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PartsTable / COMPONENT / NL173-1ANDNK221-1
NL173-1ANDNK221-1 ✓ 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 material: STEEL OVERALL, end_style: SPRING END,SQUARED BOTH ENDS, coil_quantity: 13 3/4, inside_diameter: 0.691 INCHES NOMINAL IN, style_designator: CYLINDRICAL, spring_free_length: 4.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-678-8522, 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
NL173-1ANDNK221-1
NSN: 4820-00-678-8522
FSC: 4820
CAGE: 93591 — PENTAIR VALVES & CONTROLS US LP DIV FLOW CONTROL US HOLDING CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleSPRING END,SQUARED BOTH ENDS
coil_quantity13 3/4
inside_diameter0.691 INCHES NOMINAL IN
style_designatorCYLINDRICAL
spring_free_length4.000 INCHES NOMINAL IN
spring_solid_length1.350 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
spring_deflection_rate15.870 POUNDS PER INCH NOMINAL LBS
spring_free_outside_diameter0.875 INCHES NOMINAL IN
material_document_and_classificationASTM A313 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
general_characteristics_item_descriptionSTAINLESS STEEL
NSN4820-00-678-8522
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: NL173-1ANDNK221-1 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
S460Interchangeable
interchangeable cross-reference
interchangeable
S9300-461049PC9Interchangeable
interchangeable cross-reference
interchangeable
810-1385901Interchangeable
interchangeable cross-reference
interchangeable
1JA3847H01Interchangeable
interchangeable cross-reference
interchangeable
NL172-1Interchangeable
interchangeable cross-reference
interchangeable
S460PC17A17BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NL173-1ANDNK221-1?
NL173-1ANDNK221-1 is a SEAT,VALVE.
What parts can replace NL173-1ANDNK221-1?
There are 16 known substitutes for NL173-1ANDNK221-1: S460, S9300-461049PC9, 810-1385901 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NL173-1ANDNK221-1?
NL173-1ANDNK221-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-678-8522. 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