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PartsTable / COMPONENT / 050519 ITEM 21
050519 ITEM 21 ✓ 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

The OSCILLATOR,CRYSTAL CONTROLLED is a the manufacturer industrial component. Key specifications include material: STEEL SEAT, special_features: VALVE SIZE 4.00 IN. IN, seating_surface_shape: O-RING.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-229-4210, 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
050519 ITEM 21
NSN: 4820-01-229-4210
FSC: 4820
CAGE: 48422 — WILLIAM POWELL COMPANY, THE DBA POWELL VALVE DIV THE STARFLO CORPORATION (USA)
SPECIFICATIONS
materialSTEEL SEAT
special_featuresVALVE SIZE 4.00 IN. IN
seating_surface_shapeO-RING
NSN4820-01-229-4210
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 050519 ITEM 21 · 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
KEY FEATURES
•
MATERIAL: STEEL SEAT
•
SEATING SURFACE SHAPE: O-RING
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL SEAT
SPECIAL FEATURESVALVE SIZE 4.00 IN. IN
SEATING SURFACE SHAPEO-RING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
104500Interchangeable
interchangeable cross-reference
interchangeable
99036-60Interchangeable
interchangeable cross-reference
interchangeable
AQU4/AInterchangeable
interchangeable cross-reference
interchangeable
MIL-I-27848Interchangeable
interchangeable cross-reference
interchangeable
101000Interchangeable
interchangeable cross-reference
interchangeable
6558176Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 050519 ITEM 21?
050519 ITEM 21 is a OSCILLATOR,CRYSTAL CONTROLLED.
What parts can replace 050519 ITEM 21?
There are 10 known substitutes for 050519 ITEM 21: 104500, 99036-60, AQU4/A and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 050519 ITEM 21?
050519 ITEM 21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-229-4210. 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