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Technical Data Sheet
PartsTable / COMPONENT / 8668-8-4
8668-8-4 ✓ 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 VALVE,CHECK is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY SEAT, valve_size: 8.000 INCHES IN, flange_shape: ROUND WITH HOLES ALL ENDS, special_features: HINGE PIN MATERIAL NICKEL-COPPER ALLOY; BOLTED BONNET, style_designator: STRAIGHT THRU FLANGED ENDS, nominal_thickness: 0.938 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-148-0087, 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
8668-8-4
NSN: 4820-00-148-0087
FSC: 4820
CAGE: 79342 — WILLIAM E WILLIAMS VALVE CORP (USA)
SPECIFICATIONS
materialNICKEL ALLOY SEAT
valve_size8.000 INCHES IN
flange_shapeROUND WITH HOLES ALL ENDS
special_featuresHINGE PIN MATERIAL NICKEL-COPPER ALLOY; BOLTED BONNET
style_designatorSTRAIGHT THRU FLANGED ENDS
nominal_thickness0.938 INCHES ALL ENDS IN
bolt_hole_quantity8 ALL ENDS
flange_face_designPLAIN ALL ENDS
operating_pressure225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
disk_loading_methodWEIGHT
flow_control_deviceDISK
face_to_face_distance19.500 INCHES IN
NSN4820-00-148-0087
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 8668-8-4 · 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
•
DISK LOADING METHOD: WEIGHT
•
NONDEFINITIVE SPEC/STD DATA: 8 IN SIZE AND A GROUP AND 3 TYPE AND A STYLE AND 3 TRIM AND 150 CLASS IN
•
OPERATING PRESSURE: 225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
•
FLANGE SHAPE: ROUND WITH HOLES ALL ENDS
•
NOMINAL OUTSIDE DIAMETER: 13.500 INCHES ALL ENDS IN
•
FACE TO FACE DISTANCE: 19.500 INCHES IN
•
MEDIA FOR WHICH DESIGNED: STEAM FIRST RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
DISK LOADING METHODWEIGHT
NONDEFINITIVE SPEC/STD DATA8 IN SIZE AND A GROUP AND 3 TYPE AND A STYLE AND 3 TRIM AND 150 CLASS IN
OPERATING PRESSURE225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
FLANGE SHAPEROUND WITH HOLES ALL ENDS
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
NOMINAL OUTSIDE DIAMETER13.500 INCHES ALL ENDS IN
FACE TO FACE DISTANCE19.500 INCHES IN
MEDIA FOR WHICH DESIGNEDSTEAM FIRST RESPONSE
BOLT CIRCLE NOMINAL DIAMETER11.750 INCHES ALL ENDS IN
MATERIALNICKEL ALLOY SEAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
800E1907Interchangeable
interchangeable cross-reference
interchangeable
8668Interchangeable
interchangeable cross-reference
interchangeable
10-8668Interchangeable
interchangeable cross-reference
interchangeable
GC8668Interchangeable
interchangeable cross-reference
interchangeable
FREEZEMISTInterchangeable
interchangeable cross-reference
interchangeable
X-72328 PIECE 32Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8668-8-4?
8668-8-4 is a VALVE,CHECK.
What parts can replace 8668-8-4?
There are 19 known substitutes for 8668-8-4: 800E1907, 8668, 10-8668 and 16 more. Substitute compatibility should be verified for your specific system.
Is 8668-8-4 still available?
8668-8-4 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