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12870-18A — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

12870-18A: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, overall_height: 3.062 INCHES NOMINAL IN, special_features: 2 HOLES THRU WALL 180 DEG APART,1.375 IN. DIA IN, style_designator: PLAIN, body_inside_diameter: 11.750 INCHES NOMINAL IN, body_outside_diameter: 13.125 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 4820-00-956-8933, 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
12870-18A
NSN: 4820-00-956-8933
FSC: 4820 — Valves, Nonpowered
CAGE: 91363 — NORRISEAL NORRIS VALUES DIV DBA DOVER CO (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
overall_height3.062 INCHES NOMINAL IN
special_features2 HOLES THRU WALL 180 DEG APART,1.375 IN. DIA IN
style_designatorPLAIN
body_inside_diameter11.750 INCHES NOMINAL IN
body_outside_diameter13.125 INCHES NOMINAL IN
seating_surface_shapeFLAT
NSN4820-00-956-8933
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 12870-18A · 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 OUTSIDE DIAMETER: 13.125 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 11.750 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT3.062 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER13.125 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER11.750 INCHES NOMINAL IN
SPECIAL FEATURES2 HOLES THRU WALL 180 DEG APART,1.375 IN. DIA IN
MATERIALRUBBER SYNTHETIC OVERALL
SEATING SURFACE SHAPEFLAT
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 1
52730A025Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12870-18A?
12870-18A is a SEAT,VALVE.
What parts can replace 12870-18A?
There is 1 known substitute for 12870-18A: 52730A025. Substitute compatibility should be verified for your specific system.
What is the NSN for 12870-18A?
12870-18A is cataloged in the U.S. Government catalog under NSN 4820-00-956-8933. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.