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C2559 — Technical Data Sheet

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— · 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, flange_diameter: 1.219 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, seat_angle_in_deg: 45.000 NOMINAL, under_flange_height: 2.375 INCHES NOMINAL IN, body_inside_diameter: 0.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System under NSN 4820-00-036-1774, 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
C2559
NSN: 4820-00-036-1774
FSC: 4820
CAGE: 75954 — KUNKLE INDUSTRIES INC LONERGAN VALVE DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_diameter1.219 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
seat_angle_in_deg45.000 NOMINAL
under_flange_height2.375 INCHES NOMINAL IN
body_inside_diameter0.750 INCHES NOMINAL IN
body_outside_diameter1.005 INCHES NOMINAL IN
seating_surface_shapeANGULAR
flange_seat_to_disk_end_height0.406 INCHES NOMINAL IN
material_document_and_classificationQQ-S-763,CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-00-036-1774
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: C2559 · 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
•
UNDER FLANGE HEIGHT: 2.375 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: ANGULAR
•
MATERIAL: STEEL OVERALL
•
BODY OUTSIDE DIAMETER: 1.005 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763,CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: PLAIN FLANGED
•
SEAT ANGLE IN DEG: 45.000 NOMINAL
•
BODY INSIDE DIAMETER: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
UNDER FLANGE HEIGHT2.375 INCHES NOMINAL IN
SEATING SURFACE SHAPEANGULAR
MATERIALSTEEL OVERALL
BODY OUTSIDE DIAMETER1.005 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORPLAIN FLANGED
SEAT ANGLE IN DEG45.000 NOMINAL
BODY INSIDE DIAMETER0.750 INCHES NOMINAL IN
FLANGE SEAT TO DISK END HEIGHT0.406 INCHES NOMINAL IN
FLANGE DIAMETER1.219 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
AS4167 TY2CL2STDInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
BLK4132InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
AS4167InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A-A-59282InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
O-C-265InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4132InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C2559?
C2559 is a SEAT,VALVE.
What parts can replace C2559?
There are 18 known substitutes for C2559: AS4167 TY2CL2STD, BLK4132, AS4167 and 15 more. Substitute compatibility should be verified for your specific system.
Is C2559 still available?
C2559 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: September 2026