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Technical Data Sheet
PartsTable / COMPONENT / 9520-21-1
9520-21-1 ✓ 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 SEAT,VALVE is a the manufacturer industrial component. Key specifications include criticality_code_justification: ZZZY, reference_number_differentiating_characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-308-9890, 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
9520-21-1
NSN: 4820-00-308-9890
FSC: 4820
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
NSN4820-00-308-9890
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 9520-21-1 · 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
•
SEAT ANGLE IN DEG: 12.000 NOMINAL
•
SEATING SURFACE SHAPE: ANGULAR
•
SURFACE TREATMENT: ANODIZE OVERALL
•
MATERIAL: STEEL OVERALL
•
BODY OUTSIDE DIAMETER: 4.182 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 3.700 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE IN DEG12.000 NOMINAL
SEATING SURFACE SHAPEANGULAR
SURFACE TREATMENTANODIZE OVERALL
MATERIALSTEEL OVERALL
BODY OUTSIDE DIAMETER4.182 INCHES NOMINAL IN
OVERALL HEIGHT0.503 INCHES NOMINAL IN
BODY INSIDE DIAMETER3.700 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
605267Interchangeable
interchangeable cross-reference
interchangeable
S4824-322455/3IN PC7Interchangeable
interchangeable cross-reference
interchangeable
803-5001021 P/N 605267Interchangeable
interchangeable cross-reference
interchangeable
F3191930ASL2PC5Interchangeable
Same NIIN cross-reference
interchangeable
N10915SL2PC5Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 9520-21-1?
9520-21-1 is a SEAT,VALVE.
What parts can replace 9520-21-1?
There are 5 known substitutes for 9520-21-1: 605267, S4824-322455/3IN PC7, 803-5001021 P/N 605267 and 2 more. Substitute compatibility should be verified for your specific system.
Is 9520-21-1 still available?
9520-21-1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026