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Technical Data Sheet
PartsTable / COMPONENT / 7878 NO 3
7878 NO 3 ✓ 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, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.812 INCHES NOMINAL SINGLE THREADED PORTION IN, overall_height: 1.032 INCHES NOMINAL IN, style_designator: PLAIN THREADED, seat_angle_in_deg: 60.000 NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-127-2595, 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
7878 NO 3
NSN: 4820-01-127-2595
FSC: 4820
CAGE: 79342 — WILLIAM E WILLIAMS VALVE CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.812 INCHES NOMINAL SINGLE THREADED PORTION IN
overall_height1.032 INCHES NOMINAL IN
style_designatorPLAIN THREADED
seat_angle_in_deg60.000 NOMINAL
nominal_thread_size11.000 INCHES SINGLE THREADED PORTION IN
body_inside_diameter9.875 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch12 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
NSN4820-01-127-2595
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 7878 NO 3 · 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
•
BODY INSIDE DIAMETER: 9.875 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UN SINGLE THREADED PORTION
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: PLAIN THREADED
•
SEAT ANGLE IN DEG: 60.000 NOMINAL
•
THREAD LENGTH: 0.812 INCHES NOMINAL SINGLE THREADED PORTION IN
•
NOMINAL THREAD SIZE: 11.000 INCHES SINGLE THREADED PORTION IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER9.875 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUN SINGLE THREADED PORTION
MATERIALSTEEL OVERALL
STYLE DESIGNATORPLAIN THREADED
SEAT ANGLE IN DEG60.000 NOMINAL
THREAD LENGTH0.812 INCHES NOMINAL SINGLE THREADED PORTION IN
NOMINAL THREAD SIZE11.000 INCHES SINGLE THREADED PORTION IN
THREAD CLASS2A SINGLE THREADED PORTION A
OVERALL HEIGHT1.032 INCHES NOMINAL IN
SEATING SURFACE SHAPEANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
A3692Interchangeable
interchangeable cross-reference
interchangeable
33G1714Interchangeable
interchangeable cross-reference
interchangeable
MS35489-16Interchangeable
interchangeable cross-reference
interchangeable
82514S4105-69217H75EEF10794Interchangeable
interchangeable cross-reference
interchangeable
82514S4105-692177PC2Interchangeable
interchangeable cross-reference
interchangeable
72030PC2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7878 NO 3?
7878 NO 3 is a SEAT,VALVE.
What parts can replace 7878 NO 3?
There are 16 known substitutes for 7878 NO 3: A3692, 33G1714, MS35489-16 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7878 NO 3?
7878 NO 3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-127-2595. 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