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PartsTable / COMPONENT / SD-121 PIECE 28
SD-121 PIECE 28 ✓ 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 NOZZLE,VALVE is a the manufacturer industrial component. Key specifications include special_features: STAINLESS STEEL AISI 304;MAX PSI 300;MAX TEMP 450 DEG F DEGF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-198-2974, 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
SD-121 PIECE 28
NSN: 4820-01-198-2974
FSC: 4820
CAGE: 75954 — KUNKLE INDUSTRIES INC LONERGAN VALVE DIV (USA)
SPECIFICATIONS
special_featuresSTAINLESS STEEL AISI 304;MAX PSI 300;MAX TEMP 450 DEG F DEGF
NSN4820-01-198-2974
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SD-121 PIECE 28 · 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSTAINLESS STEEL AISI 304;MAX PSI 300;MAX TEMP 450 DEG F DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
B24-1Interchangeable
interchangeable cross-reference
interchangeable
SD12-1Interchangeable
interchangeable cross-reference
interchangeable
SD-121 PIECE 25 MODEL D-20KInterchangeable
interchangeable cross-reference
interchangeable
SD-121-3/4IN160T186PSIInterchangeable
interchangeable cross-reference
interchangeable
D20K3X4IN160T186PSIInterchangeable
interchangeable cross-reference
interchangeable
SD-121 PIECE 28 MODEL D-20KInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SD-121 PIECE 28?
SD-121 PIECE 28 is a NOZZLE,VALVE.
What parts can replace SD-121 PIECE 28?
There are 7 known substitutes for SD-121 PIECE 28: B24-1, SD12-1, SD-121 PIECE 25 MODEL D-20K and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SD-121 PIECE 28?
SD-121 PIECE 28 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-198-2974. 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