PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18L-590Valve,regulating,fluid Pressure

Matheson Co Div of G D Searle Medical Products · NSN 4820-01-520-5541 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-520-5541 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-520-5541. Primary manufacturer part number: 18L-590.
Features
  • Valve,regulating,fluid Pressure — FSC 4820
  • 3 verified cross-references
  • Primary manufacturer: Matheson Co Div of G D Searle Medical Products
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-520-5541, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Matheson Co Div of G D Searle Medical Products. This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersMatheson Co Div of G D Searle Medical Products (CAGE 96355)
Technical Specifications
ParameterValue
NSN4820-01-520-5541
Primary Part Number18L-590
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMatheson Co Div of G D Searle Medical Products
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5930-00-078-143619590 INTERCHANGEABLE
Switch,electrical
Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.
5930-00-451-5976002-008C001 INTERCHANGEABLE
Switch,liquid Level
M/j Industries Inc Dba National Control Systems
5945-01-045-121319590 INTERCHANGEABLE
Solenoid,electrical
Clayton Manufacturing Company
4820-01-110-6620 INTERCHANGEABLE
Trip,valve
5962-01-171-5589932905-111 INTERCHANGEABLE
Microcircuit,memory
Raytheon Company Dba Raytheon
5330-01-382-700019590 INTERCHANGEABLE
Parts Kit,seal Replacement,mecha
Liftking Manufacturing Corp
6110-01-383-412219590 INTERCHANGEABLE
Regulator,voltage
Creating Technology Solutions, Llc Dba Technology Research Corp Div Technology Research Corp
Cross-Reference Index
Part NumberManufacturer
19-590 Matheson Co Div of G D Searle Medical Products (USA)
D-REG-4404 Matheson Co Div of G D Searle Medical Products (USA)
18L-590 PRIMARY Matheson Co Div of G D Searle Medical Products (USA)
Related Parts
5930-00-078-1436INTERCHANGEABLE
SWITCH,ELECTRICAL
19590
5930-00-451-5976INTERCHANGEABLE
SWITCH,LIQUID LEVEL
002-008C001
5945-01-045-1213INTERCHANGEABLE
SOLENOID,ELECTRICAL
19590
4820-01-110-6620INTERCHANGEABLE
TRIP,VALVE
5962-01-171-5589INTERCHANGEABLE
MICROCIRCUIT,MEMORY
932905-111
5330-01-382-7000INTERCHANGEABLE
PARTS KIT,SEAL REPLACEMENT,MECHA
19590
6110-01-383-4122INTERCHANGEABLE
REGULATOR,VOLTAGE
19590

Frequently Asked Questions

What is NSN 4820-01-520-5541?

NSN 4820-01-520-5541 is a Valve,regulating,fluid Pressure, manufactured by Matheson Co Div of G D Searle Medical Products, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-520-5541?

NSN 4820-01-520-5541 has 3 cross-referenced part numbers: 19-590 (Matheson Co Div of G D Searle Medical Products), D-REG-4404 (Matheson Co Div of G D Searle Medical Products), 18L-590 (Matheson Co Div of G D Searle Medical Products).

What NSN replaces 4820-01-520-5541?

There are 7 known substitutes for 4820-01-520-5541: 5930-00-078-1436, 5930-00-451-5976, 5945-01-045-1213 and 4 more. Verify interchangeability with system specifications before substitution.

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