PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

121555Disk,valve

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-434-6632 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-434-6632 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-434-6632. Primary manufacturer part number: 121555.
Features
  • Disk,valve — FSC 4820
  • Material: STEEL CORROSION RESISTING
  • Pressure Rating: 1500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
  • Temp Rating: 500.0 FAHRENHEIT NOMINAL DEGF
  • 3 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 Steel Corrosion Resisting construction
General Description

The Disk,valve, cataloged under National Stock Number 4820-01-434-6632, 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 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-434-6632
Primary Part Number121555
Item NameDisk,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusACTIVE
MaterialSTEEL CORROSION RESISTING
Pressure Rating1500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
Temp Rating500.0 FAHRENHEIT NOMINAL DEGF
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
3120-00-376-8643 INTERCHANGEABLE
Bearing,sleeve
5930-01-422-2522120781 INTERCHANGEABLE
Switch Subassembly
Setra Systems, Inc. Dba Gems Sensors
4820-01-434-5344122598 INTERCHANGEABLE
Disk,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-5345122584 INTERCHANGEABLE
Guide,valve Stem
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-5348122599 INTERCHANGEABLE
Retainer,disk,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-5488123760 INTERCHANGEABLE
Stem,fluid Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-6129S75376 INTERCHANGEABLE
Base Assembly,relief Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-6636121393 INTERCHANGEABLE
Guide,valve Stem
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-666077321003 INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-434-7948123365 INTERCHANGEABLE
Stem,fluid Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
Cross-Reference Index
Part NumberManufacturer
DS-G-74893 ITEM 3 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
121555 PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
DS-G-74893 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
Related Parts
3120-00-376-8643INTERCHANGEABLE
BEARING,SLEEVE
5930-01-422-2522INTERCHANGEABLE
SWITCH SUBASSEMBLY
120781
4820-01-434-5344INTERCHANGEABLE
DISK,VALVE
122598
4820-01-434-5345INTERCHANGEABLE
GUIDE,VALVE STEM
122584
4820-01-434-5348INTERCHANGEABLE
RETAINER,DISK,VALVE
122599
4820-01-434-5488INTERCHANGEABLE
STEM,FLUID VALVE
123760
4820-01-434-6129INTERCHANGEABLE
BASE ASSEMBLY,RELIEF VALVE
S75376
4820-01-434-6636INTERCHANGEABLE
GUIDE,VALVE STEM
121393
4820-01-434-6660INTERCHANGEABLE
VALVE,SAFETY RELIEF
77321003
4820-01-434-7948INTERCHANGEABLE
STEM,FLUID VALVE
123365
4820-01-434-7968INTERCHANGEABLE
RETAINER,DISK,VALVE
121556

Frequently Asked Questions

What is NSN 4820-01-434-6632?

NSN 4820-01-434-6632 is a Disk,valve, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-434-6632?

NSN 4820-01-434-6632 has 3 cross-referenced part numbers: DS-G-74893 ITEM 3 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 121555 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), DS-G-74893 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).

What NSN replaces 4820-01-434-6632?

There are 11 known substitutes for 4820-01-434-6632: 3120-00-376-8643, 5930-01-422-2522, 4820-01-434-5344 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 121555?

Key specifications for 121555: End Item Identification: SUPPLY CLASS AOE; Material: STEEL CORROSION RESISTING; Special Features: FOR 0.500 BY 1.000 IN. SAFETY RELIEF VALVE IN; Pressure Rating: 1500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS. 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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