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PartsTable / COMPONENT / SD-121 PIECE 25
SD-121 PIECE 25 ✓ 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 DISK,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, temp_rating: 100.0 FAHRENHEIT MINIMUM AND 475.0 FAHRENHEIT MAXIMUM DEGF, pressure_rating: 275.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS, media_for_which_designed: AIR OR STEAM OR WATER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-198-3150, 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 25
NSN: 4820-01-198-3150
FSC: 4820
CAGE: 75954 — KUNKLE INDUSTRIES INC LONERGAN VALVE DIV (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
temp_rating100.0 FAHRENHEIT MINIMUM AND 475.0 FAHRENHEIT MAXIMUM DEGF
pressure_rating275.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
media_for_which_designedAIR OR STEAM OR WATER
NSN4820-01-198-3150
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SD-121 PIECE 25 · 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
•
MEDIA FOR WHICH DESIGNED: AIR OR STEAM OR WATER
•
TEMP RATING: 100.0 FAHRENHEIT MINIMUM AND 475.0 FAHRENHEIT MAXIMUM DEGF
•
PRESSURE RATING: 275.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS (FLIS)
MEDIA FOR WHICH DESIGNEDAIR OR STEAM OR WATER
TEMP RATING100.0 FAHRENHEIT MINIMUM AND 475.0 FAHRENHEIT MAXIMUM DEGF
PRESSURE RATING275.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
MATERIALSTEEL CORROSION RESISTING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
B24-1Interchangeable
interchangeable cross-reference
interchangeable
SD12-1Interchangeable
interchangeable cross-reference
interchangeable
SD-121 PIECE 28 MODEL D-20KInterchangeable
interchangeable cross-reference
interchangeable
SD-121-3/4IN160T186PSIInterchangeable
interchangeable cross-reference
interchangeable
D20K3X4IN160T186PSIInterchangeable
interchangeable cross-reference
interchangeable
SD-121 PIECE 25 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 25?
SD-121 PIECE 25 is a DISK,VALVE.
What parts can replace SD-121 PIECE 25?
There are 7 known substitutes for SD-121 PIECE 25: B24-1, SD12-1, SD-121 PIECE 28 MODEL D-20K and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SD-121 PIECE 25?
SD-121 PIECE 25 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-198-3150. 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