PartsTable
Technical Data Sheet
99121739 ✓ 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: STEEL OVERALL, flange_shape: ROUND FIRST END, connection_style: PLAIN (TUBE) SECOND END, style_designator: STRAIGHT THRU, nominal_thickness: 0.365 INCHES FIRST END IN, flange_face_design: PLAIN FIRST END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-036-2875, 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
99121739
NSN: 4820-00-036-2875
FSC: 4820
CAGE: 71871 — ALFA LAVAL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_shapeROUND FIRST END
connection_stylePLAIN (TUBE) SECOND END
style_designatorSTRAIGHT THRU
nominal_thickness0.365 INCHES FIRST END IN
flange_face_designPLAIN FIRST END
disk_loading_methodSPRING
flow_control_devicePOPPET
valve_operation_methodAUTOMATIC
nominal_outside_diameter1.000 INCHES FIRST END IN
nominal_outside_diameter_tube_accommodated1.010 INCHES SECOND END IN
NSN4820-00-036-2875
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS SIZE: — · — · — PN: 99121739 · 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
NOMINAL OUTSIDE DIAMETER: 1.000 INCHES FIRST END IN
MATERIAL: STEEL OVERALL
NOMINAL THICKNESS: 0.365 INCHES FIRST END IN
STYLE DESIGNATOR: STRAIGHT THRU
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 1.010 INCHES SECOND END IN
FLANGE FACE DESIGN: PLAIN FIRST END
FLANGE SHAPE: ROUND FIRST END
CONNECTION STYLE: PLAIN (TUBE) SECOND END
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OUTSIDE DIAMETER1.000 INCHES FIRST END IN
MATERIALSTEEL OVERALL
NOMINAL THICKNESS0.365 INCHES FIRST END IN
STYLE DESIGNATORSTRAIGHT THRU
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.010 INCHES SECOND END IN
FLANGE FACE DESIGNPLAIN FIRST END
FLANGE SHAPEROUND FIRST END
CONNECTION STYLEPLAIN (TUBE) SECOND END
DISK LOADING METHODSPRING
FLOW CONTROL DEVICEPOPPET
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
21739Interchangeable
interchangeable cross-reference
interchangeable
1205-0226Interchangeable
interchangeable cross-reference
interchangeable
425226-1Interchangeable
interchangeable cross-reference
interchangeable
74R126Interchangeable
interchangeable cross-reference
interchangeable
317-010255-8Interchangeable
interchangeable cross-reference
interchangeable
C-31-21739Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 99121739?
99121739 is a VALVE,CHECK.
What parts can replace 99121739?
There are 9 known substitutes for 99121739: 21739, 1205-0226, 425226-1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 99121739?
99121739 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-036-2875. This indicates validated use in U.S. government and defense supply chains.
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