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Technical Data Sheet
PartsTable / COMPONENT / 1291N-300
1291N-300 ✓ 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: COPPER ALLOY BODY, valve_size: 3.000 INCHES IN, flange_shape: ROUND WITH HOLES ALL ENDS, connection_type: FLANGE ALL ENDS, special_features: SWING CHECK TYPE, style_designator: STRAIGHT THRU FLANGED ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-433-2665, 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
1291N-300
NSN: 4820-01-433-2665
FSC: 4820
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
valve_size3.000 INCHES IN
flange_shapeROUND WITH HOLES ALL ENDS
connection_typeFLANGE ALL ENDS
special_featuresSWING CHECK TYPE
style_designatorSTRAIGHT THRU FLANGED ENDS
mounting_positionHORIZONTAL
nominal_thickness0.750 INCHES ALL ENDS IN
bolt_hole_quantity4 ALL ENDS
flange_face_designPLAIN ALL ENDS
operating_pressure225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS
disk_loading_methodWEIGHT
NSN4820-01-433-2665
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1291N-300 · 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
•
MOUNTING POSITION: HORIZONTAL
•
VALVE OPERATION METHOD: AUTOMATIC
•
MATERIAL: NICKEL ALLOY FLOW CONTROL DEVICE
•
FACE TO FACE DISTANCE: 10.000 INCHES IN
•
FLANGE FACE DESIGN: PLAIN ALL ENDS
•
NOMINAL THICKNESS: 0.750 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
DISK LOADING METHODWEIGHT
MOUNTING POSITIONHORIZONTAL
VALVE OPERATION METHODAUTOMATIC
MATERIALNICKEL ALLOY FLOW CONTROL DEVICE
FACE TO FACE DISTANCE10.000 INCHES IN
MATERIALCOPPER ALLOY BODY
FLANGE FACE DESIGNPLAIN ALL ENDS
NOMINAL THICKNESS0.750 INCHES ALL ENDS IN
MEDIA FOR WHICH DESIGNEDSTEAM FIRST RESPONSE
BOLT CIRCLE NOMINAL DIAMETER6.000 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
12913Interchangeable
interchangeable cross-reference
interchangeable
3817Interchangeable
interchangeable cross-reference
interchangeable
850995Interchangeable
interchangeable cross-reference
interchangeable
1770XDMPC59Interchangeable
interchangeable cross-reference
interchangeable
12749Interchangeable
interchangeable cross-reference
interchangeable
1769XDMPC61Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1291N-300?
1291N-300 is a VALVE,CHECK.
What parts can replace 1291N-300?
There are 13 known substitutes for 1291N-300: 12913, 3817, 850995 and 10 more. Substitute compatibility should be verified for your specific system.
Is 1291N-300 still available?
1291N-300 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