PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

121556Retainer,disk,valve

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-434-7968 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-434-7968 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-434-7968. Primary manufacturer part number: 121556.
Features
  • Retainer,disk,valve — FSC 4820
  • Valve Design Control Activity: 15187
  • Material: STEEL COMP 316
  • Valve Size for Which Designed: 0.500 INCHES IN
  • 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 Comp 316 construction
General Description

The Retainer,disk,valve, cataloged under National Stock Number 4820-01-434-7968, 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
NSN4820-01-434-7968
Primary Part Number121556
Item NameRetainer,disk,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusACTIVE
Valve Design Control Activity15187
MaterialSTEEL COMP 316
Valve Size for Which Designed0.500 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
3120-00-593-2812CS347 INTERCHANGEABLE
Bushing,sleeve
Eaton Corp Dba Eaton Aerospace Jackson
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
4820-01-434-5490125278 INTERCHANGEABLE
Retainer,disk,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
4820-01-434-6632121555 INTERCHANGEABLE
Disk,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
Cross-Reference Index
Part NumberManufacturer
121556 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)
DS-G-74893 ITEM 4 Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
Related Parts
3120-00-593-2812INTERCHANGEABLE
BUSHING,SLEEVE
CS347
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
4820-01-434-5490INTERCHANGEABLE
RETAINER,DISK,VALVE
125278
4820-01-434-6129INTERCHANGEABLE
BASE ASSEMBLY,RELIEF VALVE
S75376
4820-01-434-6632INTERCHANGEABLE
DISK,VALVE
121555
4820-01-434-6636INTERCHANGEABLE
GUIDE,VALVE STEM
121393
4820-01-434-6660INTERCHANGEABLE
VALVE,SAFETY RELIEF
77321003
4820-01-434-7948INTERCHANGEABLE
STEM,FLUID VALVE
123365

Frequently Asked Questions

What is NSN 4820-01-434-7968?

NSN 4820-01-434-7968 is a Retainer,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 4820-01-434-7968?

NSN 4820-01-434-7968 has 3 cross-referenced part numbers: 121556 (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), DS-G-74893 ITEM 4 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).

What NSN replaces 4820-01-434-7968?

There are 11 known substitutes for 4820-01-434-7968: 3120-00-593-2812, 4820-01-434-5344, 4820-01-434-5345 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 121556?

Key specifications for 121556: Valve Design Control Activity: 15187; Special Features: FOR SAFETY RELIEF VALVE SZ 0.500 IN. BY 1.000 IN. IN; Material: STEEL COMP 316; End Item Identification: SUPPLY CLASS AOE. 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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