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PartsTable / COMPONENT / 18L-590
18L-590 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

VALVE,REGULATING,FLUID PRESSURE. Key specifications include phase: SINGLE LOCATION NOT OTHERWISE SPECIFIED, relay: NOT INCLUDED, body_width: 0.390 INCHES MAXIMUM IN, body_height: 0.085 INCHES MAXIMUM IN, body_length: 0.520 INCHES MAXIMUM IN, input_phase: THREE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-520-5541, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
18L-590
NSN: 4820-01-520-5541
FSC: 4820
CAGE: 96355 — MATHESON CO DIV OF G D SEARLE MEDICAL PRODUCTS (USA)
SPECIFICATIONS
phaseSINGLE LOCATION NOT OTHERWISE SPECIFIED
relayNOT INCLUDED
body_width0.390 INCHES MAXIMUM IN
body_height0.085 INCHES MAXIMUM IN
body_length0.520 INCHES MAXIMUM IN
input_phaseTHREE
circuit_typePARALLEL OR SERIES
float_quantity1
overall_height6.000 INCHES NOMINAL IN
mounting_methodTHREAD
actuation_methodBUOYANCY
frequency_rating60.0 HERTZ NOMINAL LOCATION NOT OTHERWISE SPECIFIED
NSN4820-01-520-5541
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 18L-590 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
19590Interchangeable
interchangeable cross-reference
interchangeable
35565Interchangeable
interchangeable cross-reference
interchangeable
002-008C001Interchangeable
interchangeable cross-reference
interchangeable
X74222Interchangeable
interchangeable cross-reference
interchangeable
X74222 PIECE-81Interchangeable
interchangeable cross-reference
interchangeable
CC6323-111Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18L-590?
18L-590 is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace 18L-590?
There are 10 known substitutes for 18L-590: 19590, 35565, 002-008C001 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18L-590?
18L-590 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-520-5541. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026