeFLAT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
4820-01-483-949840734-9 ASSY 40734-901 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-961640734-9 PC NO 12 INTERCHANGEABLE
Cylinder,piston
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-962940734-9 PC NO 19 INTERCHANGEABLE
Diaphragm,valve,flat
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-964740734-9 PC NO 34 INTERCHANGEABLE
Disk,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
3040-01-483-965340734-9 PC NO 36 INTERCHANGEABLE
Shaft,shouldered
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-971440734-9 PC NO 2 INTERCHANGEABLE
Stem,fluid Valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-971640734-9 PC NO 11 INTERCHANGEABLE
Piston,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-483-971740734-9 PC NO 35 INTERCHANGEABLE
Retainer,disk,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-484-003940734-9 PC NO 7 INTERCHANGEABLE
Seat,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Cross-Reference Index
Part NumberManufacturer
40734-9 PC NO 33 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
1682-00 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40734-9 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
4820-01-483-9498INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40734-9 ASSY 40734-901
4820-01-483-9616INTERCHANGEABLE
CYLINDER,PISTON
40734-9 PC NO 12
4820-01-483-9629INTERCHANGEABLE
DIAPHRAGM,VALVE,FLAT
40734-9 PC NO 19
4820-01-483-9647INTERCHANGEABLE
DISK,VALVE
40734-9 PC NO 34
3040-01-483-9653INTERCHANGEABLE
SHAFT,SHOULDERED
40734-9 PC NO 36
4820-01-483-9714INTERCHANGEABLE
STEM,FLUID VALVE
40734-9 PC NO 2
4820-01-483-9716INTERCHANGEABLE
PISTON,VALVE
40734-9 PC NO 11
4820-01-483-9717INTERCHANGEABLE
RETAINER,DISK,VALVE
40734-9 PC NO 35
4820-01-484-0039INTERCHANGEABLE
SEAT,VALVE
40734-9 PC NO 7

Frequently Asked Questions

What is NSN 4820-01-483-9643?

NSN 4820-01-483-9643 is a Seat,valve, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-483-9643?

NSN 4820-01-483-9643 has 3 cross-referenced part numbers: 40734-9 PC NO 33 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 1682-00 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40734-9 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).

What NSN replaces 4820-01-483-9643?

There are 9 known substitutes for 4820-01-483-9643: 4820-01-483-9498, 4820-01-483-9616, 4820-01-483-9629 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 40734-9 PC NO 33?

Key specifications for 40734-9 PC NO 33: End Item Identification: E/I 1 1/2 INCH TRAC STYLE RA, PILOT OPERATED REDUCING VALUE; W/S TARAWA CLASS LHA IN; Material: STEEL CORROSION RESISTING BODY; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY; Seating Surface Shape: FLAT. 5 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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