PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A-49120 PIECE 38Piston,valve

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-207-9905 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-207-9905 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-207-9905. Primary manufacturer part number: A-49120 PIECE 38.
Features
  • Piston,valve — FSC 4820
  • Material Document and Classification: ASTM B-164, CLASS A ASSN STD SINGLE MATERIAL RESPONSE
  • Valve Model Number for Which Designed: 2-1/2H3-1/2 HNB-H
  • Material: COPPER ALLOY
  • Valve Type for Which Designed: RELIEF
  • Valve Design Control Activity: 15187
  • 6 verified cross-references
  • Primary manufacturer: Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy construction
General Description

The Piston,valve, cataloged under National Stock Number 4820-01-207-9905, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 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: Cancelled.

Technical Specifications
ParameterValue
NSN4820-01-207-9905
Primary Part NumberA-49120 PIECE 38
Item NamePiston,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusCANCELLED
Material Document and ClassificationASTM B-164, CLASS A ASSN STD SINGLE MATERIAL RESPONSE
Valve Model Number for Which Designed2-1/2H3-1/2 HNB-H
MaterialCOPPER ALLOY
Valve Type for Which DesignedRELIEF
Valve Design Control Activity15187
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
4820-00-060-8193082791 INTERCHANGEABLE
Seat,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-00-163-1259 INTERCHANGEABLE
Valve,safety Relief
4820-00-410-6001A49148 INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-019-2821A-49148 PIECE 37 INTERCHANGEABLE
Cylinder Assembly,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-046-4700028062 INTERCHANGEABLE
Retainer,disk,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-221-890282001 INTERCHANGEABLE
Retainer,disk,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
3110-01-222-5455A-49148 PIECE 9 INTERCHANGEABLE
Bearing,disk,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-263-9543A-49148 PIECE 18 INTERCHANGEABLE
Set Screw Rod
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-264-1925A-49148 PIECE 23 INTERCHANGEABLE
Stem,fluid Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-264-1926043646 INTERCHANGEABLE
Stem,fluid Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
Cross-Reference Index
Part NumberManufacturer
A-49148 PIECE 38 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
A-49120 PIECE 38 PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
S44476 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
043607 PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
A-49148 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
A-49120 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
Related Parts
4820-00-060-8193INTERCHANGEABLE
SEAT,VALVE
082791
4820-00-163-1259INTERCHANGEABLE
VALVE,SAFETY RELIEF
4820-00-410-6001INTERCHANGEABLE
VALVE,SAFETY RELIEF
A49148
4820-01-019-2821INTERCHANGEABLE
CYLINDER ASSEMBLY,VALVE
A-49148 PIECE 37
4820-01-046-4700INTERCHANGEABLE
RETAINER,DISK,VALVE
028062
4820-01-221-8902INTERCHANGEABLE
RETAINER,DISK,VALVE
82001
3110-01-222-5455INTERCHANGEABLE
BEARING,DISK,VALVE
A-49148 PIECE 9
4820-01-263-9543INTERCHANGEABLE
SET SCREW ROD
A-49148 PIECE 18
4820-01-264-1925INTERCHANGEABLE
STEM,FLUID VALVE
A-49148 PIECE 23
4820-01-264-1926INTERCHANGEABLE
STEM,FLUID VALVE
043646
4820-01-303-2542INTERCHANGEABLE
SLIDE,DIRECTIONAL CONTROL LINEAR
A-49148 PIECE 20

Frequently Asked Questions

What is NSN 4820-01-207-9905?

NSN 4820-01-207-9905 is a Piston,valve, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-01-207-9905?

NSN 4820-01-207-9905 has 6 cross-referenced part numbers: A-49148 PIECE 38 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), A-49120 PIECE 38 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), S44476 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 043607 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), A-49148 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team) and 1 more.

What NSN replaces 4820-01-207-9905?

There are 11 known substitutes for 4820-01-207-9905: 4820-00-060-8193, 4820-00-163-1259, 4820-00-410-6001 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A-49120 PIECE 38?

Key specifications for A-49120 PIECE 38: Material Document and Classification: ASTM B-164, CLASS A ASSN STD SINGLE MATERIAL RESPONSE; Valve Model Number for Which Designed: 2-1/2H3-1/2 HNB-H; Material: COPPER ALLOY; Valve Type for Which Designed: RELIEF. 5 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4820-01-207-9905 still in active supply?

NSN 4820-01-207-9905 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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